diff --git a/test/built-ins/Temporal/Calendar/prototype/dateAdd/branding.js b/test/built-ins/Temporal/Calendar/prototype/dateAdd/branding.js
new file mode 100644
index 0000000000..29972471fe
--- /dev/null
+++ b/test/built-ins/Temporal/Calendar/prototype/dateAdd/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.prototype.dateadd
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const dateAdd = Temporal.Calendar.prototype.dateAdd;
+
+assert.sameValue(typeof dateAdd, "function");
+
+assert.throws(TypeError, () => dateAdd.call(undefined), "undefined");
+assert.throws(TypeError, () => dateAdd.call(null), "null");
+assert.throws(TypeError, () => dateAdd.call(true), "true");
+assert.throws(TypeError, () => dateAdd.call(""), "empty string");
+assert.throws(TypeError, () => dateAdd.call(Symbol()), "symbol");
+assert.throws(TypeError, () => dateAdd.call(1), "1");
+assert.throws(TypeError, () => dateAdd.call({}), "plain object");
+assert.throws(TypeError, () => dateAdd.call(Temporal.Calendar), "Temporal.Calendar");
+assert.throws(TypeError, () => dateAdd.call(Temporal.Calendar.prototype), "Temporal.Calendar.prototype");
diff --git a/test/built-ins/Temporal/Calendar/prototype/dateFromFields/branding.js b/test/built-ins/Temporal/Calendar/prototype/dateFromFields/branding.js
new file mode 100644
index 0000000000..bd5250194a
--- /dev/null
+++ b/test/built-ins/Temporal/Calendar/prototype/dateFromFields/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.prototype.datefromfields
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const dateFromFields = Temporal.Calendar.prototype.dateFromFields;
+
+assert.sameValue(typeof dateFromFields, "function");
+
+assert.throws(TypeError, () => dateFromFields.call(undefined), "undefined");
+assert.throws(TypeError, () => dateFromFields.call(null), "null");
+assert.throws(TypeError, () => dateFromFields.call(true), "true");
+assert.throws(TypeError, () => dateFromFields.call(""), "empty string");
+assert.throws(TypeError, () => dateFromFields.call(Symbol()), "symbol");
+assert.throws(TypeError, () => dateFromFields.call(1), "1");
+assert.throws(TypeError, () => dateFromFields.call({}), "plain object");
+assert.throws(TypeError, () => dateFromFields.call(Temporal.Calendar), "Temporal.Calendar");
+assert.throws(TypeError, () => dateFromFields.call(Temporal.Calendar.prototype), "Temporal.Calendar.prototype");
diff --git a/test/built-ins/Temporal/Calendar/prototype/dateUntil/branding.js b/test/built-ins/Temporal/Calendar/prototype/dateUntil/branding.js
new file mode 100644
index 0000000000..b6da8916a3
--- /dev/null
+++ b/test/built-ins/Temporal/Calendar/prototype/dateUntil/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.prototype.dateuntil
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const dateUntil = Temporal.Calendar.prototype.dateUntil;
+
+assert.sameValue(typeof dateUntil, "function");
+
+assert.throws(TypeError, () => dateUntil.call(undefined), "undefined");
+assert.throws(TypeError, () => dateUntil.call(null), "null");
+assert.throws(TypeError, () => dateUntil.call(true), "true");
+assert.throws(TypeError, () => dateUntil.call(""), "empty string");
+assert.throws(TypeError, () => dateUntil.call(Symbol()), "symbol");
+assert.throws(TypeError, () => dateUntil.call(1), "1");
+assert.throws(TypeError, () => dateUntil.call({}), "plain object");
+assert.throws(TypeError, () => dateUntil.call(Temporal.Calendar), "Temporal.Calendar");
+assert.throws(TypeError, () => dateUntil.call(Temporal.Calendar.prototype), "Temporal.Calendar.prototype");
diff --git a/test/built-ins/Temporal/Calendar/prototype/day/branding.js b/test/built-ins/Temporal/Calendar/prototype/day/branding.js
new file mode 100644
index 0000000000..eafea5fcfe
--- /dev/null
+++ b/test/built-ins/Temporal/Calendar/prototype/day/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.prototype.day
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const day = Temporal.Calendar.prototype.day;
+
+assert.sameValue(typeof day, "function");
+
+assert.throws(TypeError, () => day.call(undefined), "undefined");
+assert.throws(TypeError, () => day.call(null), "null");
+assert.throws(TypeError, () => day.call(true), "true");
+assert.throws(TypeError, () => day.call(""), "empty string");
+assert.throws(TypeError, () => day.call(Symbol()), "symbol");
+assert.throws(TypeError, () => day.call(1), "1");
+assert.throws(TypeError, () => day.call({}), "plain object");
+assert.throws(TypeError, () => day.call(Temporal.Calendar), "Temporal.Calendar");
+assert.throws(TypeError, () => day.call(Temporal.Calendar.prototype), "Temporal.Calendar.prototype");
diff --git a/test/built-ins/Temporal/Calendar/prototype/dayOfWeek/branding.js b/test/built-ins/Temporal/Calendar/prototype/dayOfWeek/branding.js
new file mode 100644
index 0000000000..bbcfc7fb25
--- /dev/null
+++ b/test/built-ins/Temporal/Calendar/prototype/dayOfWeek/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.prototype.dayofweek
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const dayOfWeek = Temporal.Calendar.prototype.dayOfWeek;
+
+assert.sameValue(typeof dayOfWeek, "function");
+
+assert.throws(TypeError, () => dayOfWeek.call(undefined), "undefined");
+assert.throws(TypeError, () => dayOfWeek.call(null), "null");
+assert.throws(TypeError, () => dayOfWeek.call(true), "true");
+assert.throws(TypeError, () => dayOfWeek.call(""), "empty string");
+assert.throws(TypeError, () => dayOfWeek.call(Symbol()), "symbol");
+assert.throws(TypeError, () => dayOfWeek.call(1), "1");
+assert.throws(TypeError, () => dayOfWeek.call({}), "plain object");
+assert.throws(TypeError, () => dayOfWeek.call(Temporal.Calendar), "Temporal.Calendar");
+assert.throws(TypeError, () => dayOfWeek.call(Temporal.Calendar.prototype), "Temporal.Calendar.prototype");
diff --git a/test/built-ins/Temporal/Calendar/prototype/dayOfYear/branding.js b/test/built-ins/Temporal/Calendar/prototype/dayOfYear/branding.js
new file mode 100644
index 0000000000..b60323ae65
--- /dev/null
+++ b/test/built-ins/Temporal/Calendar/prototype/dayOfYear/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.prototype.dayofyear
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const dayOfYear = Temporal.Calendar.prototype.dayOfYear;
+
+assert.sameValue(typeof dayOfYear, "function");
+
+assert.throws(TypeError, () => dayOfYear.call(undefined), "undefined");
+assert.throws(TypeError, () => dayOfYear.call(null), "null");
+assert.throws(TypeError, () => dayOfYear.call(true), "true");
+assert.throws(TypeError, () => dayOfYear.call(""), "empty string");
+assert.throws(TypeError, () => dayOfYear.call(Symbol()), "symbol");
+assert.throws(TypeError, () => dayOfYear.call(1), "1");
+assert.throws(TypeError, () => dayOfYear.call({}), "plain object");
+assert.throws(TypeError, () => dayOfYear.call(Temporal.Calendar), "Temporal.Calendar");
+assert.throws(TypeError, () => dayOfYear.call(Temporal.Calendar.prototype), "Temporal.Calendar.prototype");
diff --git a/test/built-ins/Temporal/Calendar/prototype/daysInMonth/branding.js b/test/built-ins/Temporal/Calendar/prototype/daysInMonth/branding.js
new file mode 100644
index 0000000000..84f76e7aaa
--- /dev/null
+++ b/test/built-ins/Temporal/Calendar/prototype/daysInMonth/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.prototype.daysinmonth
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const daysInMonth = Temporal.Calendar.prototype.daysInMonth;
+
+assert.sameValue(typeof daysInMonth, "function");
+
+assert.throws(TypeError, () => daysInMonth.call(undefined), "undefined");
+assert.throws(TypeError, () => daysInMonth.call(null), "null");
+assert.throws(TypeError, () => daysInMonth.call(true), "true");
+assert.throws(TypeError, () => daysInMonth.call(""), "empty string");
+assert.throws(TypeError, () => daysInMonth.call(Symbol()), "symbol");
+assert.throws(TypeError, () => daysInMonth.call(1), "1");
+assert.throws(TypeError, () => daysInMonth.call({}), "plain object");
+assert.throws(TypeError, () => daysInMonth.call(Temporal.Calendar), "Temporal.Calendar");
+assert.throws(TypeError, () => daysInMonth.call(Temporal.Calendar.prototype), "Temporal.Calendar.prototype");
diff --git a/test/built-ins/Temporal/Calendar/prototype/daysInWeek/branding.js b/test/built-ins/Temporal/Calendar/prototype/daysInWeek/branding.js
new file mode 100644
index 0000000000..1d1c859bb5
--- /dev/null
+++ b/test/built-ins/Temporal/Calendar/prototype/daysInWeek/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.prototype.daysinweek
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const daysInWeek = Temporal.Calendar.prototype.daysInWeek;
+
+assert.sameValue(typeof daysInWeek, "function");
+
+assert.throws(TypeError, () => daysInWeek.call(undefined), "undefined");
+assert.throws(TypeError, () => daysInWeek.call(null), "null");
+assert.throws(TypeError, () => daysInWeek.call(true), "true");
+assert.throws(TypeError, () => daysInWeek.call(""), "empty string");
+assert.throws(TypeError, () => daysInWeek.call(Symbol()), "symbol");
+assert.throws(TypeError, () => daysInWeek.call(1), "1");
+assert.throws(TypeError, () => daysInWeek.call({}), "plain object");
+assert.throws(TypeError, () => daysInWeek.call(Temporal.Calendar), "Temporal.Calendar");
+assert.throws(TypeError, () => daysInWeek.call(Temporal.Calendar.prototype), "Temporal.Calendar.prototype");
diff --git a/test/built-ins/Temporal/Calendar/prototype/daysInYear/branding.js b/test/built-ins/Temporal/Calendar/prototype/daysInYear/branding.js
new file mode 100644
index 0000000000..e7bf10dbf6
--- /dev/null
+++ b/test/built-ins/Temporal/Calendar/prototype/daysInYear/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.prototype.daysinyear
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const daysInYear = Temporal.Calendar.prototype.daysInYear;
+
+assert.sameValue(typeof daysInYear, "function");
+
+assert.throws(TypeError, () => daysInYear.call(undefined), "undefined");
+assert.throws(TypeError, () => daysInYear.call(null), "null");
+assert.throws(TypeError, () => daysInYear.call(true), "true");
+assert.throws(TypeError, () => daysInYear.call(""), "empty string");
+assert.throws(TypeError, () => daysInYear.call(Symbol()), "symbol");
+assert.throws(TypeError, () => daysInYear.call(1), "1");
+assert.throws(TypeError, () => daysInYear.call({}), "plain object");
+assert.throws(TypeError, () => daysInYear.call(Temporal.Calendar), "Temporal.Calendar");
+assert.throws(TypeError, () => daysInYear.call(Temporal.Calendar.prototype), "Temporal.Calendar.prototype");
diff --git a/test/built-ins/Temporal/Calendar/prototype/era/branding.js b/test/built-ins/Temporal/Calendar/prototype/era/branding.js
new file mode 100644
index 0000000000..b8b5ed214c
--- /dev/null
+++ b/test/built-ins/Temporal/Calendar/prototype/era/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.prototype.era
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const era = Temporal.Calendar.prototype.era;
+
+assert.sameValue(typeof era, "function");
+
+assert.throws(TypeError, () => era.call(undefined), "undefined");
+assert.throws(TypeError, () => era.call(null), "null");
+assert.throws(TypeError, () => era.call(true), "true");
+assert.throws(TypeError, () => era.call(""), "empty string");
+assert.throws(TypeError, () => era.call(Symbol()), "symbol");
+assert.throws(TypeError, () => era.call(1), "1");
+assert.throws(TypeError, () => era.call({}), "plain object");
+assert.throws(TypeError, () => era.call(Temporal.Calendar), "Temporal.Calendar");
+assert.throws(TypeError, () => era.call(Temporal.Calendar.prototype), "Temporal.Calendar.prototype");
diff --git a/test/built-ins/Temporal/Calendar/prototype/eraYear/branding.js b/test/built-ins/Temporal/Calendar/prototype/eraYear/branding.js
new file mode 100644
index 0000000000..8bd9c313ff
--- /dev/null
+++ b/test/built-ins/Temporal/Calendar/prototype/eraYear/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.prototype.erayear
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const eraYear = Temporal.Calendar.prototype.eraYear;
+
+assert.sameValue(typeof eraYear, "function");
+
+assert.throws(TypeError, () => eraYear.call(undefined), "undefined");
+assert.throws(TypeError, () => eraYear.call(null), "null");
+assert.throws(TypeError, () => eraYear.call(true), "true");
+assert.throws(TypeError, () => eraYear.call(""), "empty string");
+assert.throws(TypeError, () => eraYear.call(Symbol()), "symbol");
+assert.throws(TypeError, () => eraYear.call(1), "1");
+assert.throws(TypeError, () => eraYear.call({}), "plain object");
+assert.throws(TypeError, () => eraYear.call(Temporal.Calendar), "Temporal.Calendar");
+assert.throws(TypeError, () => eraYear.call(Temporal.Calendar.prototype), "Temporal.Calendar.prototype");
diff --git a/test/built-ins/Temporal/Calendar/prototype/fields/branding.js b/test/built-ins/Temporal/Calendar/prototype/fields/branding.js
new file mode 100644
index 0000000000..bd62883331
--- /dev/null
+++ b/test/built-ins/Temporal/Calendar/prototype/fields/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.prototype.fields
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const fields = Temporal.Calendar.prototype.fields;
+
+assert.sameValue(typeof fields, "function");
+
+assert.throws(TypeError, () => fields.call(undefined), "undefined");
+assert.throws(TypeError, () => fields.call(null), "null");
+assert.throws(TypeError, () => fields.call(true), "true");
+assert.throws(TypeError, () => fields.call(""), "empty string");
+assert.throws(TypeError, () => fields.call(Symbol()), "symbol");
+assert.throws(TypeError, () => fields.call(1), "1");
+assert.throws(TypeError, () => fields.call({}), "plain object");
+assert.throws(TypeError, () => fields.call(Temporal.Calendar), "Temporal.Calendar");
+assert.throws(TypeError, () => fields.call(Temporal.Calendar.prototype), "Temporal.Calendar.prototype");
diff --git a/test/built-ins/Temporal/Calendar/prototype/inLeapYear/branding.js b/test/built-ins/Temporal/Calendar/prototype/inLeapYear/branding.js
new file mode 100644
index 0000000000..8b3e5de8a2
--- /dev/null
+++ b/test/built-ins/Temporal/Calendar/prototype/inLeapYear/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.prototype.inleapyear
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const inLeapYear = Temporal.Calendar.prototype.inLeapYear;
+
+assert.sameValue(typeof inLeapYear, "function");
+
+assert.throws(TypeError, () => inLeapYear.call(undefined), "undefined");
+assert.throws(TypeError, () => inLeapYear.call(null), "null");
+assert.throws(TypeError, () => inLeapYear.call(true), "true");
+assert.throws(TypeError, () => inLeapYear.call(""), "empty string");
+assert.throws(TypeError, () => inLeapYear.call(Symbol()), "symbol");
+assert.throws(TypeError, () => inLeapYear.call(1), "1");
+assert.throws(TypeError, () => inLeapYear.call({}), "plain object");
+assert.throws(TypeError, () => inLeapYear.call(Temporal.Calendar), "Temporal.Calendar");
+assert.throws(TypeError, () => inLeapYear.call(Temporal.Calendar.prototype), "Temporal.Calendar.prototype");
diff --git a/test/built-ins/Temporal/Calendar/prototype/mergeFields/branding.js b/test/built-ins/Temporal/Calendar/prototype/mergeFields/branding.js
new file mode 100644
index 0000000000..0ef2b3f84d
--- /dev/null
+++ b/test/built-ins/Temporal/Calendar/prototype/mergeFields/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.prototype.mergefields
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const mergeFields = Temporal.Calendar.prototype.mergeFields;
+
+assert.sameValue(typeof mergeFields, "function");
+
+assert.throws(TypeError, () => mergeFields.call(undefined), "undefined");
+assert.throws(TypeError, () => mergeFields.call(null), "null");
+assert.throws(TypeError, () => mergeFields.call(true), "true");
+assert.throws(TypeError, () => mergeFields.call(""), "empty string");
+assert.throws(TypeError, () => mergeFields.call(Symbol()), "symbol");
+assert.throws(TypeError, () => mergeFields.call(1), "1");
+assert.throws(TypeError, () => mergeFields.call({}), "plain object");
+assert.throws(TypeError, () => mergeFields.call(Temporal.Calendar), "Temporal.Calendar");
+assert.throws(TypeError, () => mergeFields.call(Temporal.Calendar.prototype), "Temporal.Calendar.prototype");
diff --git a/test/built-ins/Temporal/Calendar/prototype/month/branding.js b/test/built-ins/Temporal/Calendar/prototype/month/branding.js
new file mode 100644
index 0000000000..612b047b14
--- /dev/null
+++ b/test/built-ins/Temporal/Calendar/prototype/month/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.prototype.month
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const month = Temporal.Calendar.prototype.month;
+
+assert.sameValue(typeof month, "function");
+
+assert.throws(TypeError, () => month.call(undefined), "undefined");
+assert.throws(TypeError, () => month.call(null), "null");
+assert.throws(TypeError, () => month.call(true), "true");
+assert.throws(TypeError, () => month.call(""), "empty string");
+assert.throws(TypeError, () => month.call(Symbol()), "symbol");
+assert.throws(TypeError, () => month.call(1), "1");
+assert.throws(TypeError, () => month.call({}), "plain object");
+assert.throws(TypeError, () => month.call(Temporal.Calendar), "Temporal.Calendar");
+assert.throws(TypeError, () => month.call(Temporal.Calendar.prototype), "Temporal.Calendar.prototype");
diff --git a/test/built-ins/Temporal/Calendar/prototype/monthCode/branding.js b/test/built-ins/Temporal/Calendar/prototype/monthCode/branding.js
new file mode 100644
index 0000000000..210291345d
--- /dev/null
+++ b/test/built-ins/Temporal/Calendar/prototype/monthCode/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.prototype.monthcode
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const monthCode = Temporal.Calendar.prototype.monthCode;
+
+assert.sameValue(typeof monthCode, "function");
+
+assert.throws(TypeError, () => monthCode.call(undefined), "undefined");
+assert.throws(TypeError, () => monthCode.call(null), "null");
+assert.throws(TypeError, () => monthCode.call(true), "true");
+assert.throws(TypeError, () => monthCode.call(""), "empty string");
+assert.throws(TypeError, () => monthCode.call(Symbol()), "symbol");
+assert.throws(TypeError, () => monthCode.call(1), "1");
+assert.throws(TypeError, () => monthCode.call({}), "plain object");
+assert.throws(TypeError, () => monthCode.call(Temporal.Calendar), "Temporal.Calendar");
+assert.throws(TypeError, () => monthCode.call(Temporal.Calendar.prototype), "Temporal.Calendar.prototype");
diff --git a/test/built-ins/Temporal/Calendar/prototype/monthDayFromFields/branding.js b/test/built-ins/Temporal/Calendar/prototype/monthDayFromFields/branding.js
new file mode 100644
index 0000000000..63691c7c4b
--- /dev/null
+++ b/test/built-ins/Temporal/Calendar/prototype/monthDayFromFields/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.prototype.monthdayfromfields
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const monthDayFromFields = Temporal.Calendar.prototype.monthDayFromFields;
+
+assert.sameValue(typeof monthDayFromFields, "function");
+
+assert.throws(TypeError, () => monthDayFromFields.call(undefined), "undefined");
+assert.throws(TypeError, () => monthDayFromFields.call(null), "null");
+assert.throws(TypeError, () => monthDayFromFields.call(true), "true");
+assert.throws(TypeError, () => monthDayFromFields.call(""), "empty string");
+assert.throws(TypeError, () => monthDayFromFields.call(Symbol()), "symbol");
+assert.throws(TypeError, () => monthDayFromFields.call(1), "1");
+assert.throws(TypeError, () => monthDayFromFields.call({}), "plain object");
+assert.throws(TypeError, () => monthDayFromFields.call(Temporal.Calendar), "Temporal.Calendar");
+assert.throws(TypeError, () => monthDayFromFields.call(Temporal.Calendar.prototype), "Temporal.Calendar.prototype");
diff --git a/test/built-ins/Temporal/Calendar/prototype/monthsInYear/branding.js b/test/built-ins/Temporal/Calendar/prototype/monthsInYear/branding.js
new file mode 100644
index 0000000000..e86c5f50e2
--- /dev/null
+++ b/test/built-ins/Temporal/Calendar/prototype/monthsInYear/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.prototype.monthsinyear
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const monthsInYear = Temporal.Calendar.prototype.monthsInYear;
+
+assert.sameValue(typeof monthsInYear, "function");
+
+assert.throws(TypeError, () => monthsInYear.call(undefined), "undefined");
+assert.throws(TypeError, () => monthsInYear.call(null), "null");
+assert.throws(TypeError, () => monthsInYear.call(true), "true");
+assert.throws(TypeError, () => monthsInYear.call(""), "empty string");
+assert.throws(TypeError, () => monthsInYear.call(Symbol()), "symbol");
+assert.throws(TypeError, () => monthsInYear.call(1), "1");
+assert.throws(TypeError, () => monthsInYear.call({}), "plain object");
+assert.throws(TypeError, () => monthsInYear.call(Temporal.Calendar), "Temporal.Calendar");
+assert.throws(TypeError, () => monthsInYear.call(Temporal.Calendar.prototype), "Temporal.Calendar.prototype");
diff --git a/test/built-ins/Temporal/Calendar/prototype/toString/branding.js b/test/built-ins/Temporal/Calendar/prototype/toString/branding.js
new file mode 100644
index 0000000000..21449e5411
--- /dev/null
+++ b/test/built-ins/Temporal/Calendar/prototype/toString/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.prototype.tostring
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const toString = Temporal.Calendar.prototype.toString;
+
+assert.sameValue(typeof toString, "function");
+
+assert.throws(TypeError, () => toString.call(undefined), "undefined");
+assert.throws(TypeError, () => toString.call(null), "null");
+assert.throws(TypeError, () => toString.call(true), "true");
+assert.throws(TypeError, () => toString.call(""), "empty string");
+assert.throws(TypeError, () => toString.call(Symbol()), "symbol");
+assert.throws(TypeError, () => toString.call(1), "1");
+assert.throws(TypeError, () => toString.call({}), "plain object");
+assert.throws(TypeError, () => toString.call(Temporal.Calendar), "Temporal.Calendar");
+assert.throws(TypeError, () => toString.call(Temporal.Calendar.prototype), "Temporal.Calendar.prototype");
diff --git a/test/built-ins/Temporal/Calendar/prototype/weekOfYear/branding.js b/test/built-ins/Temporal/Calendar/prototype/weekOfYear/branding.js
new file mode 100644
index 0000000000..82f80e27c7
--- /dev/null
+++ b/test/built-ins/Temporal/Calendar/prototype/weekOfYear/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.prototype.weekofyear
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const weekOfYear = Temporal.Calendar.prototype.weekOfYear;
+
+assert.sameValue(typeof weekOfYear, "function");
+
+assert.throws(TypeError, () => weekOfYear.call(undefined), "undefined");
+assert.throws(TypeError, () => weekOfYear.call(null), "null");
+assert.throws(TypeError, () => weekOfYear.call(true), "true");
+assert.throws(TypeError, () => weekOfYear.call(""), "empty string");
+assert.throws(TypeError, () => weekOfYear.call(Symbol()), "symbol");
+assert.throws(TypeError, () => weekOfYear.call(1), "1");
+assert.throws(TypeError, () => weekOfYear.call({}), "plain object");
+assert.throws(TypeError, () => weekOfYear.call(Temporal.Calendar), "Temporal.Calendar");
+assert.throws(TypeError, () => weekOfYear.call(Temporal.Calendar.prototype), "Temporal.Calendar.prototype");
diff --git a/test/built-ins/Temporal/Calendar/prototype/year/branding.js b/test/built-ins/Temporal/Calendar/prototype/year/branding.js
new file mode 100644
index 0000000000..17e9b710ed
--- /dev/null
+++ b/test/built-ins/Temporal/Calendar/prototype/year/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.prototype.year
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const year = Temporal.Calendar.prototype.year;
+
+assert.sameValue(typeof year, "function");
+
+assert.throws(TypeError, () => year.call(undefined), "undefined");
+assert.throws(TypeError, () => year.call(null), "null");
+assert.throws(TypeError, () => year.call(true), "true");
+assert.throws(TypeError, () => year.call(""), "empty string");
+assert.throws(TypeError, () => year.call(Symbol()), "symbol");
+assert.throws(TypeError, () => year.call(1), "1");
+assert.throws(TypeError, () => year.call({}), "plain object");
+assert.throws(TypeError, () => year.call(Temporal.Calendar), "Temporal.Calendar");
+assert.throws(TypeError, () => year.call(Temporal.Calendar.prototype), "Temporal.Calendar.prototype");
diff --git a/test/built-ins/Temporal/Calendar/prototype/yearMonthFromFields/branding.js b/test/built-ins/Temporal/Calendar/prototype/yearMonthFromFields/branding.js
new file mode 100644
index 0000000000..0839394ca9
--- /dev/null
+++ b/test/built-ins/Temporal/Calendar/prototype/yearMonthFromFields/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.prototype.yearmonthfromfields
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const yearMonthFromFields = Temporal.Calendar.prototype.yearMonthFromFields;
+
+assert.sameValue(typeof yearMonthFromFields, "function");
+
+assert.throws(TypeError, () => yearMonthFromFields.call(undefined), "undefined");
+assert.throws(TypeError, () => yearMonthFromFields.call(null), "null");
+assert.throws(TypeError, () => yearMonthFromFields.call(true), "true");
+assert.throws(TypeError, () => yearMonthFromFields.call(""), "empty string");
+assert.throws(TypeError, () => yearMonthFromFields.call(Symbol()), "symbol");
+assert.throws(TypeError, () => yearMonthFromFields.call(1), "1");
+assert.throws(TypeError, () => yearMonthFromFields.call({}), "plain object");
+assert.throws(TypeError, () => yearMonthFromFields.call(Temporal.Calendar), "Temporal.Calendar");
+assert.throws(TypeError, () => yearMonthFromFields.call(Temporal.Calendar.prototype), "Temporal.Calendar.prototype");
diff --git a/test/built-ins/Temporal/Duration/prototype/abs/branding.js b/test/built-ins/Temporal/Duration/prototype/abs/branding.js
new file mode 100644
index 0000000000..cb45cce69d
--- /dev/null
+++ b/test/built-ins/Temporal/Duration/prototype/abs/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.duration.prototype.abs
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const abs = Temporal.Duration.prototype.abs;
+
+assert.sameValue(typeof abs, "function");
+
+assert.throws(TypeError, () => abs.call(undefined), "undefined");
+assert.throws(TypeError, () => abs.call(null), "null");
+assert.throws(TypeError, () => abs.call(true), "true");
+assert.throws(TypeError, () => abs.call(""), "empty string");
+assert.throws(TypeError, () => abs.call(Symbol()), "symbol");
+assert.throws(TypeError, () => abs.call(1), "1");
+assert.throws(TypeError, () => abs.call({}), "plain object");
+assert.throws(TypeError, () => abs.call(Temporal.Duration), "Temporal.Duration");
+assert.throws(TypeError, () => abs.call(Temporal.Duration.prototype), "Temporal.Duration.prototype");
diff --git a/test/built-ins/Temporal/Duration/prototype/add/branding.js b/test/built-ins/Temporal/Duration/prototype/add/branding.js
new file mode 100644
index 0000000000..e311bd44f8
--- /dev/null
+++ b/test/built-ins/Temporal/Duration/prototype/add/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.duration.prototype.add
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const add = Temporal.Duration.prototype.add;
+
+assert.sameValue(typeof add, "function");
+
+assert.throws(TypeError, () => add.call(undefined), "undefined");
+assert.throws(TypeError, () => add.call(null), "null");
+assert.throws(TypeError, () => add.call(true), "true");
+assert.throws(TypeError, () => add.call(""), "empty string");
+assert.throws(TypeError, () => add.call(Symbol()), "symbol");
+assert.throws(TypeError, () => add.call(1), "1");
+assert.throws(TypeError, () => add.call({}), "plain object");
+assert.throws(TypeError, () => add.call(Temporal.Duration), "Temporal.Duration");
+assert.throws(TypeError, () => add.call(Temporal.Duration.prototype), "Temporal.Duration.prototype");
diff --git a/test/built-ins/Temporal/Duration/prototype/blank/branding.js b/test/built-ins/Temporal/Duration/prototype/blank/branding.js
new file mode 100644
index 0000000000..fbfdc4a10c
--- /dev/null
+++ b/test/built-ins/Temporal/Duration/prototype/blank/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.duration.prototype.blank
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const blank = Object.getOwnPropertyDescriptor(Temporal.Duration.prototype, "blank").get;
+
+assert.sameValue(typeof blank, "function");
+
+assert.throws(TypeError, () => blank.call(undefined), "undefined");
+assert.throws(TypeError, () => blank.call(null), "null");
+assert.throws(TypeError, () => blank.call(true), "true");
+assert.throws(TypeError, () => blank.call(""), "empty string");
+assert.throws(TypeError, () => blank.call(Symbol()), "symbol");
+assert.throws(TypeError, () => blank.call(1), "1");
+assert.throws(TypeError, () => blank.call({}), "plain object");
+assert.throws(TypeError, () => blank.call(Temporal.Duration), "Temporal.Duration");
+assert.throws(TypeError, () => blank.call(Temporal.Duration.prototype), "Temporal.Duration.prototype");
diff --git a/test/built-ins/Temporal/Duration/prototype/days/branding.js b/test/built-ins/Temporal/Duration/prototype/days/branding.js
new file mode 100644
index 0000000000..8a55f399a7
--- /dev/null
+++ b/test/built-ins/Temporal/Duration/prototype/days/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.duration.prototype.days
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const days = Object.getOwnPropertyDescriptor(Temporal.Duration.prototype, "days").get;
+
+assert.sameValue(typeof days, "function");
+
+assert.throws(TypeError, () => days.call(undefined), "undefined");
+assert.throws(TypeError, () => days.call(null), "null");
+assert.throws(TypeError, () => days.call(true), "true");
+assert.throws(TypeError, () => days.call(""), "empty string");
+assert.throws(TypeError, () => days.call(Symbol()), "symbol");
+assert.throws(TypeError, () => days.call(1), "1");
+assert.throws(TypeError, () => days.call({}), "plain object");
+assert.throws(TypeError, () => days.call(Temporal.Duration), "Temporal.Duration");
+assert.throws(TypeError, () => days.call(Temporal.Duration.prototype), "Temporal.Duration.prototype");
diff --git a/test/built-ins/Temporal/Duration/prototype/hours/branding.js b/test/built-ins/Temporal/Duration/prototype/hours/branding.js
new file mode 100644
index 0000000000..da72621a1a
--- /dev/null
+++ b/test/built-ins/Temporal/Duration/prototype/hours/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.duration.prototype.hours
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const hours = Object.getOwnPropertyDescriptor(Temporal.Duration.prototype, "hours").get;
+
+assert.sameValue(typeof hours, "function");
+
+assert.throws(TypeError, () => hours.call(undefined), "undefined");
+assert.throws(TypeError, () => hours.call(null), "null");
+assert.throws(TypeError, () => hours.call(true), "true");
+assert.throws(TypeError, () => hours.call(""), "empty string");
+assert.throws(TypeError, () => hours.call(Symbol()), "symbol");
+assert.throws(TypeError, () => hours.call(1), "1");
+assert.throws(TypeError, () => hours.call({}), "plain object");
+assert.throws(TypeError, () => hours.call(Temporal.Duration), "Temporal.Duration");
+assert.throws(TypeError, () => hours.call(Temporal.Duration.prototype), "Temporal.Duration.prototype");
diff --git a/test/built-ins/Temporal/Duration/prototype/microseconds/branding.js b/test/built-ins/Temporal/Duration/prototype/microseconds/branding.js
new file mode 100644
index 0000000000..813670405e
--- /dev/null
+++ b/test/built-ins/Temporal/Duration/prototype/microseconds/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.duration.prototype.microseconds
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const microseconds = Object.getOwnPropertyDescriptor(Temporal.Duration.prototype, "microseconds").get;
+
+assert.sameValue(typeof microseconds, "function");
+
+assert.throws(TypeError, () => microseconds.call(undefined), "undefined");
+assert.throws(TypeError, () => microseconds.call(null), "null");
+assert.throws(TypeError, () => microseconds.call(true), "true");
+assert.throws(TypeError, () => microseconds.call(""), "empty string");
+assert.throws(TypeError, () => microseconds.call(Symbol()), "symbol");
+assert.throws(TypeError, () => microseconds.call(1), "1");
+assert.throws(TypeError, () => microseconds.call({}), "plain object");
+assert.throws(TypeError, () => microseconds.call(Temporal.Duration), "Temporal.Duration");
+assert.throws(TypeError, () => microseconds.call(Temporal.Duration.prototype), "Temporal.Duration.prototype");
diff --git a/test/built-ins/Temporal/Duration/prototype/milliseconds/branding.js b/test/built-ins/Temporal/Duration/prototype/milliseconds/branding.js
new file mode 100644
index 0000000000..28c0242175
--- /dev/null
+++ b/test/built-ins/Temporal/Duration/prototype/milliseconds/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.duration.prototype.milliseconds
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const milliseconds = Object.getOwnPropertyDescriptor(Temporal.Duration.prototype, "milliseconds").get;
+
+assert.sameValue(typeof milliseconds, "function");
+
+assert.throws(TypeError, () => milliseconds.call(undefined), "undefined");
+assert.throws(TypeError, () => milliseconds.call(null), "null");
+assert.throws(TypeError, () => milliseconds.call(true), "true");
+assert.throws(TypeError, () => milliseconds.call(""), "empty string");
+assert.throws(TypeError, () => milliseconds.call(Symbol()), "symbol");
+assert.throws(TypeError, () => milliseconds.call(1), "1");
+assert.throws(TypeError, () => milliseconds.call({}), "plain object");
+assert.throws(TypeError, () => milliseconds.call(Temporal.Duration), "Temporal.Duration");
+assert.throws(TypeError, () => milliseconds.call(Temporal.Duration.prototype), "Temporal.Duration.prototype");
diff --git a/test/built-ins/Temporal/Duration/prototype/minutes/branding.js b/test/built-ins/Temporal/Duration/prototype/minutes/branding.js
new file mode 100644
index 0000000000..fffcd387e9
--- /dev/null
+++ b/test/built-ins/Temporal/Duration/prototype/minutes/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.duration.prototype.minutes
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const minutes = Object.getOwnPropertyDescriptor(Temporal.Duration.prototype, "minutes").get;
+
+assert.sameValue(typeof minutes, "function");
+
+assert.throws(TypeError, () => minutes.call(undefined), "undefined");
+assert.throws(TypeError, () => minutes.call(null), "null");
+assert.throws(TypeError, () => minutes.call(true), "true");
+assert.throws(TypeError, () => minutes.call(""), "empty string");
+assert.throws(TypeError, () => minutes.call(Symbol()), "symbol");
+assert.throws(TypeError, () => minutes.call(1), "1");
+assert.throws(TypeError, () => minutes.call({}), "plain object");
+assert.throws(TypeError, () => minutes.call(Temporal.Duration), "Temporal.Duration");
+assert.throws(TypeError, () => minutes.call(Temporal.Duration.prototype), "Temporal.Duration.prototype");
diff --git a/test/built-ins/Temporal/Duration/prototype/months/branding.js b/test/built-ins/Temporal/Duration/prototype/months/branding.js
new file mode 100644
index 0000000000..cf6030edca
--- /dev/null
+++ b/test/built-ins/Temporal/Duration/prototype/months/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.duration.prototype.months
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const months = Object.getOwnPropertyDescriptor(Temporal.Duration.prototype, "months").get;
+
+assert.sameValue(typeof months, "function");
+
+assert.throws(TypeError, () => months.call(undefined), "undefined");
+assert.throws(TypeError, () => months.call(null), "null");
+assert.throws(TypeError, () => months.call(true), "true");
+assert.throws(TypeError, () => months.call(""), "empty string");
+assert.throws(TypeError, () => months.call(Symbol()), "symbol");
+assert.throws(TypeError, () => months.call(1), "1");
+assert.throws(TypeError, () => months.call({}), "plain object");
+assert.throws(TypeError, () => months.call(Temporal.Duration), "Temporal.Duration");
+assert.throws(TypeError, () => months.call(Temporal.Duration.prototype), "Temporal.Duration.prototype");
diff --git a/test/built-ins/Temporal/Duration/prototype/nanoseconds/branding.js b/test/built-ins/Temporal/Duration/prototype/nanoseconds/branding.js
new file mode 100644
index 0000000000..15b684b183
--- /dev/null
+++ b/test/built-ins/Temporal/Duration/prototype/nanoseconds/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.duration.prototype.nanoseconds
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const nanoseconds = Object.getOwnPropertyDescriptor(Temporal.Duration.prototype, "nanoseconds").get;
+
+assert.sameValue(typeof nanoseconds, "function");
+
+assert.throws(TypeError, () => nanoseconds.call(undefined), "undefined");
+assert.throws(TypeError, () => nanoseconds.call(null), "null");
+assert.throws(TypeError, () => nanoseconds.call(true), "true");
+assert.throws(TypeError, () => nanoseconds.call(""), "empty string");
+assert.throws(TypeError, () => nanoseconds.call(Symbol()), "symbol");
+assert.throws(TypeError, () => nanoseconds.call(1), "1");
+assert.throws(TypeError, () => nanoseconds.call({}), "plain object");
+assert.throws(TypeError, () => nanoseconds.call(Temporal.Duration), "Temporal.Duration");
+assert.throws(TypeError, () => nanoseconds.call(Temporal.Duration.prototype), "Temporal.Duration.prototype");
diff --git a/test/built-ins/Temporal/Duration/prototype/negated/branding.js b/test/built-ins/Temporal/Duration/prototype/negated/branding.js
new file mode 100644
index 0000000000..612dcafb9b
--- /dev/null
+++ b/test/built-ins/Temporal/Duration/prototype/negated/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.duration.prototype.negated
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const negated = Temporal.Duration.prototype.negated;
+
+assert.sameValue(typeof negated, "function");
+
+assert.throws(TypeError, () => negated.call(undefined), "undefined");
+assert.throws(TypeError, () => negated.call(null), "null");
+assert.throws(TypeError, () => negated.call(true), "true");
+assert.throws(TypeError, () => negated.call(""), "empty string");
+assert.throws(TypeError, () => negated.call(Symbol()), "symbol");
+assert.throws(TypeError, () => negated.call(1), "1");
+assert.throws(TypeError, () => negated.call({}), "plain object");
+assert.throws(TypeError, () => negated.call(Temporal.Duration), "Temporal.Duration");
+assert.throws(TypeError, () => negated.call(Temporal.Duration.prototype), "Temporal.Duration.prototype");
diff --git a/test/built-ins/Temporal/Duration/prototype/round/branding.js b/test/built-ins/Temporal/Duration/prototype/round/branding.js
new file mode 100644
index 0000000000..503b77f9bf
--- /dev/null
+++ b/test/built-ins/Temporal/Duration/prototype/round/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.duration.prototype.round
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const round = Temporal.Duration.prototype.round;
+
+assert.sameValue(typeof round, "function");
+
+assert.throws(TypeError, () => round.call(undefined), "undefined");
+assert.throws(TypeError, () => round.call(null), "null");
+assert.throws(TypeError, () => round.call(true), "true");
+assert.throws(TypeError, () => round.call(""), "empty string");
+assert.throws(TypeError, () => round.call(Symbol()), "symbol");
+assert.throws(TypeError, () => round.call(1), "1");
+assert.throws(TypeError, () => round.call({}), "plain object");
+assert.throws(TypeError, () => round.call(Temporal.Duration), "Temporal.Duration");
+assert.throws(TypeError, () => round.call(Temporal.Duration.prototype), "Temporal.Duration.prototype");
diff --git a/test/built-ins/Temporal/Duration/prototype/seconds/branding.js b/test/built-ins/Temporal/Duration/prototype/seconds/branding.js
new file mode 100644
index 0000000000..4cd3ba7827
--- /dev/null
+++ b/test/built-ins/Temporal/Duration/prototype/seconds/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.duration.prototype.seconds
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const seconds = Object.getOwnPropertyDescriptor(Temporal.Duration.prototype, "seconds").get;
+
+assert.sameValue(typeof seconds, "function");
+
+assert.throws(TypeError, () => seconds.call(undefined), "undefined");
+assert.throws(TypeError, () => seconds.call(null), "null");
+assert.throws(TypeError, () => seconds.call(true), "true");
+assert.throws(TypeError, () => seconds.call(""), "empty string");
+assert.throws(TypeError, () => seconds.call(Symbol()), "symbol");
+assert.throws(TypeError, () => seconds.call(1), "1");
+assert.throws(TypeError, () => seconds.call({}), "plain object");
+assert.throws(TypeError, () => seconds.call(Temporal.Duration), "Temporal.Duration");
+assert.throws(TypeError, () => seconds.call(Temporal.Duration.prototype), "Temporal.Duration.prototype");
diff --git a/test/built-ins/Temporal/Duration/prototype/sign/branding.js b/test/built-ins/Temporal/Duration/prototype/sign/branding.js
new file mode 100644
index 0000000000..9da05c7779
--- /dev/null
+++ b/test/built-ins/Temporal/Duration/prototype/sign/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.duration.prototype.sign
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const sign = Object.getOwnPropertyDescriptor(Temporal.Duration.prototype, "sign").get;
+
+assert.sameValue(typeof sign, "function");
+
+assert.throws(TypeError, () => sign.call(undefined), "undefined");
+assert.throws(TypeError, () => sign.call(null), "null");
+assert.throws(TypeError, () => sign.call(true), "true");
+assert.throws(TypeError, () => sign.call(""), "empty string");
+assert.throws(TypeError, () => sign.call(Symbol()), "symbol");
+assert.throws(TypeError, () => sign.call(1), "1");
+assert.throws(TypeError, () => sign.call({}), "plain object");
+assert.throws(TypeError, () => sign.call(Temporal.Duration), "Temporal.Duration");
+assert.throws(TypeError, () => sign.call(Temporal.Duration.prototype), "Temporal.Duration.prototype");
diff --git a/test/built-ins/Temporal/Duration/prototype/subtract/branding.js b/test/built-ins/Temporal/Duration/prototype/subtract/branding.js
new file mode 100644
index 0000000000..e9264d8e6f
--- /dev/null
+++ b/test/built-ins/Temporal/Duration/prototype/subtract/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.duration.prototype.subtract
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const subtract = Temporal.Duration.prototype.subtract;
+
+assert.sameValue(typeof subtract, "function");
+
+assert.throws(TypeError, () => subtract.call(undefined), "undefined");
+assert.throws(TypeError, () => subtract.call(null), "null");
+assert.throws(TypeError, () => subtract.call(true), "true");
+assert.throws(TypeError, () => subtract.call(""), "empty string");
+assert.throws(TypeError, () => subtract.call(Symbol()), "symbol");
+assert.throws(TypeError, () => subtract.call(1), "1");
+assert.throws(TypeError, () => subtract.call({}), "plain object");
+assert.throws(TypeError, () => subtract.call(Temporal.Duration), "Temporal.Duration");
+assert.throws(TypeError, () => subtract.call(Temporal.Duration.prototype), "Temporal.Duration.prototype");
diff --git a/test/built-ins/Temporal/Duration/prototype/toJSON/branding.js b/test/built-ins/Temporal/Duration/prototype/toJSON/branding.js
new file mode 100644
index 0000000000..e44c1d5380
--- /dev/null
+++ b/test/built-ins/Temporal/Duration/prototype/toJSON/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.duration.prototype.tojson
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const toJSON = Temporal.Duration.prototype.toJSON;
+
+assert.sameValue(typeof toJSON, "function");
+
+assert.throws(TypeError, () => toJSON.call(undefined), "undefined");
+assert.throws(TypeError, () => toJSON.call(null), "null");
+assert.throws(TypeError, () => toJSON.call(true), "true");
+assert.throws(TypeError, () => toJSON.call(""), "empty string");
+assert.throws(TypeError, () => toJSON.call(Symbol()), "symbol");
+assert.throws(TypeError, () => toJSON.call(1), "1");
+assert.throws(TypeError, () => toJSON.call({}), "plain object");
+assert.throws(TypeError, () => toJSON.call(Temporal.Duration), "Temporal.Duration");
+assert.throws(TypeError, () => toJSON.call(Temporal.Duration.prototype), "Temporal.Duration.prototype");
diff --git a/test/built-ins/Temporal/Duration/prototype/toLocaleString/branding.js b/test/built-ins/Temporal/Duration/prototype/toLocaleString/branding.js
new file mode 100644
index 0000000000..5bc550e8e3
--- /dev/null
+++ b/test/built-ins/Temporal/Duration/prototype/toLocaleString/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.duration.prototype.tolocalestring
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const toLocaleString = Temporal.Duration.prototype.toLocaleString;
+
+assert.sameValue(typeof toLocaleString, "function");
+
+assert.throws(TypeError, () => toLocaleString.call(undefined), "undefined");
+assert.throws(TypeError, () => toLocaleString.call(null), "null");
+assert.throws(TypeError, () => toLocaleString.call(true), "true");
+assert.throws(TypeError, () => toLocaleString.call(""), "empty string");
+assert.throws(TypeError, () => toLocaleString.call(Symbol()), "symbol");
+assert.throws(TypeError, () => toLocaleString.call(1), "1");
+assert.throws(TypeError, () => toLocaleString.call({}), "plain object");
+assert.throws(TypeError, () => toLocaleString.call(Temporal.Duration), "Temporal.Duration");
+assert.throws(TypeError, () => toLocaleString.call(Temporal.Duration.prototype), "Temporal.Duration.prototype");
diff --git a/test/built-ins/Temporal/Duration/prototype/toString/branding.js b/test/built-ins/Temporal/Duration/prototype/toString/branding.js
new file mode 100644
index 0000000000..3bd82646b2
--- /dev/null
+++ b/test/built-ins/Temporal/Duration/prototype/toString/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.duration.prototype.tostring
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const toString = Temporal.Duration.prototype.toString;
+
+assert.sameValue(typeof toString, "function");
+
+assert.throws(TypeError, () => toString.call(undefined), "undefined");
+assert.throws(TypeError, () => toString.call(null), "null");
+assert.throws(TypeError, () => toString.call(true), "true");
+assert.throws(TypeError, () => toString.call(""), "empty string");
+assert.throws(TypeError, () => toString.call(Symbol()), "symbol");
+assert.throws(TypeError, () => toString.call(1), "1");
+assert.throws(TypeError, () => toString.call({}), "plain object");
+assert.throws(TypeError, () => toString.call(Temporal.Duration), "Temporal.Duration");
+assert.throws(TypeError, () => toString.call(Temporal.Duration.prototype), "Temporal.Duration.prototype");
diff --git a/test/built-ins/Temporal/Duration/prototype/total/branding.js b/test/built-ins/Temporal/Duration/prototype/total/branding.js
new file mode 100644
index 0000000000..a6841b0bce
--- /dev/null
+++ b/test/built-ins/Temporal/Duration/prototype/total/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.duration.prototype.total
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const total = Temporal.Duration.prototype.total;
+
+assert.sameValue(typeof total, "function");
+
+assert.throws(TypeError, () => total.call(undefined), "undefined");
+assert.throws(TypeError, () => total.call(null), "null");
+assert.throws(TypeError, () => total.call(true), "true");
+assert.throws(TypeError, () => total.call(""), "empty string");
+assert.throws(TypeError, () => total.call(Symbol()), "symbol");
+assert.throws(TypeError, () => total.call(1), "1");
+assert.throws(TypeError, () => total.call({}), "plain object");
+assert.throws(TypeError, () => total.call(Temporal.Duration), "Temporal.Duration");
+assert.throws(TypeError, () => total.call(Temporal.Duration.prototype), "Temporal.Duration.prototype");
diff --git a/test/built-ins/Temporal/Duration/prototype/valueOf/branding.js b/test/built-ins/Temporal/Duration/prototype/valueOf/branding.js
new file mode 100644
index 0000000000..a4146cf9f1
--- /dev/null
+++ b/test/built-ins/Temporal/Duration/prototype/valueOf/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.duration.prototype.valueof
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const valueOf = Temporal.Duration.prototype.valueOf;
+
+assert.sameValue(typeof valueOf, "function");
+
+assert.throws(TypeError, () => valueOf.call(undefined), "undefined");
+assert.throws(TypeError, () => valueOf.call(null), "null");
+assert.throws(TypeError, () => valueOf.call(true), "true");
+assert.throws(TypeError, () => valueOf.call(""), "empty string");
+assert.throws(TypeError, () => valueOf.call(Symbol()), "symbol");
+assert.throws(TypeError, () => valueOf.call(1), "1");
+assert.throws(TypeError, () => valueOf.call({}), "plain object");
+assert.throws(TypeError, () => valueOf.call(Temporal.Duration), "Temporal.Duration");
+assert.throws(TypeError, () => valueOf.call(Temporal.Duration.prototype), "Temporal.Duration.prototype");
diff --git a/test/built-ins/Temporal/Duration/prototype/weeks/branding.js b/test/built-ins/Temporal/Duration/prototype/weeks/branding.js
new file mode 100644
index 0000000000..42a837aadf
--- /dev/null
+++ b/test/built-ins/Temporal/Duration/prototype/weeks/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.duration.prototype.weeks
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const weeks = Object.getOwnPropertyDescriptor(Temporal.Duration.prototype, "weeks").get;
+
+assert.sameValue(typeof weeks, "function");
+
+assert.throws(TypeError, () => weeks.call(undefined), "undefined");
+assert.throws(TypeError, () => weeks.call(null), "null");
+assert.throws(TypeError, () => weeks.call(true), "true");
+assert.throws(TypeError, () => weeks.call(""), "empty string");
+assert.throws(TypeError, () => weeks.call(Symbol()), "symbol");
+assert.throws(TypeError, () => weeks.call(1), "1");
+assert.throws(TypeError, () => weeks.call({}), "plain object");
+assert.throws(TypeError, () => weeks.call(Temporal.Duration), "Temporal.Duration");
+assert.throws(TypeError, () => weeks.call(Temporal.Duration.prototype), "Temporal.Duration.prototype");
diff --git a/test/built-ins/Temporal/Duration/prototype/with/branding.js b/test/built-ins/Temporal/Duration/prototype/with/branding.js
new file mode 100644
index 0000000000..2bc9af85bf
--- /dev/null
+++ b/test/built-ins/Temporal/Duration/prototype/with/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.duration.prototype.with
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const with_ = Temporal.Duration.prototype.with;
+
+assert.sameValue(typeof with_, "function");
+
+assert.throws(TypeError, () => with_.call(undefined), "undefined");
+assert.throws(TypeError, () => with_.call(null), "null");
+assert.throws(TypeError, () => with_.call(true), "true");
+assert.throws(TypeError, () => with_.call(""), "empty string");
+assert.throws(TypeError, () => with_.call(Symbol()), "symbol");
+assert.throws(TypeError, () => with_.call(1), "1");
+assert.throws(TypeError, () => with_.call({}), "plain object");
+assert.throws(TypeError, () => with_.call(Temporal.Duration), "Temporal.Duration");
+assert.throws(TypeError, () => with_.call(Temporal.Duration.prototype), "Temporal.Duration.prototype");
diff --git a/test/built-ins/Temporal/Duration/prototype/years/branding.js b/test/built-ins/Temporal/Duration/prototype/years/branding.js
new file mode 100644
index 0000000000..2d95a26327
--- /dev/null
+++ b/test/built-ins/Temporal/Duration/prototype/years/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.duration.prototype.years
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const years = Object.getOwnPropertyDescriptor(Temporal.Duration.prototype, "years").get;
+
+assert.sameValue(typeof years, "function");
+
+assert.throws(TypeError, () => years.call(undefined), "undefined");
+assert.throws(TypeError, () => years.call(null), "null");
+assert.throws(TypeError, () => years.call(true), "true");
+assert.throws(TypeError, () => years.call(""), "empty string");
+assert.throws(TypeError, () => years.call(Symbol()), "symbol");
+assert.throws(TypeError, () => years.call(1), "1");
+assert.throws(TypeError, () => years.call({}), "plain object");
+assert.throws(TypeError, () => years.call(Temporal.Duration), "Temporal.Duration");
+assert.throws(TypeError, () => years.call(Temporal.Duration.prototype), "Temporal.Duration.prototype");
diff --git a/test/built-ins/Temporal/Instant/prototype/add/branding.js b/test/built-ins/Temporal/Instant/prototype/add/branding.js
new file mode 100644
index 0000000000..cb6b1158c6
--- /dev/null
+++ b/test/built-ins/Temporal/Instant/prototype/add/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2020 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.instant.prototype.add
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const add = Temporal.Instant.prototype.add;
+
+assert.sameValue(typeof add, "function");
+
+assert.throws(TypeError, () => add.call(undefined), "undefined");
+assert.throws(TypeError, () => add.call(null), "null");
+assert.throws(TypeError, () => add.call(true), "true");
+assert.throws(TypeError, () => add.call(""), "empty string");
+assert.throws(TypeError, () => add.call(Symbol()), "symbol");
+assert.throws(TypeError, () => add.call(1), "1");
+assert.throws(TypeError, () => add.call({}), "plain object");
+assert.throws(TypeError, () => add.call(Temporal.Instant), "Temporal.Instant");
+assert.throws(TypeError, () => add.call(Temporal.Instant.prototype), "Temporal.Instant.prototype");
diff --git a/test/built-ins/Temporal/Instant/prototype/epochMicroseconds/branding.js b/test/built-ins/Temporal/Instant/prototype/epochMicroseconds/branding.js
new file mode 100644
index 0000000000..654833ba08
--- /dev/null
+++ b/test/built-ins/Temporal/Instant/prototype/epochMicroseconds/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2020 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.instant.prototype.epochmicroseconds
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const epochMicroseconds = Object.getOwnPropertyDescriptor(Temporal.Instant.prototype, "epochMicroseconds").get;
+
+assert.sameValue(typeof epochMicroseconds, "function");
+
+assert.throws(TypeError, () => epochMicroseconds.call(undefined), "undefined");
+assert.throws(TypeError, () => epochMicroseconds.call(null), "null");
+assert.throws(TypeError, () => epochMicroseconds.call(true), "true");
+assert.throws(TypeError, () => epochMicroseconds.call(""), "empty string");
+assert.throws(TypeError, () => epochMicroseconds.call(Symbol()), "symbol");
+assert.throws(TypeError, () => epochMicroseconds.call(1), "1");
+assert.throws(TypeError, () => epochMicroseconds.call({}), "plain object");
+assert.throws(TypeError, () => epochMicroseconds.call(Temporal.Instant), "Temporal.Instant");
+assert.throws(TypeError, () => epochMicroseconds.call(Temporal.Instant.prototype), "Temporal.Instant.prototype");
diff --git a/test/built-ins/Temporal/Instant/prototype/epochMilliseconds/branding.js b/test/built-ins/Temporal/Instant/prototype/epochMilliseconds/branding.js
new file mode 100644
index 0000000000..04188ecd84
--- /dev/null
+++ b/test/built-ins/Temporal/Instant/prototype/epochMilliseconds/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2020 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.instant.prototype.epochmilliseconds
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const epochMilliseconds = Object.getOwnPropertyDescriptor(Temporal.Instant.prototype, "epochMilliseconds").get;
+
+assert.sameValue(typeof epochMilliseconds, "function");
+
+assert.throws(TypeError, () => epochMilliseconds.call(undefined), "undefined");
+assert.throws(TypeError, () => epochMilliseconds.call(null), "null");
+assert.throws(TypeError, () => epochMilliseconds.call(true), "true");
+assert.throws(TypeError, () => epochMilliseconds.call(""), "empty string");
+assert.throws(TypeError, () => epochMilliseconds.call(Symbol()), "symbol");
+assert.throws(TypeError, () => epochMilliseconds.call(1), "1");
+assert.throws(TypeError, () => epochMilliseconds.call({}), "plain object");
+assert.throws(TypeError, () => epochMilliseconds.call(Temporal.Instant), "Temporal.Instant");
+assert.throws(TypeError, () => epochMilliseconds.call(Temporal.Instant.prototype), "Temporal.Instant.prototype");
diff --git a/test/built-ins/Temporal/Instant/prototype/epochNanoseconds/branding.js b/test/built-ins/Temporal/Instant/prototype/epochNanoseconds/branding.js
new file mode 100644
index 0000000000..44d4989ff9
--- /dev/null
+++ b/test/built-ins/Temporal/Instant/prototype/epochNanoseconds/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2020 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.instant.prototype.epochnanoseconds
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const epochNanoseconds = Object.getOwnPropertyDescriptor(Temporal.Instant.prototype, "epochNanoseconds").get;
+
+assert.sameValue(typeof epochNanoseconds, "function");
+
+assert.throws(TypeError, () => epochNanoseconds.call(undefined), "undefined");
+assert.throws(TypeError, () => epochNanoseconds.call(null), "null");
+assert.throws(TypeError, () => epochNanoseconds.call(true), "true");
+assert.throws(TypeError, () => epochNanoseconds.call(""), "empty string");
+assert.throws(TypeError, () => epochNanoseconds.call(Symbol()), "symbol");
+assert.throws(TypeError, () => epochNanoseconds.call(1), "1");
+assert.throws(TypeError, () => epochNanoseconds.call({}), "plain object");
+assert.throws(TypeError, () => epochNanoseconds.call(Temporal.Instant), "Temporal.Instant");
+assert.throws(TypeError, () => epochNanoseconds.call(Temporal.Instant.prototype), "Temporal.Instant.prototype");
diff --git a/test/built-ins/Temporal/Instant/prototype/epochSeconds/branding.js b/test/built-ins/Temporal/Instant/prototype/epochSeconds/branding.js
new file mode 100644
index 0000000000..a6c30b798b
--- /dev/null
+++ b/test/built-ins/Temporal/Instant/prototype/epochSeconds/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2020 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.instant.prototype.epochseconds
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const epochSeconds = Object.getOwnPropertyDescriptor(Temporal.Instant.prototype, "epochSeconds").get;
+
+assert.sameValue(typeof epochSeconds, "function");
+
+assert.throws(TypeError, () => epochSeconds.call(undefined), "undefined");
+assert.throws(TypeError, () => epochSeconds.call(null), "null");
+assert.throws(TypeError, () => epochSeconds.call(true), "true");
+assert.throws(TypeError, () => epochSeconds.call(""), "empty string");
+assert.throws(TypeError, () => epochSeconds.call(Symbol()), "symbol");
+assert.throws(TypeError, () => epochSeconds.call(1), "1");
+assert.throws(TypeError, () => epochSeconds.call({}), "plain object");
+assert.throws(TypeError, () => epochSeconds.call(Temporal.Instant), "Temporal.Instant");
+assert.throws(TypeError, () => epochSeconds.call(Temporal.Instant.prototype), "Temporal.Instant.prototype");
diff --git a/test/built-ins/Temporal/Instant/prototype/equals/branding.js b/test/built-ins/Temporal/Instant/prototype/equals/branding.js
new file mode 100644
index 0000000000..5aafe306d1
--- /dev/null
+++ b/test/built-ins/Temporal/Instant/prototype/equals/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2020 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.instant.prototype.equals
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const equals = Temporal.Instant.prototype.equals;
+
+assert.sameValue(typeof equals, "function");
+
+assert.throws(TypeError, () => equals.call(undefined), "undefined");
+assert.throws(TypeError, () => equals.call(null), "null");
+assert.throws(TypeError, () => equals.call(true), "true");
+assert.throws(TypeError, () => equals.call(""), "empty string");
+assert.throws(TypeError, () => equals.call(Symbol()), "symbol");
+assert.throws(TypeError, () => equals.call(1), "1");
+assert.throws(TypeError, () => equals.call({}), "plain object");
+assert.throws(TypeError, () => equals.call(Temporal.Instant), "Temporal.Instant");
+assert.throws(TypeError, () => equals.call(Temporal.Instant.prototype), "Temporal.Instant.prototype");
diff --git a/test/built-ins/Temporal/Instant/prototype/round/branding.js b/test/built-ins/Temporal/Instant/prototype/round/branding.js
new file mode 100644
index 0000000000..116f31b767
--- /dev/null
+++ b/test/built-ins/Temporal/Instant/prototype/round/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.instant.prototype.round
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const round = Temporal.Instant.prototype.round;
+
+assert.sameValue(typeof round, "function");
+
+assert.throws(TypeError, () => round.call(undefined), "undefined");
+assert.throws(TypeError, () => round.call(null), "null");
+assert.throws(TypeError, () => round.call(true), "true");
+assert.throws(TypeError, () => round.call(""), "empty string");
+assert.throws(TypeError, () => round.call(Symbol()), "symbol");
+assert.throws(TypeError, () => round.call(1), "1");
+assert.throws(TypeError, () => round.call({}), "plain object");
+assert.throws(TypeError, () => round.call(Temporal.Instant), "Temporal.Instant");
+assert.throws(TypeError, () => round.call(Temporal.Instant.prototype), "Temporal.Instant.prototype");
diff --git a/test/built-ins/Temporal/Instant/prototype/since/branding.js b/test/built-ins/Temporal/Instant/prototype/since/branding.js
new file mode 100644
index 0000000000..0716c625d0
--- /dev/null
+++ b/test/built-ins/Temporal/Instant/prototype/since/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2020 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.instant.prototype.since
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const since = Temporal.Instant.prototype.since;
+
+assert.sameValue(typeof since, "function");
+
+assert.throws(TypeError, () => since.call(undefined), "undefined");
+assert.throws(TypeError, () => since.call(null), "null");
+assert.throws(TypeError, () => since.call(true), "true");
+assert.throws(TypeError, () => since.call(""), "empty string");
+assert.throws(TypeError, () => since.call(Symbol()), "symbol");
+assert.throws(TypeError, () => since.call(1), "1");
+assert.throws(TypeError, () => since.call({}), "plain object");
+assert.throws(TypeError, () => since.call(Temporal.Instant), "Temporal.Instant");
+assert.throws(TypeError, () => since.call(Temporal.Instant.prototype), "Temporal.Instant.prototype");
diff --git a/test/built-ins/Temporal/Instant/prototype/subtract/branding.js b/test/built-ins/Temporal/Instant/prototype/subtract/branding.js
new file mode 100644
index 0000000000..d7c307e3f9
--- /dev/null
+++ b/test/built-ins/Temporal/Instant/prototype/subtract/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2020 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.instant.prototype.subtract
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const subtract = Temporal.Instant.prototype.subtract;
+
+assert.sameValue(typeof subtract, "function");
+
+assert.throws(TypeError, () => subtract.call(undefined), "undefined");
+assert.throws(TypeError, () => subtract.call(null), "null");
+assert.throws(TypeError, () => subtract.call(true), "true");
+assert.throws(TypeError, () => subtract.call(""), "empty string");
+assert.throws(TypeError, () => subtract.call(Symbol()), "symbol");
+assert.throws(TypeError, () => subtract.call(1), "1");
+assert.throws(TypeError, () => subtract.call({}), "plain object");
+assert.throws(TypeError, () => subtract.call(Temporal.Instant), "Temporal.Instant");
+assert.throws(TypeError, () => subtract.call(Temporal.Instant.prototype), "Temporal.Instant.prototype");
diff --git a/test/built-ins/Temporal/Instant/prototype/toJSON/branding.js b/test/built-ins/Temporal/Instant/prototype/toJSON/branding.js
new file mode 100644
index 0000000000..be2d3461e7
--- /dev/null
+++ b/test/built-ins/Temporal/Instant/prototype/toJSON/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2020 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.instant.prototype.tojson
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const toJSON = Temporal.Instant.prototype.toJSON;
+
+assert.sameValue(typeof toJSON, "function");
+
+assert.throws(TypeError, () => toJSON.call(undefined), "undefined");
+assert.throws(TypeError, () => toJSON.call(null), "null");
+assert.throws(TypeError, () => toJSON.call(true), "true");
+assert.throws(TypeError, () => toJSON.call(""), "empty string");
+assert.throws(TypeError, () => toJSON.call(Symbol()), "symbol");
+assert.throws(TypeError, () => toJSON.call(1), "1");
+assert.throws(TypeError, () => toJSON.call({}), "plain object");
+assert.throws(TypeError, () => toJSON.call(Temporal.Instant), "Temporal.Instant");
+assert.throws(TypeError, () => toJSON.call(Temporal.Instant.prototype), "Temporal.Instant.prototype");
diff --git a/test/built-ins/Temporal/Instant/prototype/toLocaleString/branding.js b/test/built-ins/Temporal/Instant/prototype/toLocaleString/branding.js
new file mode 100644
index 0000000000..aa3f053759
--- /dev/null
+++ b/test/built-ins/Temporal/Instant/prototype/toLocaleString/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2020 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.instant.prototype.tolocalestring
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const toLocaleString = Temporal.Instant.prototype.toLocaleString;
+
+assert.sameValue(typeof toLocaleString, "function");
+
+assert.throws(TypeError, () => toLocaleString.call(undefined), "undefined");
+assert.throws(TypeError, () => toLocaleString.call(null), "null");
+assert.throws(TypeError, () => toLocaleString.call(true), "true");
+assert.throws(TypeError, () => toLocaleString.call(""), "empty string");
+assert.throws(TypeError, () => toLocaleString.call(Symbol()), "symbol");
+assert.throws(TypeError, () => toLocaleString.call(1), "1");
+assert.throws(TypeError, () => toLocaleString.call({}), "plain object");
+assert.throws(TypeError, () => toLocaleString.call(Temporal.Instant), "Temporal.Instant");
+assert.throws(TypeError, () => toLocaleString.call(Temporal.Instant.prototype), "Temporal.Instant.prototype");
diff --git a/test/built-ins/Temporal/Instant/prototype/toString/branding.js b/test/built-ins/Temporal/Instant/prototype/toString/branding.js
new file mode 100644
index 0000000000..55a72d9a49
--- /dev/null
+++ b/test/built-ins/Temporal/Instant/prototype/toString/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2020 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.instant.prototype.tostring
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const toString = Temporal.Instant.prototype.toString;
+
+assert.sameValue(typeof toString, "function");
+
+assert.throws(TypeError, () => toString.call(undefined), "undefined");
+assert.throws(TypeError, () => toString.call(null), "null");
+assert.throws(TypeError, () => toString.call(true), "true");
+assert.throws(TypeError, () => toString.call(""), "empty string");
+assert.throws(TypeError, () => toString.call(Symbol()), "symbol");
+assert.throws(TypeError, () => toString.call(1), "1");
+assert.throws(TypeError, () => toString.call({}), "plain object");
+assert.throws(TypeError, () => toString.call(Temporal.Instant), "Temporal.Instant");
+assert.throws(TypeError, () => toString.call(Temporal.Instant.prototype), "Temporal.Instant.prototype");
diff --git a/test/built-ins/Temporal/Instant/prototype/toZonedDateTime/branding.js b/test/built-ins/Temporal/Instant/prototype/toZonedDateTime/branding.js
new file mode 100644
index 0000000000..71409a387b
--- /dev/null
+++ b/test/built-ins/Temporal/Instant/prototype/toZonedDateTime/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2020 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.instant.prototype.tozoneddatetime
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const toZonedDateTime = Temporal.Instant.prototype.toZonedDateTime;
+
+assert.sameValue(typeof toZonedDateTime, "function");
+
+assert.throws(TypeError, () => toZonedDateTime.call(undefined), "undefined");
+assert.throws(TypeError, () => toZonedDateTime.call(null), "null");
+assert.throws(TypeError, () => toZonedDateTime.call(true), "true");
+assert.throws(TypeError, () => toZonedDateTime.call(""), "empty string");
+assert.throws(TypeError, () => toZonedDateTime.call(Symbol()), "symbol");
+assert.throws(TypeError, () => toZonedDateTime.call(1), "1");
+assert.throws(TypeError, () => toZonedDateTime.call({}), "plain object");
+assert.throws(TypeError, () => toZonedDateTime.call(Temporal.Instant), "Temporal.Instant");
+assert.throws(TypeError, () => toZonedDateTime.call(Temporal.Instant.prototype), "Temporal.Instant.prototype");
diff --git a/test/built-ins/Temporal/Instant/prototype/toZonedDateTimeISO/branding.js b/test/built-ins/Temporal/Instant/prototype/toZonedDateTimeISO/branding.js
new file mode 100644
index 0000000000..091591a1ce
--- /dev/null
+++ b/test/built-ins/Temporal/Instant/prototype/toZonedDateTimeISO/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.instant.prototype.tozoneddatetimeiso
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const toZonedDateTimeISO = Temporal.Instant.prototype.toZonedDateTimeISO;
+
+assert.sameValue(typeof toZonedDateTimeISO, "function");
+
+assert.throws(TypeError, () => toZonedDateTimeISO.call(undefined), "undefined");
+assert.throws(TypeError, () => toZonedDateTimeISO.call(null), "null");
+assert.throws(TypeError, () => toZonedDateTimeISO.call(true), "true");
+assert.throws(TypeError, () => toZonedDateTimeISO.call(""), "empty string");
+assert.throws(TypeError, () => toZonedDateTimeISO.call(Symbol()), "symbol");
+assert.throws(TypeError, () => toZonedDateTimeISO.call(1), "1");
+assert.throws(TypeError, () => toZonedDateTimeISO.call({}), "plain object");
+assert.throws(TypeError, () => toZonedDateTimeISO.call(Temporal.Instant), "Temporal.Instant");
+assert.throws(TypeError, () => toZonedDateTimeISO.call(Temporal.Instant.prototype), "Temporal.Instant.prototype");
diff --git a/test/built-ins/Temporal/Instant/prototype/until/branding.js b/test/built-ins/Temporal/Instant/prototype/until/branding.js
new file mode 100644
index 0000000000..70fb066c5e
--- /dev/null
+++ b/test/built-ins/Temporal/Instant/prototype/until/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.instant.prototype.until
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const until = Temporal.Instant.prototype.until;
+
+assert.sameValue(typeof until, "function");
+
+assert.throws(TypeError, () => until.call(undefined), "undefined");
+assert.throws(TypeError, () => until.call(null), "null");
+assert.throws(TypeError, () => until.call(true), "true");
+assert.throws(TypeError, () => until.call(""), "empty string");
+assert.throws(TypeError, () => until.call(Symbol()), "symbol");
+assert.throws(TypeError, () => until.call(1), "1");
+assert.throws(TypeError, () => until.call({}), "plain object");
+assert.throws(TypeError, () => until.call(Temporal.Instant), "Temporal.Instant");
+assert.throws(TypeError, () => until.call(Temporal.Instant.prototype), "Temporal.Instant.prototype");
diff --git a/test/built-ins/Temporal/Instant/prototype/valueOf/branding.js b/test/built-ins/Temporal/Instant/prototype/valueOf/branding.js
new file mode 100644
index 0000000000..4fc03e390e
--- /dev/null
+++ b/test/built-ins/Temporal/Instant/prototype/valueOf/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.instant.prototype.valueof
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const valueOf = Temporal.Instant.prototype.valueOf;
+
+assert.sameValue(typeof valueOf, "function");
+
+assert.throws(TypeError, () => valueOf.call(undefined), "undefined");
+assert.throws(TypeError, () => valueOf.call(null), "null");
+assert.throws(TypeError, () => valueOf.call(true), "true");
+assert.throws(TypeError, () => valueOf.call(""), "empty string");
+assert.throws(TypeError, () => valueOf.call(Symbol()), "symbol");
+assert.throws(TypeError, () => valueOf.call(1), "1");
+assert.throws(TypeError, () => valueOf.call({}), "plain object");
+assert.throws(TypeError, () => valueOf.call(Temporal.Instant), "Temporal.Instant");
+assert.throws(TypeError, () => valueOf.call(Temporal.Instant.prototype), "Temporal.Instant.prototype");
diff --git a/test/built-ins/Temporal/PlainDate/prototype/add/branding.js b/test/built-ins/Temporal/PlainDate/prototype/add/branding.js
new file mode 100644
index 0000000000..b60ec44d51
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDate/prototype/add/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2020 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaindate.prototype.add
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const add = Temporal.PlainDate.prototype.add;
+
+assert.sameValue(typeof add, "function");
+
+assert.throws(TypeError, () => add.call(undefined), "undefined");
+assert.throws(TypeError, () => add.call(null), "null");
+assert.throws(TypeError, () => add.call(true), "true");
+assert.throws(TypeError, () => add.call(""), "empty string");
+assert.throws(TypeError, () => add.call(Symbol()), "symbol");
+assert.throws(TypeError, () => add.call(1), "1");
+assert.throws(TypeError, () => add.call({}), "plain object");
+assert.throws(TypeError, () => add.call(Temporal.PlainDate), "Temporal.PlainDate");
+assert.throws(TypeError, () => add.call(Temporal.PlainDate.prototype), "Temporal.PlainDate.prototype");
diff --git a/test/built-ins/Temporal/PlainDate/prototype/calendar/branding.js b/test/built-ins/Temporal/PlainDate/prototype/calendar/branding.js
new file mode 100644
index 0000000000..fc28805d6a
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDate/prototype/calendar/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.plaindate.prototype.calendar
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const calendar = Object.getOwnPropertyDescriptor(Temporal.PlainDate.prototype, "calendar").get;
+
+assert.sameValue(typeof calendar, "function");
+
+assert.throws(TypeError, () => calendar.call(undefined), "undefined");
+assert.throws(TypeError, () => calendar.call(null), "null");
+assert.throws(TypeError, () => calendar.call(true), "true");
+assert.throws(TypeError, () => calendar.call(""), "empty string");
+assert.throws(TypeError, () => calendar.call(Symbol()), "symbol");
+assert.throws(TypeError, () => calendar.call(1), "1");
+assert.throws(TypeError, () => calendar.call({}), "plain object");
+assert.throws(TypeError, () => calendar.call(Temporal.PlainDate), "Temporal.PlainDate");
+assert.throws(TypeError, () => calendar.call(Temporal.PlainDate.prototype), "Temporal.PlainDate.prototype");
diff --git a/test/built-ins/Temporal/PlainDate/prototype/day/branding.js b/test/built-ins/Temporal/PlainDate/prototype/day/branding.js
new file mode 100644
index 0000000000..39e71bd0be
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDate/prototype/day/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2020 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.plaindate.prototype.day
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const day = Object.getOwnPropertyDescriptor(Temporal.PlainDate.prototype, "day").get;
+
+assert.sameValue(typeof day, "function");
+
+assert.throws(TypeError, () => day.call(undefined), "undefined");
+assert.throws(TypeError, () => day.call(null), "null");
+assert.throws(TypeError, () => day.call(true), "true");
+assert.throws(TypeError, () => day.call(""), "empty string");
+assert.throws(TypeError, () => day.call(Symbol()), "symbol");
+assert.throws(TypeError, () => day.call(1), "1");
+assert.throws(TypeError, () => day.call({}), "plain object");
+assert.throws(TypeError, () => day.call(Temporal.PlainDate), "Temporal.PlainDate");
+assert.throws(TypeError, () => day.call(Temporal.PlainDate.prototype), "Temporal.PlainDate.prototype");
diff --git a/test/built-ins/Temporal/PlainDate/prototype/dayOfWeek/branding.js b/test/built-ins/Temporal/PlainDate/prototype/dayOfWeek/branding.js
new file mode 100644
index 0000000000..f88ab596c6
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDate/prototype/dayOfWeek/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2020 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.plaindate.prototype.dayofweek
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const dayOfWeek = Object.getOwnPropertyDescriptor(Temporal.PlainDate.prototype, "dayOfWeek").get;
+
+assert.sameValue(typeof dayOfWeek, "function");
+
+assert.throws(TypeError, () => dayOfWeek.call(undefined), "undefined");
+assert.throws(TypeError, () => dayOfWeek.call(null), "null");
+assert.throws(TypeError, () => dayOfWeek.call(true), "true");
+assert.throws(TypeError, () => dayOfWeek.call(""), "empty string");
+assert.throws(TypeError, () => dayOfWeek.call(Symbol()), "symbol");
+assert.throws(TypeError, () => dayOfWeek.call(1), "1");
+assert.throws(TypeError, () => dayOfWeek.call({}), "plain object");
+assert.throws(TypeError, () => dayOfWeek.call(Temporal.PlainDate), "Temporal.PlainDate");
+assert.throws(TypeError, () => dayOfWeek.call(Temporal.PlainDate.prototype), "Temporal.PlainDate.prototype");
diff --git a/test/built-ins/Temporal/PlainDate/prototype/dayOfYear/branding.js b/test/built-ins/Temporal/PlainDate/prototype/dayOfYear/branding.js
new file mode 100644
index 0000000000..5bf0aed3f6
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDate/prototype/dayOfYear/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2020 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.plaindate.prototype.dayofyear
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const dayOfYear = Object.getOwnPropertyDescriptor(Temporal.PlainDate.prototype, "dayOfYear").get;
+
+assert.sameValue(typeof dayOfYear, "function");
+
+assert.throws(TypeError, () => dayOfYear.call(undefined), "undefined");
+assert.throws(TypeError, () => dayOfYear.call(null), "null");
+assert.throws(TypeError, () => dayOfYear.call(true), "true");
+assert.throws(TypeError, () => dayOfYear.call(""), "empty string");
+assert.throws(TypeError, () => dayOfYear.call(Symbol()), "symbol");
+assert.throws(TypeError, () => dayOfYear.call(1), "1");
+assert.throws(TypeError, () => dayOfYear.call({}), "plain object");
+assert.throws(TypeError, () => dayOfYear.call(Temporal.PlainDate), "Temporal.PlainDate");
+assert.throws(TypeError, () => dayOfYear.call(Temporal.PlainDate.prototype), "Temporal.PlainDate.prototype");
diff --git a/test/built-ins/Temporal/PlainDate/prototype/daysInMonth/branding.js b/test/built-ins/Temporal/PlainDate/prototype/daysInMonth/branding.js
new file mode 100644
index 0000000000..d4568d927c
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDate/prototype/daysInMonth/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2020 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.plaindate.prototype.daysinmonth
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const daysInMonth = Object.getOwnPropertyDescriptor(Temporal.PlainDate.prototype, "daysInMonth").get;
+
+assert.sameValue(typeof daysInMonth, "function");
+
+assert.throws(TypeError, () => daysInMonth.call(undefined), "undefined");
+assert.throws(TypeError, () => daysInMonth.call(null), "null");
+assert.throws(TypeError, () => daysInMonth.call(true), "true");
+assert.throws(TypeError, () => daysInMonth.call(""), "empty string");
+assert.throws(TypeError, () => daysInMonth.call(Symbol()), "symbol");
+assert.throws(TypeError, () => daysInMonth.call(1), "1");
+assert.throws(TypeError, () => daysInMonth.call({}), "plain object");
+assert.throws(TypeError, () => daysInMonth.call(Temporal.PlainDate), "Temporal.PlainDate");
+assert.throws(TypeError, () => daysInMonth.call(Temporal.PlainDate.prototype), "Temporal.PlainDate.prototype");
diff --git a/test/built-ins/Temporal/PlainDate/prototype/daysInWeek/branding.js b/test/built-ins/Temporal/PlainDate/prototype/daysInWeek/branding.js
new file mode 100644
index 0000000000..873b9c86e9
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDate/prototype/daysInWeek/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2020 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.plaindate.prototype.daysinweek
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const daysInWeek = Object.getOwnPropertyDescriptor(Temporal.PlainDate.prototype, "daysInWeek").get;
+
+assert.sameValue(typeof daysInWeek, "function");
+
+assert.throws(TypeError, () => daysInWeek.call(undefined), "undefined");
+assert.throws(TypeError, () => daysInWeek.call(null), "null");
+assert.throws(TypeError, () => daysInWeek.call(true), "true");
+assert.throws(TypeError, () => daysInWeek.call(""), "empty string");
+assert.throws(TypeError, () => daysInWeek.call(Symbol()), "symbol");
+assert.throws(TypeError, () => daysInWeek.call(1), "1");
+assert.throws(TypeError, () => daysInWeek.call({}), "plain object");
+assert.throws(TypeError, () => daysInWeek.call(Temporal.PlainDate), "Temporal.PlainDate");
+assert.throws(TypeError, () => daysInWeek.call(Temporal.PlainDate.prototype), "Temporal.PlainDate.prototype");
diff --git a/test/built-ins/Temporal/PlainDate/prototype/daysInYear/branding.js b/test/built-ins/Temporal/PlainDate/prototype/daysInYear/branding.js
new file mode 100644
index 0000000000..7752f95159
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDate/prototype/daysInYear/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2020 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.plaindate.prototype.daysinyear
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const daysInYear = Object.getOwnPropertyDescriptor(Temporal.PlainDate.prototype, "daysInYear").get;
+
+assert.sameValue(typeof daysInYear, "function");
+
+assert.throws(TypeError, () => daysInYear.call(undefined), "undefined");
+assert.throws(TypeError, () => daysInYear.call(null), "null");
+assert.throws(TypeError, () => daysInYear.call(true), "true");
+assert.throws(TypeError, () => daysInYear.call(""), "empty string");
+assert.throws(TypeError, () => daysInYear.call(Symbol()), "symbol");
+assert.throws(TypeError, () => daysInYear.call(1), "1");
+assert.throws(TypeError, () => daysInYear.call({}), "plain object");
+assert.throws(TypeError, () => daysInYear.call(Temporal.PlainDate), "Temporal.PlainDate");
+assert.throws(TypeError, () => daysInYear.call(Temporal.PlainDate.prototype), "Temporal.PlainDate.prototype");
diff --git a/test/built-ins/Temporal/PlainDate/prototype/equals/branding.js b/test/built-ins/Temporal/PlainDate/prototype/equals/branding.js
new file mode 100644
index 0000000000..58c78e622f
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDate/prototype/equals/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2020 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaindate.prototype.equals
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const equals = Temporal.PlainDate.prototype.equals;
+
+assert.sameValue(typeof equals, "function");
+
+assert.throws(TypeError, () => equals.call(undefined), "undefined");
+assert.throws(TypeError, () => equals.call(null), "null");
+assert.throws(TypeError, () => equals.call(true), "true");
+assert.throws(TypeError, () => equals.call(""), "empty string");
+assert.throws(TypeError, () => equals.call(Symbol()), "symbol");
+assert.throws(TypeError, () => equals.call(1), "1");
+assert.throws(TypeError, () => equals.call({}), "plain object");
+assert.throws(TypeError, () => equals.call(Temporal.PlainDate), "Temporal.PlainDate");
+assert.throws(TypeError, () => equals.call(Temporal.PlainDate.prototype), "Temporal.PlainDate.prototype");
diff --git a/test/built-ins/Temporal/PlainDate/prototype/era/branding.js b/test/built-ins/Temporal/PlainDate/prototype/era/branding.js
new file mode 100644
index 0000000000..c0f33337d3
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDate/prototype/era/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.plaindate.prototype.era
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const era = Object.getOwnPropertyDescriptor(Temporal.PlainDate.prototype, "era").get;
+
+assert.sameValue(typeof era, "function");
+
+assert.throws(TypeError, () => era.call(undefined), "undefined");
+assert.throws(TypeError, () => era.call(null), "null");
+assert.throws(TypeError, () => era.call(true), "true");
+assert.throws(TypeError, () => era.call(""), "empty string");
+assert.throws(TypeError, () => era.call(Symbol()), "symbol");
+assert.throws(TypeError, () => era.call(1), "1");
+assert.throws(TypeError, () => era.call({}), "plain object");
+assert.throws(TypeError, () => era.call(Temporal.PlainDate), "Temporal.PlainDate");
+assert.throws(TypeError, () => era.call(Temporal.PlainDate.prototype), "Temporal.PlainDate.prototype");
diff --git a/test/built-ins/Temporal/PlainDate/prototype/eraYear/branding.js b/test/built-ins/Temporal/PlainDate/prototype/eraYear/branding.js
new file mode 100644
index 0000000000..0b370869c7
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDate/prototype/eraYear/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.plaindate.prototype.erayear
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const eraYear = Object.getOwnPropertyDescriptor(Temporal.PlainDate.prototype, "eraYear").get;
+
+assert.sameValue(typeof eraYear, "function");
+
+assert.throws(TypeError, () => eraYear.call(undefined), "undefined");
+assert.throws(TypeError, () => eraYear.call(null), "null");
+assert.throws(TypeError, () => eraYear.call(true), "true");
+assert.throws(TypeError, () => eraYear.call(""), "empty string");
+assert.throws(TypeError, () => eraYear.call(Symbol()), "symbol");
+assert.throws(TypeError, () => eraYear.call(1), "1");
+assert.throws(TypeError, () => eraYear.call({}), "plain object");
+assert.throws(TypeError, () => eraYear.call(Temporal.PlainDate), "Temporal.PlainDate");
+assert.throws(TypeError, () => eraYear.call(Temporal.PlainDate.prototype), "Temporal.PlainDate.prototype");
diff --git a/test/built-ins/Temporal/PlainDate/prototype/getISOFields/branding.js b/test/built-ins/Temporal/PlainDate/prototype/getISOFields/branding.js
new file mode 100644
index 0000000000..f24b13c225
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDate/prototype/getISOFields/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2020 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaindate.prototype.getisofields
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const getISOFields = Temporal.PlainDate.prototype.getISOFields;
+
+assert.sameValue(typeof getISOFields, "function");
+
+assert.throws(TypeError, () => getISOFields.call(undefined), "undefined");
+assert.throws(TypeError, () => getISOFields.call(null), "null");
+assert.throws(TypeError, () => getISOFields.call(true), "true");
+assert.throws(TypeError, () => getISOFields.call(""), "empty string");
+assert.throws(TypeError, () => getISOFields.call(Symbol()), "symbol");
+assert.throws(TypeError, () => getISOFields.call(1), "1");
+assert.throws(TypeError, () => getISOFields.call({}), "plain object");
+assert.throws(TypeError, () => getISOFields.call(Temporal.PlainDate), "Temporal.PlainDate");
+assert.throws(TypeError, () => getISOFields.call(Temporal.PlainDate.prototype), "Temporal.PlainDate.prototype");
diff --git a/test/built-ins/Temporal/PlainDate/prototype/inLeapYear/branding.js b/test/built-ins/Temporal/PlainDate/prototype/inLeapYear/branding.js
new file mode 100644
index 0000000000..88345ea8a1
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDate/prototype/inLeapYear/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2020 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.plaindate.prototype.inleapyear
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const inLeapYear = Object.getOwnPropertyDescriptor(Temporal.PlainDate.prototype, "inLeapYear").get;
+
+assert.sameValue(typeof inLeapYear, "function");
+
+assert.throws(TypeError, () => inLeapYear.call(undefined), "undefined");
+assert.throws(TypeError, () => inLeapYear.call(null), "null");
+assert.throws(TypeError, () => inLeapYear.call(true), "true");
+assert.throws(TypeError, () => inLeapYear.call(""), "empty string");
+assert.throws(TypeError, () => inLeapYear.call(Symbol()), "symbol");
+assert.throws(TypeError, () => inLeapYear.call(1), "1");
+assert.throws(TypeError, () => inLeapYear.call({}), "plain object");
+assert.throws(TypeError, () => inLeapYear.call(Temporal.PlainDate), "Temporal.PlainDate");
+assert.throws(TypeError, () => inLeapYear.call(Temporal.PlainDate.prototype), "Temporal.PlainDate.prototype");
diff --git a/test/built-ins/Temporal/PlainDate/prototype/month/branding.js b/test/built-ins/Temporal/PlainDate/prototype/month/branding.js
new file mode 100644
index 0000000000..625e88e93b
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDate/prototype/month/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2020 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.plaindate.prototype.month
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const month = Object.getOwnPropertyDescriptor(Temporal.PlainDate.prototype, "month").get;
+
+assert.sameValue(typeof month, "function");
+
+assert.throws(TypeError, () => month.call(undefined), "undefined");
+assert.throws(TypeError, () => month.call(null), "null");
+assert.throws(TypeError, () => month.call(true), "true");
+assert.throws(TypeError, () => month.call(""), "empty string");
+assert.throws(TypeError, () => month.call(Symbol()), "symbol");
+assert.throws(TypeError, () => month.call(1), "1");
+assert.throws(TypeError, () => month.call({}), "plain object");
+assert.throws(TypeError, () => month.call(Temporal.PlainDate), "Temporal.PlainDate");
+assert.throws(TypeError, () => month.call(Temporal.PlainDate.prototype), "Temporal.PlainDate.prototype");
diff --git a/test/built-ins/Temporal/PlainDate/prototype/monthCode/branding.js b/test/built-ins/Temporal/PlainDate/prototype/monthCode/branding.js
new file mode 100644
index 0000000000..225adefef9
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDate/prototype/monthCode/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.plaindate.prototype.monthcode
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const monthCode = Object.getOwnPropertyDescriptor(Temporal.PlainDate.prototype, "monthCode").get;
+
+assert.sameValue(typeof monthCode, "function");
+
+assert.throws(TypeError, () => monthCode.call(undefined), "undefined");
+assert.throws(TypeError, () => monthCode.call(null), "null");
+assert.throws(TypeError, () => monthCode.call(true), "true");
+assert.throws(TypeError, () => monthCode.call(""), "empty string");
+assert.throws(TypeError, () => monthCode.call(Symbol()), "symbol");
+assert.throws(TypeError, () => monthCode.call(1), "1");
+assert.throws(TypeError, () => monthCode.call({}), "plain object");
+assert.throws(TypeError, () => monthCode.call(Temporal.PlainDate), "Temporal.PlainDate");
+assert.throws(TypeError, () => monthCode.call(Temporal.PlainDate.prototype), "Temporal.PlainDate.prototype");
diff --git a/test/built-ins/Temporal/PlainDate/prototype/monthsInYear/branding.js b/test/built-ins/Temporal/PlainDate/prototype/monthsInYear/branding.js
new file mode 100644
index 0000000000..163d5b4581
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDate/prototype/monthsInYear/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2020 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.plaindate.prototype.monthsinyear
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const monthsInYear = Object.getOwnPropertyDescriptor(Temporal.PlainDate.prototype, "monthsInYear").get;
+
+assert.sameValue(typeof monthsInYear, "function");
+
+assert.throws(TypeError, () => monthsInYear.call(undefined), "undefined");
+assert.throws(TypeError, () => monthsInYear.call(null), "null");
+assert.throws(TypeError, () => monthsInYear.call(true), "true");
+assert.throws(TypeError, () => monthsInYear.call(""), "empty string");
+assert.throws(TypeError, () => monthsInYear.call(Symbol()), "symbol");
+assert.throws(TypeError, () => monthsInYear.call(1), "1");
+assert.throws(TypeError, () => monthsInYear.call({}), "plain object");
+assert.throws(TypeError, () => monthsInYear.call(Temporal.PlainDate), "Temporal.PlainDate");
+assert.throws(TypeError, () => monthsInYear.call(Temporal.PlainDate.prototype), "Temporal.PlainDate.prototype");
diff --git a/test/built-ins/Temporal/PlainDate/prototype/since/branding.js b/test/built-ins/Temporal/PlainDate/prototype/since/branding.js
new file mode 100644
index 0000000000..7b7ea57483
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDate/prototype/since/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2020 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaindate.prototype.since
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const since = Temporal.PlainDate.prototype.since;
+
+assert.sameValue(typeof since, "function");
+
+assert.throws(TypeError, () => since.call(undefined), "undefined");
+assert.throws(TypeError, () => since.call(null), "null");
+assert.throws(TypeError, () => since.call(true), "true");
+assert.throws(TypeError, () => since.call(""), "empty string");
+assert.throws(TypeError, () => since.call(Symbol()), "symbol");
+assert.throws(TypeError, () => since.call(1), "1");
+assert.throws(TypeError, () => since.call({}), "plain object");
+assert.throws(TypeError, () => since.call(Temporal.PlainDate), "Temporal.PlainDate");
+assert.throws(TypeError, () => since.call(Temporal.PlainDate.prototype), "Temporal.PlainDate.prototype");
diff --git a/test/built-ins/Temporal/PlainDate/prototype/subtract/branding.js b/test/built-ins/Temporal/PlainDate/prototype/subtract/branding.js
new file mode 100644
index 0000000000..fb89bca42b
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDate/prototype/subtract/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2020 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaindate.prototype.subtract
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const subtract = Temporal.PlainDate.prototype.subtract;
+
+assert.sameValue(typeof subtract, "function");
+
+assert.throws(TypeError, () => subtract.call(undefined), "undefined");
+assert.throws(TypeError, () => subtract.call(null), "null");
+assert.throws(TypeError, () => subtract.call(true), "true");
+assert.throws(TypeError, () => subtract.call(""), "empty string");
+assert.throws(TypeError, () => subtract.call(Symbol()), "symbol");
+assert.throws(TypeError, () => subtract.call(1), "1");
+assert.throws(TypeError, () => subtract.call({}), "plain object");
+assert.throws(TypeError, () => subtract.call(Temporal.PlainDate), "Temporal.PlainDate");
+assert.throws(TypeError, () => subtract.call(Temporal.PlainDate.prototype), "Temporal.PlainDate.prototype");
diff --git a/test/built-ins/Temporal/PlainDate/prototype/toJSON/branding.js b/test/built-ins/Temporal/PlainDate/prototype/toJSON/branding.js
new file mode 100644
index 0000000000..c384ffedbe
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDate/prototype/toJSON/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2020 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaindate.prototype.tojson
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const toJSON = Temporal.PlainDate.prototype.toJSON;
+
+assert.sameValue(typeof toJSON, "function");
+
+assert.throws(TypeError, () => toJSON.call(undefined), "undefined");
+assert.throws(TypeError, () => toJSON.call(null), "null");
+assert.throws(TypeError, () => toJSON.call(true), "true");
+assert.throws(TypeError, () => toJSON.call(""), "empty string");
+assert.throws(TypeError, () => toJSON.call(Symbol()), "symbol");
+assert.throws(TypeError, () => toJSON.call(1), "1");
+assert.throws(TypeError, () => toJSON.call({}), "plain object");
+assert.throws(TypeError, () => toJSON.call(Temporal.PlainDate), "Temporal.PlainDate");
+assert.throws(TypeError, () => toJSON.call(Temporal.PlainDate.prototype), "Temporal.PlainDate.prototype");
diff --git a/test/built-ins/Temporal/PlainDate/prototype/toLocaleString/branding.js b/test/built-ins/Temporal/PlainDate/prototype/toLocaleString/branding.js
new file mode 100644
index 0000000000..8dc444a6da
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDate/prototype/toLocaleString/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2020 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaindate.prototype.tolocalestring
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const toLocaleString = Temporal.PlainDate.prototype.toLocaleString;
+
+assert.sameValue(typeof toLocaleString, "function");
+
+assert.throws(TypeError, () => toLocaleString.call(undefined), "undefined");
+assert.throws(TypeError, () => toLocaleString.call(null), "null");
+assert.throws(TypeError, () => toLocaleString.call(true), "true");
+assert.throws(TypeError, () => toLocaleString.call(""), "empty string");
+assert.throws(TypeError, () => toLocaleString.call(Symbol()), "symbol");
+assert.throws(TypeError, () => toLocaleString.call(1), "1");
+assert.throws(TypeError, () => toLocaleString.call({}), "plain object");
+assert.throws(TypeError, () => toLocaleString.call(Temporal.PlainDate), "Temporal.PlainDate");
+assert.throws(TypeError, () => toLocaleString.call(Temporal.PlainDate.prototype), "Temporal.PlainDate.prototype");
diff --git a/test/built-ins/Temporal/PlainDate/prototype/toPlainDateTime/branding.js b/test/built-ins/Temporal/PlainDate/prototype/toPlainDateTime/branding.js
new file mode 100644
index 0000000000..c0e812f89f
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDate/prototype/toPlainDateTime/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2020 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaindate.prototype.toplaindatetime
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const toPlainDateTime = Temporal.PlainDate.prototype.toPlainDateTime;
+
+assert.sameValue(typeof toPlainDateTime, "function");
+
+assert.throws(TypeError, () => toPlainDateTime.call(undefined), "undefined");
+assert.throws(TypeError, () => toPlainDateTime.call(null), "null");
+assert.throws(TypeError, () => toPlainDateTime.call(true), "true");
+assert.throws(TypeError, () => toPlainDateTime.call(""), "empty string");
+assert.throws(TypeError, () => toPlainDateTime.call(Symbol()), "symbol");
+assert.throws(TypeError, () => toPlainDateTime.call(1), "1");
+assert.throws(TypeError, () => toPlainDateTime.call({}), "plain object");
+assert.throws(TypeError, () => toPlainDateTime.call(Temporal.PlainDate), "Temporal.PlainDate");
+assert.throws(TypeError, () => toPlainDateTime.call(Temporal.PlainDate.prototype), "Temporal.PlainDate.prototype");
diff --git a/test/built-ins/Temporal/PlainDate/prototype/toPlainMonthDay/branding.js b/test/built-ins/Temporal/PlainDate/prototype/toPlainMonthDay/branding.js
new file mode 100644
index 0000000000..3579da2ba7
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDate/prototype/toPlainMonthDay/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2020 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaindate.prototype.toplainmonthday
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const toPlainMonthDay = Temporal.PlainDate.prototype.toPlainMonthDay;
+
+assert.sameValue(typeof toPlainMonthDay, "function");
+
+assert.throws(TypeError, () => toPlainMonthDay.call(undefined), "undefined");
+assert.throws(TypeError, () => toPlainMonthDay.call(null), "null");
+assert.throws(TypeError, () => toPlainMonthDay.call(true), "true");
+assert.throws(TypeError, () => toPlainMonthDay.call(""), "empty string");
+assert.throws(TypeError, () => toPlainMonthDay.call(Symbol()), "symbol");
+assert.throws(TypeError, () => toPlainMonthDay.call(1), "1");
+assert.throws(TypeError, () => toPlainMonthDay.call({}), "plain object");
+assert.throws(TypeError, () => toPlainMonthDay.call(Temporal.PlainDate), "Temporal.PlainDate");
+assert.throws(TypeError, () => toPlainMonthDay.call(Temporal.PlainDate.prototype), "Temporal.PlainDate.prototype");
diff --git a/test/built-ins/Temporal/PlainDate/prototype/toPlainYearMonth/branding.js b/test/built-ins/Temporal/PlainDate/prototype/toPlainYearMonth/branding.js
new file mode 100644
index 0000000000..a3ee6e2f37
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDate/prototype/toPlainYearMonth/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2020 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaindate.prototype.toplainyearmonth
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const toPlainYearMonth = Temporal.PlainDate.prototype.toPlainYearMonth;
+
+assert.sameValue(typeof toPlainYearMonth, "function");
+
+assert.throws(TypeError, () => toPlainYearMonth.call(undefined), "undefined");
+assert.throws(TypeError, () => toPlainYearMonth.call(null), "null");
+assert.throws(TypeError, () => toPlainYearMonth.call(true), "true");
+assert.throws(TypeError, () => toPlainYearMonth.call(""), "empty string");
+assert.throws(TypeError, () => toPlainYearMonth.call(Symbol()), "symbol");
+assert.throws(TypeError, () => toPlainYearMonth.call(1), "1");
+assert.throws(TypeError, () => toPlainYearMonth.call({}), "plain object");
+assert.throws(TypeError, () => toPlainYearMonth.call(Temporal.PlainDate), "Temporal.PlainDate");
+assert.throws(TypeError, () => toPlainYearMonth.call(Temporal.PlainDate.prototype), "Temporal.PlainDate.prototype");
diff --git a/test/built-ins/Temporal/PlainDate/prototype/toString/branding.js b/test/built-ins/Temporal/PlainDate/prototype/toString/branding.js
new file mode 100644
index 0000000000..30b7ff54c7
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDate/prototype/toString/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2020 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaindate.prototype.tostring
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const toString = Temporal.PlainDate.prototype.toString;
+
+assert.sameValue(typeof toString, "function");
+
+assert.throws(TypeError, () => toString.call(undefined), "undefined");
+assert.throws(TypeError, () => toString.call(null), "null");
+assert.throws(TypeError, () => toString.call(true), "true");
+assert.throws(TypeError, () => toString.call(""), "empty string");
+assert.throws(TypeError, () => toString.call(Symbol()), "symbol");
+assert.throws(TypeError, () => toString.call(1), "1");
+assert.throws(TypeError, () => toString.call({}), "plain object");
+assert.throws(TypeError, () => toString.call(Temporal.PlainDate), "Temporal.PlainDate");
+assert.throws(TypeError, () => toString.call(Temporal.PlainDate.prototype), "Temporal.PlainDate.prototype");
diff --git a/test/built-ins/Temporal/PlainDate/prototype/toZonedDateTime/branding.js b/test/built-ins/Temporal/PlainDate/prototype/toZonedDateTime/branding.js
new file mode 100644
index 0000000000..7d20da46b1
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDate/prototype/toZonedDateTime/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaindate.prototype.tozoneddatetime
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const toZonedDateTime = Temporal.PlainDate.prototype.toZonedDateTime;
+
+assert.sameValue(typeof toZonedDateTime, "function");
+
+assert.throws(TypeError, () => toZonedDateTime.call(undefined), "undefined");
+assert.throws(TypeError, () => toZonedDateTime.call(null), "null");
+assert.throws(TypeError, () => toZonedDateTime.call(true), "true");
+assert.throws(TypeError, () => toZonedDateTime.call(""), "empty string");
+assert.throws(TypeError, () => toZonedDateTime.call(Symbol()), "symbol");
+assert.throws(TypeError, () => toZonedDateTime.call(1), "1");
+assert.throws(TypeError, () => toZonedDateTime.call({}), "plain object");
+assert.throws(TypeError, () => toZonedDateTime.call(Temporal.PlainDate), "Temporal.PlainDate");
+assert.throws(TypeError, () => toZonedDateTime.call(Temporal.PlainDate.prototype), "Temporal.PlainDate.prototype");
diff --git a/test/built-ins/Temporal/PlainDate/prototype/until/branding.js b/test/built-ins/Temporal/PlainDate/prototype/until/branding.js
new file mode 100644
index 0000000000..ebbafe59ca
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDate/prototype/until/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaindate.prototype.until
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const until = Temporal.PlainDate.prototype.until;
+
+assert.sameValue(typeof until, "function");
+
+assert.throws(TypeError, () => until.call(undefined), "undefined");
+assert.throws(TypeError, () => until.call(null), "null");
+assert.throws(TypeError, () => until.call(true), "true");
+assert.throws(TypeError, () => until.call(""), "empty string");
+assert.throws(TypeError, () => until.call(Symbol()), "symbol");
+assert.throws(TypeError, () => until.call(1), "1");
+assert.throws(TypeError, () => until.call({}), "plain object");
+assert.throws(TypeError, () => until.call(Temporal.PlainDate), "Temporal.PlainDate");
+assert.throws(TypeError, () => until.call(Temporal.PlainDate.prototype), "Temporal.PlainDate.prototype");
diff --git a/test/built-ins/Temporal/PlainDate/prototype/valueOf/branding.js b/test/built-ins/Temporal/PlainDate/prototype/valueOf/branding.js
new file mode 100644
index 0000000000..ac182f3ed9
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDate/prototype/valueOf/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaindate.prototype.valueof
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const valueOf = Temporal.PlainDate.prototype.valueOf;
+
+assert.sameValue(typeof valueOf, "function");
+
+assert.throws(TypeError, () => valueOf.call(undefined), "undefined");
+assert.throws(TypeError, () => valueOf.call(null), "null");
+assert.throws(TypeError, () => valueOf.call(true), "true");
+assert.throws(TypeError, () => valueOf.call(""), "empty string");
+assert.throws(TypeError, () => valueOf.call(Symbol()), "symbol");
+assert.throws(TypeError, () => valueOf.call(1), "1");
+assert.throws(TypeError, () => valueOf.call({}), "plain object");
+assert.throws(TypeError, () => valueOf.call(Temporal.PlainDate), "Temporal.PlainDate");
+assert.throws(TypeError, () => valueOf.call(Temporal.PlainDate.prototype), "Temporal.PlainDate.prototype");
diff --git a/test/built-ins/Temporal/PlainDate/prototype/weekOfYear/branding.js b/test/built-ins/Temporal/PlainDate/prototype/weekOfYear/branding.js
new file mode 100644
index 0000000000..6f50e42048
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDate/prototype/weekOfYear/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2020 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.plaindate.prototype.weekofyear
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const weekOfYear = Object.getOwnPropertyDescriptor(Temporal.PlainDate.prototype, "weekOfYear").get;
+
+assert.sameValue(typeof weekOfYear, "function");
+
+assert.throws(TypeError, () => weekOfYear.call(undefined), "undefined");
+assert.throws(TypeError, () => weekOfYear.call(null), "null");
+assert.throws(TypeError, () => weekOfYear.call(true), "true");
+assert.throws(TypeError, () => weekOfYear.call(""), "empty string");
+assert.throws(TypeError, () => weekOfYear.call(Symbol()), "symbol");
+assert.throws(TypeError, () => weekOfYear.call(1), "1");
+assert.throws(TypeError, () => weekOfYear.call({}), "plain object");
+assert.throws(TypeError, () => weekOfYear.call(Temporal.PlainDate), "Temporal.PlainDate");
+assert.throws(TypeError, () => weekOfYear.call(Temporal.PlainDate.prototype), "Temporal.PlainDate.prototype");
diff --git a/test/built-ins/Temporal/PlainDate/prototype/with/branding.js b/test/built-ins/Temporal/PlainDate/prototype/with/branding.js
new file mode 100644
index 0000000000..e6210e0c51
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDate/prototype/with/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2020 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaindate.prototype.with
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const with_ = Temporal.PlainDate.prototype.with;
+
+assert.sameValue(typeof with_, "function");
+
+assert.throws(TypeError, () => with_.call(undefined), "undefined");
+assert.throws(TypeError, () => with_.call(null), "null");
+assert.throws(TypeError, () => with_.call(true), "true");
+assert.throws(TypeError, () => with_.call(""), "empty string");
+assert.throws(TypeError, () => with_.call(Symbol()), "symbol");
+assert.throws(TypeError, () => with_.call(1), "1");
+assert.throws(TypeError, () => with_.call({}), "plain object");
+assert.throws(TypeError, () => with_.call(Temporal.PlainDate), "Temporal.PlainDate");
+assert.throws(TypeError, () => with_.call(Temporal.PlainDate.prototype), "Temporal.PlainDate.prototype");
diff --git a/test/built-ins/Temporal/PlainDate/prototype/withCalendar/branding.js b/test/built-ins/Temporal/PlainDate/prototype/withCalendar/branding.js
new file mode 100644
index 0000000000..97f9b34713
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDate/prototype/withCalendar/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaindate.prototype.withcalendar
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const withCalendar = Temporal.PlainDate.prototype.withCalendar;
+
+assert.sameValue(typeof withCalendar, "function");
+
+assert.throws(TypeError, () => withCalendar.call(undefined), "undefined");
+assert.throws(TypeError, () => withCalendar.call(null), "null");
+assert.throws(TypeError, () => withCalendar.call(true), "true");
+assert.throws(TypeError, () => withCalendar.call(""), "empty string");
+assert.throws(TypeError, () => withCalendar.call(Symbol()), "symbol");
+assert.throws(TypeError, () => withCalendar.call(1), "1");
+assert.throws(TypeError, () => withCalendar.call({}), "plain object");
+assert.throws(TypeError, () => withCalendar.call(Temporal.PlainDate), "Temporal.PlainDate");
+assert.throws(TypeError, () => withCalendar.call(Temporal.PlainDate.prototype), "Temporal.PlainDate.prototype");
diff --git a/test/built-ins/Temporal/PlainDate/prototype/year/branding.js b/test/built-ins/Temporal/PlainDate/prototype/year/branding.js
new file mode 100644
index 0000000000..ebfeff60a7
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDate/prototype/year/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2020 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.plaindate.prototype.year
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const year = Object.getOwnPropertyDescriptor(Temporal.PlainDate.prototype, "year").get;
+
+assert.sameValue(typeof year, "function");
+
+assert.throws(TypeError, () => year.call(undefined), "undefined");
+assert.throws(TypeError, () => year.call(null), "null");
+assert.throws(TypeError, () => year.call(true), "true");
+assert.throws(TypeError, () => year.call(""), "empty string");
+assert.throws(TypeError, () => year.call(Symbol()), "symbol");
+assert.throws(TypeError, () => year.call(1), "1");
+assert.throws(TypeError, () => year.call({}), "plain object");
+assert.throws(TypeError, () => year.call(Temporal.PlainDate), "Temporal.PlainDate");
+assert.throws(TypeError, () => year.call(Temporal.PlainDate.prototype), "Temporal.PlainDate.prototype");
diff --git a/test/built-ins/Temporal/PlainDateTime/prototype/add/branding.js b/test/built-ins/Temporal/PlainDateTime/prototype/add/branding.js
new file mode 100644
index 0000000000..161aa7d25d
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDateTime/prototype/add/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaindatetime.prototype.add
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const add = Temporal.PlainDateTime.prototype.add;
+
+assert.sameValue(typeof add, "function");
+
+assert.throws(TypeError, () => add.call(undefined), "undefined");
+assert.throws(TypeError, () => add.call(null), "null");
+assert.throws(TypeError, () => add.call(true), "true");
+assert.throws(TypeError, () => add.call(""), "empty string");
+assert.throws(TypeError, () => add.call(Symbol()), "symbol");
+assert.throws(TypeError, () => add.call(1), "1");
+assert.throws(TypeError, () => add.call({}), "plain object");
+assert.throws(TypeError, () => add.call(Temporal.PlainDateTime), "Temporal.PlainDateTime");
+assert.throws(TypeError, () => add.call(Temporal.PlainDateTime.prototype), "Temporal.PlainDateTime.prototype");
diff --git a/test/built-ins/Temporal/PlainDateTime/prototype/calendar/branding.js b/test/built-ins/Temporal/PlainDateTime/prototype/calendar/branding.js
new file mode 100644
index 0000000000..bd6f81d610
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDateTime/prototype/calendar/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.plaindatetime.prototype.calendar
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const calendar = Object.getOwnPropertyDescriptor(Temporal.PlainDateTime.prototype, "calendar").get;
+
+assert.sameValue(typeof calendar, "function");
+
+assert.throws(TypeError, () => calendar.call(undefined), "undefined");
+assert.throws(TypeError, () => calendar.call(null), "null");
+assert.throws(TypeError, () => calendar.call(true), "true");
+assert.throws(TypeError, () => calendar.call(""), "empty string");
+assert.throws(TypeError, () => calendar.call(Symbol()), "symbol");
+assert.throws(TypeError, () => calendar.call(1), "1");
+assert.throws(TypeError, () => calendar.call({}), "plain object");
+assert.throws(TypeError, () => calendar.call(Temporal.PlainDateTime), "Temporal.PlainDateTime");
+assert.throws(TypeError, () => calendar.call(Temporal.PlainDateTime.prototype), "Temporal.PlainDateTime.prototype");
diff --git a/test/built-ins/Temporal/PlainDateTime/prototype/day/branding.js b/test/built-ins/Temporal/PlainDateTime/prototype/day/branding.js
new file mode 100644
index 0000000000..0d11824721
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDateTime/prototype/day/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.plaindatetime.prototype.day
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const day = Object.getOwnPropertyDescriptor(Temporal.PlainDateTime.prototype, "day").get;
+
+assert.sameValue(typeof day, "function");
+
+assert.throws(TypeError, () => day.call(undefined), "undefined");
+assert.throws(TypeError, () => day.call(null), "null");
+assert.throws(TypeError, () => day.call(true), "true");
+assert.throws(TypeError, () => day.call(""), "empty string");
+assert.throws(TypeError, () => day.call(Symbol()), "symbol");
+assert.throws(TypeError, () => day.call(1), "1");
+assert.throws(TypeError, () => day.call({}), "plain object");
+assert.throws(TypeError, () => day.call(Temporal.PlainDateTime), "Temporal.PlainDateTime");
+assert.throws(TypeError, () => day.call(Temporal.PlainDateTime.prototype), "Temporal.PlainDateTime.prototype");
diff --git a/test/built-ins/Temporal/PlainDateTime/prototype/dayOfWeek/branding.js b/test/built-ins/Temporal/PlainDateTime/prototype/dayOfWeek/branding.js
new file mode 100644
index 0000000000..448bb32163
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDateTime/prototype/dayOfWeek/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.plaindatetime.prototype.dayofweek
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const dayOfWeek = Object.getOwnPropertyDescriptor(Temporal.PlainDateTime.prototype, "dayOfWeek").get;
+
+assert.sameValue(typeof dayOfWeek, "function");
+
+assert.throws(TypeError, () => dayOfWeek.call(undefined), "undefined");
+assert.throws(TypeError, () => dayOfWeek.call(null), "null");
+assert.throws(TypeError, () => dayOfWeek.call(true), "true");
+assert.throws(TypeError, () => dayOfWeek.call(""), "empty string");
+assert.throws(TypeError, () => dayOfWeek.call(Symbol()), "symbol");
+assert.throws(TypeError, () => dayOfWeek.call(1), "1");
+assert.throws(TypeError, () => dayOfWeek.call({}), "plain object");
+assert.throws(TypeError, () => dayOfWeek.call(Temporal.PlainDateTime), "Temporal.PlainDateTime");
+assert.throws(TypeError, () => dayOfWeek.call(Temporal.PlainDateTime.prototype), "Temporal.PlainDateTime.prototype");
diff --git a/test/built-ins/Temporal/PlainDateTime/prototype/dayOfYear/branding.js b/test/built-ins/Temporal/PlainDateTime/prototype/dayOfYear/branding.js
new file mode 100644
index 0000000000..c087ca74c5
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDateTime/prototype/dayOfYear/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.plaindatetime.prototype.dayofyear
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const dayOfYear = Object.getOwnPropertyDescriptor(Temporal.PlainDateTime.prototype, "dayOfYear").get;
+
+assert.sameValue(typeof dayOfYear, "function");
+
+assert.throws(TypeError, () => dayOfYear.call(undefined), "undefined");
+assert.throws(TypeError, () => dayOfYear.call(null), "null");
+assert.throws(TypeError, () => dayOfYear.call(true), "true");
+assert.throws(TypeError, () => dayOfYear.call(""), "empty string");
+assert.throws(TypeError, () => dayOfYear.call(Symbol()), "symbol");
+assert.throws(TypeError, () => dayOfYear.call(1), "1");
+assert.throws(TypeError, () => dayOfYear.call({}), "plain object");
+assert.throws(TypeError, () => dayOfYear.call(Temporal.PlainDateTime), "Temporal.PlainDateTime");
+assert.throws(TypeError, () => dayOfYear.call(Temporal.PlainDateTime.prototype), "Temporal.PlainDateTime.prototype");
diff --git a/test/built-ins/Temporal/PlainDateTime/prototype/daysInMonth/branding.js b/test/built-ins/Temporal/PlainDateTime/prototype/daysInMonth/branding.js
new file mode 100644
index 0000000000..33581a2336
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDateTime/prototype/daysInMonth/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.plaindatetime.prototype.daysinmonth
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const daysInMonth = Object.getOwnPropertyDescriptor(Temporal.PlainDateTime.prototype, "daysInMonth").get;
+
+assert.sameValue(typeof daysInMonth, "function");
+
+assert.throws(TypeError, () => daysInMonth.call(undefined), "undefined");
+assert.throws(TypeError, () => daysInMonth.call(null), "null");
+assert.throws(TypeError, () => daysInMonth.call(true), "true");
+assert.throws(TypeError, () => daysInMonth.call(""), "empty string");
+assert.throws(TypeError, () => daysInMonth.call(Symbol()), "symbol");
+assert.throws(TypeError, () => daysInMonth.call(1), "1");
+assert.throws(TypeError, () => daysInMonth.call({}), "plain object");
+assert.throws(TypeError, () => daysInMonth.call(Temporal.PlainDateTime), "Temporal.PlainDateTime");
+assert.throws(TypeError, () => daysInMonth.call(Temporal.PlainDateTime.prototype), "Temporal.PlainDateTime.prototype");
diff --git a/test/built-ins/Temporal/PlainDateTime/prototype/daysInWeek/branding.js b/test/built-ins/Temporal/PlainDateTime/prototype/daysInWeek/branding.js
new file mode 100644
index 0000000000..1ed028e2d2
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDateTime/prototype/daysInWeek/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.plaindatetime.prototype.daysinweek
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const daysInWeek = Object.getOwnPropertyDescriptor(Temporal.PlainDateTime.prototype, "daysInWeek").get;
+
+assert.sameValue(typeof daysInWeek, "function");
+
+assert.throws(TypeError, () => daysInWeek.call(undefined), "undefined");
+assert.throws(TypeError, () => daysInWeek.call(null), "null");
+assert.throws(TypeError, () => daysInWeek.call(true), "true");
+assert.throws(TypeError, () => daysInWeek.call(""), "empty string");
+assert.throws(TypeError, () => daysInWeek.call(Symbol()), "symbol");
+assert.throws(TypeError, () => daysInWeek.call(1), "1");
+assert.throws(TypeError, () => daysInWeek.call({}), "plain object");
+assert.throws(TypeError, () => daysInWeek.call(Temporal.PlainDateTime), "Temporal.PlainDateTime");
+assert.throws(TypeError, () => daysInWeek.call(Temporal.PlainDateTime.prototype), "Temporal.PlainDateTime.prototype");
diff --git a/test/built-ins/Temporal/PlainDateTime/prototype/daysInYear/branding.js b/test/built-ins/Temporal/PlainDateTime/prototype/daysInYear/branding.js
new file mode 100644
index 0000000000..3533365549
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDateTime/prototype/daysInYear/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.plaindatetime.prototype.daysinyear
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const daysInYear = Object.getOwnPropertyDescriptor(Temporal.PlainDateTime.prototype, "daysInYear").get;
+
+assert.sameValue(typeof daysInYear, "function");
+
+assert.throws(TypeError, () => daysInYear.call(undefined), "undefined");
+assert.throws(TypeError, () => daysInYear.call(null), "null");
+assert.throws(TypeError, () => daysInYear.call(true), "true");
+assert.throws(TypeError, () => daysInYear.call(""), "empty string");
+assert.throws(TypeError, () => daysInYear.call(Symbol()), "symbol");
+assert.throws(TypeError, () => daysInYear.call(1), "1");
+assert.throws(TypeError, () => daysInYear.call({}), "plain object");
+assert.throws(TypeError, () => daysInYear.call(Temporal.PlainDateTime), "Temporal.PlainDateTime");
+assert.throws(TypeError, () => daysInYear.call(Temporal.PlainDateTime.prototype), "Temporal.PlainDateTime.prototype");
diff --git a/test/built-ins/Temporal/PlainDateTime/prototype/equals/branding.js b/test/built-ins/Temporal/PlainDateTime/prototype/equals/branding.js
new file mode 100644
index 0000000000..3b87c808bc
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDateTime/prototype/equals/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2020 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaindatetime.prototype.equals
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const equals = Temporal.PlainDateTime.prototype.equals;
+
+assert.sameValue(typeof equals, "function");
+
+assert.throws(TypeError, () => equals.call(undefined), "undefined");
+assert.throws(TypeError, () => equals.call(null), "null");
+assert.throws(TypeError, () => equals.call(true), "true");
+assert.throws(TypeError, () => equals.call(""), "empty string");
+assert.throws(TypeError, () => equals.call(Symbol()), "symbol");
+assert.throws(TypeError, () => equals.call(1), "1");
+assert.throws(TypeError, () => equals.call({}), "plain object");
+assert.throws(TypeError, () => equals.call(Temporal.PlainDateTime), "Temporal.PlainDateTime");
+assert.throws(TypeError, () => equals.call(Temporal.PlainDateTime.prototype), "Temporal.PlainDateTime.prototype");
diff --git a/test/built-ins/Temporal/PlainDateTime/prototype/era/branding.js b/test/built-ins/Temporal/PlainDateTime/prototype/era/branding.js
new file mode 100644
index 0000000000..851522209d
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDateTime/prototype/era/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.plaindatetime.prototype.era
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const era = Object.getOwnPropertyDescriptor(Temporal.PlainDateTime.prototype, "era").get;
+
+assert.sameValue(typeof era, "function");
+
+assert.throws(TypeError, () => era.call(undefined), "undefined");
+assert.throws(TypeError, () => era.call(null), "null");
+assert.throws(TypeError, () => era.call(true), "true");
+assert.throws(TypeError, () => era.call(""), "empty string");
+assert.throws(TypeError, () => era.call(Symbol()), "symbol");
+assert.throws(TypeError, () => era.call(1), "1");
+assert.throws(TypeError, () => era.call({}), "plain object");
+assert.throws(TypeError, () => era.call(Temporal.PlainDateTime), "Temporal.PlainDateTime");
+assert.throws(TypeError, () => era.call(Temporal.PlainDateTime.prototype), "Temporal.PlainDateTime.prototype");
diff --git a/test/built-ins/Temporal/PlainDateTime/prototype/eraYear/branding.js b/test/built-ins/Temporal/PlainDateTime/prototype/eraYear/branding.js
new file mode 100644
index 0000000000..22bf08c798
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDateTime/prototype/eraYear/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.plaindatetime.prototype.erayear
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const eraYear = Object.getOwnPropertyDescriptor(Temporal.PlainDateTime.prototype, "eraYear").get;
+
+assert.sameValue(typeof eraYear, "function");
+
+assert.throws(TypeError, () => eraYear.call(undefined), "undefined");
+assert.throws(TypeError, () => eraYear.call(null), "null");
+assert.throws(TypeError, () => eraYear.call(true), "true");
+assert.throws(TypeError, () => eraYear.call(""), "empty string");
+assert.throws(TypeError, () => eraYear.call(Symbol()), "symbol");
+assert.throws(TypeError, () => eraYear.call(1), "1");
+assert.throws(TypeError, () => eraYear.call({}), "plain object");
+assert.throws(TypeError, () => eraYear.call(Temporal.PlainDateTime), "Temporal.PlainDateTime");
+assert.throws(TypeError, () => eraYear.call(Temporal.PlainDateTime.prototype), "Temporal.PlainDateTime.prototype");
diff --git a/test/built-ins/Temporal/PlainDateTime/prototype/getISOFields/branding.js b/test/built-ins/Temporal/PlainDateTime/prototype/getISOFields/branding.js
new file mode 100644
index 0000000000..d4a26742b3
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDateTime/prototype/getISOFields/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2020 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaindatetime.prototype.getisofields
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const getISOFields = Temporal.PlainDateTime.prototype.getISOFields;
+
+assert.sameValue(typeof getISOFields, "function");
+
+assert.throws(TypeError, () => getISOFields.call(undefined), "undefined");
+assert.throws(TypeError, () => getISOFields.call(null), "null");
+assert.throws(TypeError, () => getISOFields.call(true), "true");
+assert.throws(TypeError, () => getISOFields.call(""), "empty string");
+assert.throws(TypeError, () => getISOFields.call(Symbol()), "symbol");
+assert.throws(TypeError, () => getISOFields.call(1), "1");
+assert.throws(TypeError, () => getISOFields.call({}), "plain object");
+assert.throws(TypeError, () => getISOFields.call(Temporal.PlainDateTime), "Temporal.PlainDateTime");
+assert.throws(TypeError, () => getISOFields.call(Temporal.PlainDateTime.prototype), "Temporal.PlainDateTime.prototype");
diff --git a/test/built-ins/Temporal/PlainDateTime/prototype/hour/branding.js b/test/built-ins/Temporal/PlainDateTime/prototype/hour/branding.js
new file mode 100644
index 0000000000..099259fca9
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDateTime/prototype/hour/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.plaindatetime.prototype.hour
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const hour = Object.getOwnPropertyDescriptor(Temporal.PlainDateTime.prototype, "hour").get;
+
+assert.sameValue(typeof hour, "function");
+
+assert.throws(TypeError, () => hour.call(undefined), "undefined");
+assert.throws(TypeError, () => hour.call(null), "null");
+assert.throws(TypeError, () => hour.call(true), "true");
+assert.throws(TypeError, () => hour.call(""), "empty string");
+assert.throws(TypeError, () => hour.call(Symbol()), "symbol");
+assert.throws(TypeError, () => hour.call(1), "1");
+assert.throws(TypeError, () => hour.call({}), "plain object");
+assert.throws(TypeError, () => hour.call(Temporal.PlainDateTime), "Temporal.PlainDateTime");
+assert.throws(TypeError, () => hour.call(Temporal.PlainDateTime.prototype), "Temporal.PlainDateTime.prototype");
diff --git a/test/built-ins/Temporal/PlainDateTime/prototype/inLeapYear/branding.js b/test/built-ins/Temporal/PlainDateTime/prototype/inLeapYear/branding.js
new file mode 100644
index 0000000000..07d7783d37
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDateTime/prototype/inLeapYear/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.plaindatetime.prototype.inleapyear
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const inLeapYear = Object.getOwnPropertyDescriptor(Temporal.PlainDateTime.prototype, "inLeapYear").get;
+
+assert.sameValue(typeof inLeapYear, "function");
+
+assert.throws(TypeError, () => inLeapYear.call(undefined), "undefined");
+assert.throws(TypeError, () => inLeapYear.call(null), "null");
+assert.throws(TypeError, () => inLeapYear.call(true), "true");
+assert.throws(TypeError, () => inLeapYear.call(""), "empty string");
+assert.throws(TypeError, () => inLeapYear.call(Symbol()), "symbol");
+assert.throws(TypeError, () => inLeapYear.call(1), "1");
+assert.throws(TypeError, () => inLeapYear.call({}), "plain object");
+assert.throws(TypeError, () => inLeapYear.call(Temporal.PlainDateTime), "Temporal.PlainDateTime");
+assert.throws(TypeError, () => inLeapYear.call(Temporal.PlainDateTime.prototype), "Temporal.PlainDateTime.prototype");
diff --git a/test/built-ins/Temporal/PlainDateTime/prototype/microsecond/branding.js b/test/built-ins/Temporal/PlainDateTime/prototype/microsecond/branding.js
new file mode 100644
index 0000000000..260fd9720c
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDateTime/prototype/microsecond/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.plaindatetime.prototype.microsecond
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const microsecond = Object.getOwnPropertyDescriptor(Temporal.PlainDateTime.prototype, "microsecond").get;
+
+assert.sameValue(typeof microsecond, "function");
+
+assert.throws(TypeError, () => microsecond.call(undefined), "undefined");
+assert.throws(TypeError, () => microsecond.call(null), "null");
+assert.throws(TypeError, () => microsecond.call(true), "true");
+assert.throws(TypeError, () => microsecond.call(""), "empty string");
+assert.throws(TypeError, () => microsecond.call(Symbol()), "symbol");
+assert.throws(TypeError, () => microsecond.call(1), "1");
+assert.throws(TypeError, () => microsecond.call({}), "plain object");
+assert.throws(TypeError, () => microsecond.call(Temporal.PlainDateTime), "Temporal.PlainDateTime");
+assert.throws(TypeError, () => microsecond.call(Temporal.PlainDateTime.prototype), "Temporal.PlainDateTime.prototype");
diff --git a/test/built-ins/Temporal/PlainDateTime/prototype/millisecond/branding.js b/test/built-ins/Temporal/PlainDateTime/prototype/millisecond/branding.js
new file mode 100644
index 0000000000..564c7090d1
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDateTime/prototype/millisecond/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.plaindatetime.prototype.millisecond
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const millisecond = Object.getOwnPropertyDescriptor(Temporal.PlainDateTime.prototype, "millisecond").get;
+
+assert.sameValue(typeof millisecond, "function");
+
+assert.throws(TypeError, () => millisecond.call(undefined), "undefined");
+assert.throws(TypeError, () => millisecond.call(null), "null");
+assert.throws(TypeError, () => millisecond.call(true), "true");
+assert.throws(TypeError, () => millisecond.call(""), "empty string");
+assert.throws(TypeError, () => millisecond.call(Symbol()), "symbol");
+assert.throws(TypeError, () => millisecond.call(1), "1");
+assert.throws(TypeError, () => millisecond.call({}), "plain object");
+assert.throws(TypeError, () => millisecond.call(Temporal.PlainDateTime), "Temporal.PlainDateTime");
+assert.throws(TypeError, () => millisecond.call(Temporal.PlainDateTime.prototype), "Temporal.PlainDateTime.prototype");
diff --git a/test/built-ins/Temporal/PlainDateTime/prototype/minute/branding.js b/test/built-ins/Temporal/PlainDateTime/prototype/minute/branding.js
new file mode 100644
index 0000000000..b3d8636a44
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDateTime/prototype/minute/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.plaindatetime.prototype.minute
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const minute = Object.getOwnPropertyDescriptor(Temporal.PlainDateTime.prototype, "minute").get;
+
+assert.sameValue(typeof minute, "function");
+
+assert.throws(TypeError, () => minute.call(undefined), "undefined");
+assert.throws(TypeError, () => minute.call(null), "null");
+assert.throws(TypeError, () => minute.call(true), "true");
+assert.throws(TypeError, () => minute.call(""), "empty string");
+assert.throws(TypeError, () => minute.call(Symbol()), "symbol");
+assert.throws(TypeError, () => minute.call(1), "1");
+assert.throws(TypeError, () => minute.call({}), "plain object");
+assert.throws(TypeError, () => minute.call(Temporal.PlainDateTime), "Temporal.PlainDateTime");
+assert.throws(TypeError, () => minute.call(Temporal.PlainDateTime.prototype), "Temporal.PlainDateTime.prototype");
diff --git a/test/built-ins/Temporal/PlainDateTime/prototype/month/branding.js b/test/built-ins/Temporal/PlainDateTime/prototype/month/branding.js
new file mode 100644
index 0000000000..aa27102e16
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDateTime/prototype/month/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.plaindatetime.prototype.month
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const month = Object.getOwnPropertyDescriptor(Temporal.PlainDateTime.prototype, "month").get;
+
+assert.sameValue(typeof month, "function");
+
+assert.throws(TypeError, () => month.call(undefined), "undefined");
+assert.throws(TypeError, () => month.call(null), "null");
+assert.throws(TypeError, () => month.call(true), "true");
+assert.throws(TypeError, () => month.call(""), "empty string");
+assert.throws(TypeError, () => month.call(Symbol()), "symbol");
+assert.throws(TypeError, () => month.call(1), "1");
+assert.throws(TypeError, () => month.call({}), "plain object");
+assert.throws(TypeError, () => month.call(Temporal.PlainDateTime), "Temporal.PlainDateTime");
+assert.throws(TypeError, () => month.call(Temporal.PlainDateTime.prototype), "Temporal.PlainDateTime.prototype");
diff --git a/test/built-ins/Temporal/PlainDateTime/prototype/monthCode/branding.js b/test/built-ins/Temporal/PlainDateTime/prototype/monthCode/branding.js
new file mode 100644
index 0000000000..ed692d4063
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDateTime/prototype/monthCode/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.plaindatetime.prototype.monthcode
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const monthCode = Object.getOwnPropertyDescriptor(Temporal.PlainDateTime.prototype, "monthCode").get;
+
+assert.sameValue(typeof monthCode, "function");
+
+assert.throws(TypeError, () => monthCode.call(undefined), "undefined");
+assert.throws(TypeError, () => monthCode.call(null), "null");
+assert.throws(TypeError, () => monthCode.call(true), "true");
+assert.throws(TypeError, () => monthCode.call(""), "empty string");
+assert.throws(TypeError, () => monthCode.call(Symbol()), "symbol");
+assert.throws(TypeError, () => monthCode.call(1), "1");
+assert.throws(TypeError, () => monthCode.call({}), "plain object");
+assert.throws(TypeError, () => monthCode.call(Temporal.PlainDateTime), "Temporal.PlainDateTime");
+assert.throws(TypeError, () => monthCode.call(Temporal.PlainDateTime.prototype), "Temporal.PlainDateTime.prototype");
diff --git a/test/built-ins/Temporal/PlainDateTime/prototype/monthsInYear/branding.js b/test/built-ins/Temporal/PlainDateTime/prototype/monthsInYear/branding.js
new file mode 100644
index 0000000000..b855d89621
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDateTime/prototype/monthsInYear/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.plaindatetime.prototype.monthsinyear
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const monthsInYear = Object.getOwnPropertyDescriptor(Temporal.PlainDateTime.prototype, "monthsInYear").get;
+
+assert.sameValue(typeof monthsInYear, "function");
+
+assert.throws(TypeError, () => monthsInYear.call(undefined), "undefined");
+assert.throws(TypeError, () => monthsInYear.call(null), "null");
+assert.throws(TypeError, () => monthsInYear.call(true), "true");
+assert.throws(TypeError, () => monthsInYear.call(""), "empty string");
+assert.throws(TypeError, () => monthsInYear.call(Symbol()), "symbol");
+assert.throws(TypeError, () => monthsInYear.call(1), "1");
+assert.throws(TypeError, () => monthsInYear.call({}), "plain object");
+assert.throws(TypeError, () => monthsInYear.call(Temporal.PlainDateTime), "Temporal.PlainDateTime");
+assert.throws(TypeError, () => monthsInYear.call(Temporal.PlainDateTime.prototype), "Temporal.PlainDateTime.prototype");
diff --git a/test/built-ins/Temporal/PlainDateTime/prototype/nanosecond/branding.js b/test/built-ins/Temporal/PlainDateTime/prototype/nanosecond/branding.js
new file mode 100644
index 0000000000..84bd8cb519
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDateTime/prototype/nanosecond/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.plaindatetime.prototype.nanosecond
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const nanosecond = Object.getOwnPropertyDescriptor(Temporal.PlainDateTime.prototype, "nanosecond").get;
+
+assert.sameValue(typeof nanosecond, "function");
+
+assert.throws(TypeError, () => nanosecond.call(undefined), "undefined");
+assert.throws(TypeError, () => nanosecond.call(null), "null");
+assert.throws(TypeError, () => nanosecond.call(true), "true");
+assert.throws(TypeError, () => nanosecond.call(""), "empty string");
+assert.throws(TypeError, () => nanosecond.call(Symbol()), "symbol");
+assert.throws(TypeError, () => nanosecond.call(1), "1");
+assert.throws(TypeError, () => nanosecond.call({}), "plain object");
+assert.throws(TypeError, () => nanosecond.call(Temporal.PlainDateTime), "Temporal.PlainDateTime");
+assert.throws(TypeError, () => nanosecond.call(Temporal.PlainDateTime.prototype), "Temporal.PlainDateTime.prototype");
diff --git a/test/built-ins/Temporal/PlainDateTime/prototype/round/branding.js b/test/built-ins/Temporal/PlainDateTime/prototype/round/branding.js
new file mode 100644
index 0000000000..9efbaff9c4
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDateTime/prototype/round/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaindatetime.prototype.round
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const round = Temporal.PlainDateTime.prototype.round;
+
+assert.sameValue(typeof round, "function");
+
+assert.throws(TypeError, () => round.call(undefined), "undefined");
+assert.throws(TypeError, () => round.call(null), "null");
+assert.throws(TypeError, () => round.call(true), "true");
+assert.throws(TypeError, () => round.call(""), "empty string");
+assert.throws(TypeError, () => round.call(Symbol()), "symbol");
+assert.throws(TypeError, () => round.call(1), "1");
+assert.throws(TypeError, () => round.call({}), "plain object");
+assert.throws(TypeError, () => round.call(Temporal.PlainDateTime), "Temporal.PlainDateTime");
+assert.throws(TypeError, () => round.call(Temporal.PlainDateTime.prototype), "Temporal.PlainDateTime.prototype");
diff --git a/test/built-ins/Temporal/PlainDateTime/prototype/second/branding.js b/test/built-ins/Temporal/PlainDateTime/prototype/second/branding.js
new file mode 100644
index 0000000000..4715b18b48
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDateTime/prototype/second/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.plaindatetime.prototype.second
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const second = Object.getOwnPropertyDescriptor(Temporal.PlainDateTime.prototype, "second").get;
+
+assert.sameValue(typeof second, "function");
+
+assert.throws(TypeError, () => second.call(undefined), "undefined");
+assert.throws(TypeError, () => second.call(null), "null");
+assert.throws(TypeError, () => second.call(true), "true");
+assert.throws(TypeError, () => second.call(""), "empty string");
+assert.throws(TypeError, () => second.call(Symbol()), "symbol");
+assert.throws(TypeError, () => second.call(1), "1");
+assert.throws(TypeError, () => second.call({}), "plain object");
+assert.throws(TypeError, () => second.call(Temporal.PlainDateTime), "Temporal.PlainDateTime");
+assert.throws(TypeError, () => second.call(Temporal.PlainDateTime.prototype), "Temporal.PlainDateTime.prototype");
diff --git a/test/built-ins/Temporal/PlainDateTime/prototype/since/branding.js b/test/built-ins/Temporal/PlainDateTime/prototype/since/branding.js
new file mode 100644
index 0000000000..c516e4d2c5
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDateTime/prototype/since/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaindatetime.prototype.since
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const since = Temporal.PlainDateTime.prototype.since;
+
+assert.sameValue(typeof since, "function");
+
+assert.throws(TypeError, () => since.call(undefined), "undefined");
+assert.throws(TypeError, () => since.call(null), "null");
+assert.throws(TypeError, () => since.call(true), "true");
+assert.throws(TypeError, () => since.call(""), "empty string");
+assert.throws(TypeError, () => since.call(Symbol()), "symbol");
+assert.throws(TypeError, () => since.call(1), "1");
+assert.throws(TypeError, () => since.call({}), "plain object");
+assert.throws(TypeError, () => since.call(Temporal.PlainDateTime), "Temporal.PlainDateTime");
+assert.throws(TypeError, () => since.call(Temporal.PlainDateTime.prototype), "Temporal.PlainDateTime.prototype");
diff --git a/test/built-ins/Temporal/PlainDateTime/prototype/subtract/branding.js b/test/built-ins/Temporal/PlainDateTime/prototype/subtract/branding.js
new file mode 100644
index 0000000000..8c29b1fc8e
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDateTime/prototype/subtract/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaindatetime.prototype.subtract
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const subtract = Temporal.PlainDateTime.prototype.subtract;
+
+assert.sameValue(typeof subtract, "function");
+
+assert.throws(TypeError, () => subtract.call(undefined), "undefined");
+assert.throws(TypeError, () => subtract.call(null), "null");
+assert.throws(TypeError, () => subtract.call(true), "true");
+assert.throws(TypeError, () => subtract.call(""), "empty string");
+assert.throws(TypeError, () => subtract.call(Symbol()), "symbol");
+assert.throws(TypeError, () => subtract.call(1), "1");
+assert.throws(TypeError, () => subtract.call({}), "plain object");
+assert.throws(TypeError, () => subtract.call(Temporal.PlainDateTime), "Temporal.PlainDateTime");
+assert.throws(TypeError, () => subtract.call(Temporal.PlainDateTime.prototype), "Temporal.PlainDateTime.prototype");
diff --git a/test/built-ins/Temporal/PlainDateTime/prototype/toJSON/branding.js b/test/built-ins/Temporal/PlainDateTime/prototype/toJSON/branding.js
new file mode 100644
index 0000000000..e9fcdb62b1
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDateTime/prototype/toJSON/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaindatetime.prototype.tojson
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const toJSON = Temporal.PlainDateTime.prototype.toJSON;
+
+assert.sameValue(typeof toJSON, "function");
+
+assert.throws(TypeError, () => toJSON.call(undefined), "undefined");
+assert.throws(TypeError, () => toJSON.call(null), "null");
+assert.throws(TypeError, () => toJSON.call(true), "true");
+assert.throws(TypeError, () => toJSON.call(""), "empty string");
+assert.throws(TypeError, () => toJSON.call(Symbol()), "symbol");
+assert.throws(TypeError, () => toJSON.call(1), "1");
+assert.throws(TypeError, () => toJSON.call({}), "plain object");
+assert.throws(TypeError, () => toJSON.call(Temporal.PlainDateTime), "Temporal.PlainDateTime");
+assert.throws(TypeError, () => toJSON.call(Temporal.PlainDateTime.prototype), "Temporal.PlainDateTime.prototype");
diff --git a/test/built-ins/Temporal/PlainDateTime/prototype/toLocaleString/branding.js b/test/built-ins/Temporal/PlainDateTime/prototype/toLocaleString/branding.js
new file mode 100644
index 0000000000..3f81e81149
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDateTime/prototype/toLocaleString/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaindatetime.prototype.tolocalestring
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const toLocaleString = Temporal.PlainDateTime.prototype.toLocaleString;
+
+assert.sameValue(typeof toLocaleString, "function");
+
+assert.throws(TypeError, () => toLocaleString.call(undefined), "undefined");
+assert.throws(TypeError, () => toLocaleString.call(null), "null");
+assert.throws(TypeError, () => toLocaleString.call(true), "true");
+assert.throws(TypeError, () => toLocaleString.call(""), "empty string");
+assert.throws(TypeError, () => toLocaleString.call(Symbol()), "symbol");
+assert.throws(TypeError, () => toLocaleString.call(1), "1");
+assert.throws(TypeError, () => toLocaleString.call({}), "plain object");
+assert.throws(TypeError, () => toLocaleString.call(Temporal.PlainDateTime), "Temporal.PlainDateTime");
+assert.throws(TypeError, () => toLocaleString.call(Temporal.PlainDateTime.prototype), "Temporal.PlainDateTime.prototype");
diff --git a/test/built-ins/Temporal/PlainDateTime/prototype/toPlainDate/branding.js b/test/built-ins/Temporal/PlainDateTime/prototype/toPlainDate/branding.js
new file mode 100644
index 0000000000..d6c346b8e1
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDateTime/prototype/toPlainDate/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaindatetime.prototype.toplaindate
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const toPlainDate = Temporal.PlainDateTime.prototype.toPlainDate;
+
+assert.sameValue(typeof toPlainDate, "function");
+
+assert.throws(TypeError, () => toPlainDate.call(undefined), "undefined");
+assert.throws(TypeError, () => toPlainDate.call(null), "null");
+assert.throws(TypeError, () => toPlainDate.call(true), "true");
+assert.throws(TypeError, () => toPlainDate.call(""), "empty string");
+assert.throws(TypeError, () => toPlainDate.call(Symbol()), "symbol");
+assert.throws(TypeError, () => toPlainDate.call(1), "1");
+assert.throws(TypeError, () => toPlainDate.call({}), "plain object");
+assert.throws(TypeError, () => toPlainDate.call(Temporal.PlainDateTime), "Temporal.PlainDateTime");
+assert.throws(TypeError, () => toPlainDate.call(Temporal.PlainDateTime.prototype), "Temporal.PlainDateTime.prototype");
diff --git a/test/built-ins/Temporal/PlainDateTime/prototype/toPlainMonthDay/branding.js b/test/built-ins/Temporal/PlainDateTime/prototype/toPlainMonthDay/branding.js
new file mode 100644
index 0000000000..e8a63bb90b
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDateTime/prototype/toPlainMonthDay/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaindatetime.prototype.toplainmonthday
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const toPlainMonthDay = Temporal.PlainDateTime.prototype.toPlainMonthDay;
+
+assert.sameValue(typeof toPlainMonthDay, "function");
+
+assert.throws(TypeError, () => toPlainMonthDay.call(undefined), "undefined");
+assert.throws(TypeError, () => toPlainMonthDay.call(null), "null");
+assert.throws(TypeError, () => toPlainMonthDay.call(true), "true");
+assert.throws(TypeError, () => toPlainMonthDay.call(""), "empty string");
+assert.throws(TypeError, () => toPlainMonthDay.call(Symbol()), "symbol");
+assert.throws(TypeError, () => toPlainMonthDay.call(1), "1");
+assert.throws(TypeError, () => toPlainMonthDay.call({}), "plain object");
+assert.throws(TypeError, () => toPlainMonthDay.call(Temporal.PlainDateTime), "Temporal.PlainDateTime");
+assert.throws(TypeError, () => toPlainMonthDay.call(Temporal.PlainDateTime.prototype), "Temporal.PlainDateTime.prototype");
diff --git a/test/built-ins/Temporal/PlainDateTime/prototype/toPlainTime/branding.js b/test/built-ins/Temporal/PlainDateTime/prototype/toPlainTime/branding.js
new file mode 100644
index 0000000000..4fc32cef67
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDateTime/prototype/toPlainTime/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaindatetime.prototype.toplaintime
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const toPlainTime = Temporal.PlainDateTime.prototype.toPlainTime;
+
+assert.sameValue(typeof toPlainTime, "function");
+
+assert.throws(TypeError, () => toPlainTime.call(undefined), "undefined");
+assert.throws(TypeError, () => toPlainTime.call(null), "null");
+assert.throws(TypeError, () => toPlainTime.call(true), "true");
+assert.throws(TypeError, () => toPlainTime.call(""), "empty string");
+assert.throws(TypeError, () => toPlainTime.call(Symbol()), "symbol");
+assert.throws(TypeError, () => toPlainTime.call(1), "1");
+assert.throws(TypeError, () => toPlainTime.call({}), "plain object");
+assert.throws(TypeError, () => toPlainTime.call(Temporal.PlainDateTime), "Temporal.PlainDateTime");
+assert.throws(TypeError, () => toPlainTime.call(Temporal.PlainDateTime.prototype), "Temporal.PlainDateTime.prototype");
diff --git a/test/built-ins/Temporal/PlainDateTime/prototype/toPlainYearMonth/branding.js b/test/built-ins/Temporal/PlainDateTime/prototype/toPlainYearMonth/branding.js
new file mode 100644
index 0000000000..0ce564e3ee
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDateTime/prototype/toPlainYearMonth/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaindatetime.prototype.toplainyearmonth
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const toPlainYearMonth = Temporal.PlainDateTime.prototype.toPlainYearMonth;
+
+assert.sameValue(typeof toPlainYearMonth, "function");
+
+assert.throws(TypeError, () => toPlainYearMonth.call(undefined), "undefined");
+assert.throws(TypeError, () => toPlainYearMonth.call(null), "null");
+assert.throws(TypeError, () => toPlainYearMonth.call(true), "true");
+assert.throws(TypeError, () => toPlainYearMonth.call(""), "empty string");
+assert.throws(TypeError, () => toPlainYearMonth.call(Symbol()), "symbol");
+assert.throws(TypeError, () => toPlainYearMonth.call(1), "1");
+assert.throws(TypeError, () => toPlainYearMonth.call({}), "plain object");
+assert.throws(TypeError, () => toPlainYearMonth.call(Temporal.PlainDateTime), "Temporal.PlainDateTime");
+assert.throws(TypeError, () => toPlainYearMonth.call(Temporal.PlainDateTime.prototype), "Temporal.PlainDateTime.prototype");
diff --git a/test/built-ins/Temporal/PlainDateTime/prototype/toString/branding.js b/test/built-ins/Temporal/PlainDateTime/prototype/toString/branding.js
new file mode 100644
index 0000000000..58cca42f67
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDateTime/prototype/toString/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaindatetime.prototype.tostring
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const toString = Temporal.PlainDateTime.prototype.toString;
+
+assert.sameValue(typeof toString, "function");
+
+assert.throws(TypeError, () => toString.call(undefined), "undefined");
+assert.throws(TypeError, () => toString.call(null), "null");
+assert.throws(TypeError, () => toString.call(true), "true");
+assert.throws(TypeError, () => toString.call(""), "empty string");
+assert.throws(TypeError, () => toString.call(Symbol()), "symbol");
+assert.throws(TypeError, () => toString.call(1), "1");
+assert.throws(TypeError, () => toString.call({}), "plain object");
+assert.throws(TypeError, () => toString.call(Temporal.PlainDateTime), "Temporal.PlainDateTime");
+assert.throws(TypeError, () => toString.call(Temporal.PlainDateTime.prototype), "Temporal.PlainDateTime.prototype");
diff --git a/test/built-ins/Temporal/PlainDateTime/prototype/toZonedDateTime/branding.js b/test/built-ins/Temporal/PlainDateTime/prototype/toZonedDateTime/branding.js
new file mode 100644
index 0000000000..e8f419afce
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDateTime/prototype/toZonedDateTime/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaindatetime.prototype.tozoneddatetime
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const toZonedDateTime = Temporal.PlainDateTime.prototype.toZonedDateTime;
+
+assert.sameValue(typeof toZonedDateTime, "function");
+
+assert.throws(TypeError, () => toZonedDateTime.call(undefined), "undefined");
+assert.throws(TypeError, () => toZonedDateTime.call(null), "null");
+assert.throws(TypeError, () => toZonedDateTime.call(true), "true");
+assert.throws(TypeError, () => toZonedDateTime.call(""), "empty string");
+assert.throws(TypeError, () => toZonedDateTime.call(Symbol()), "symbol");
+assert.throws(TypeError, () => toZonedDateTime.call(1), "1");
+assert.throws(TypeError, () => toZonedDateTime.call({}), "plain object");
+assert.throws(TypeError, () => toZonedDateTime.call(Temporal.PlainDateTime), "Temporal.PlainDateTime");
+assert.throws(TypeError, () => toZonedDateTime.call(Temporal.PlainDateTime.prototype), "Temporal.PlainDateTime.prototype");
diff --git a/test/built-ins/Temporal/PlainDateTime/prototype/until/branding.js b/test/built-ins/Temporal/PlainDateTime/prototype/until/branding.js
new file mode 100644
index 0000000000..d879f44b80
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDateTime/prototype/until/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaindatetime.prototype.until
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const until = Temporal.PlainDateTime.prototype.until;
+
+assert.sameValue(typeof until, "function");
+
+assert.throws(TypeError, () => until.call(undefined), "undefined");
+assert.throws(TypeError, () => until.call(null), "null");
+assert.throws(TypeError, () => until.call(true), "true");
+assert.throws(TypeError, () => until.call(""), "empty string");
+assert.throws(TypeError, () => until.call(Symbol()), "symbol");
+assert.throws(TypeError, () => until.call(1), "1");
+assert.throws(TypeError, () => until.call({}), "plain object");
+assert.throws(TypeError, () => until.call(Temporal.PlainDateTime), "Temporal.PlainDateTime");
+assert.throws(TypeError, () => until.call(Temporal.PlainDateTime.prototype), "Temporal.PlainDateTime.prototype");
diff --git a/test/built-ins/Temporal/PlainDateTime/prototype/valueOf/branding.js b/test/built-ins/Temporal/PlainDateTime/prototype/valueOf/branding.js
new file mode 100644
index 0000000000..6f99bbc1f3
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDateTime/prototype/valueOf/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaindatetime.prototype.valueof
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const valueOf = Temporal.PlainDateTime.prototype.valueOf;
+
+assert.sameValue(typeof valueOf, "function");
+
+assert.throws(TypeError, () => valueOf.call(undefined), "undefined");
+assert.throws(TypeError, () => valueOf.call(null), "null");
+assert.throws(TypeError, () => valueOf.call(true), "true");
+assert.throws(TypeError, () => valueOf.call(""), "empty string");
+assert.throws(TypeError, () => valueOf.call(Symbol()), "symbol");
+assert.throws(TypeError, () => valueOf.call(1), "1");
+assert.throws(TypeError, () => valueOf.call({}), "plain object");
+assert.throws(TypeError, () => valueOf.call(Temporal.PlainDateTime), "Temporal.PlainDateTime");
+assert.throws(TypeError, () => valueOf.call(Temporal.PlainDateTime.prototype), "Temporal.PlainDateTime.prototype");
diff --git a/test/built-ins/Temporal/PlainDateTime/prototype/weekOfYear/branding.js b/test/built-ins/Temporal/PlainDateTime/prototype/weekOfYear/branding.js
new file mode 100644
index 0000000000..6b09742503
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDateTime/prototype/weekOfYear/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.plaindatetime.prototype.weekofyear
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const weekOfYear = Object.getOwnPropertyDescriptor(Temporal.PlainDateTime.prototype, "weekOfYear").get;
+
+assert.sameValue(typeof weekOfYear, "function");
+
+assert.throws(TypeError, () => weekOfYear.call(undefined), "undefined");
+assert.throws(TypeError, () => weekOfYear.call(null), "null");
+assert.throws(TypeError, () => weekOfYear.call(true), "true");
+assert.throws(TypeError, () => weekOfYear.call(""), "empty string");
+assert.throws(TypeError, () => weekOfYear.call(Symbol()), "symbol");
+assert.throws(TypeError, () => weekOfYear.call(1), "1");
+assert.throws(TypeError, () => weekOfYear.call({}), "plain object");
+assert.throws(TypeError, () => weekOfYear.call(Temporal.PlainDateTime), "Temporal.PlainDateTime");
+assert.throws(TypeError, () => weekOfYear.call(Temporal.PlainDateTime.prototype), "Temporal.PlainDateTime.prototype");
diff --git a/test/built-ins/Temporal/PlainDateTime/prototype/with/branding.js b/test/built-ins/Temporal/PlainDateTime/prototype/with/branding.js
new file mode 100644
index 0000000000..2b9421210c
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDateTime/prototype/with/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaindatetime.prototype.with
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const with_ = Temporal.PlainDateTime.prototype.with;
+
+assert.sameValue(typeof with_, "function");
+
+assert.throws(TypeError, () => with_.call(undefined), "undefined");
+assert.throws(TypeError, () => with_.call(null), "null");
+assert.throws(TypeError, () => with_.call(true), "true");
+assert.throws(TypeError, () => with_.call(""), "empty string");
+assert.throws(TypeError, () => with_.call(Symbol()), "symbol");
+assert.throws(TypeError, () => with_.call(1), "1");
+assert.throws(TypeError, () => with_.call({}), "plain object");
+assert.throws(TypeError, () => with_.call(Temporal.PlainDateTime), "Temporal.PlainDateTime");
+assert.throws(TypeError, () => with_.call(Temporal.PlainDateTime.prototype), "Temporal.PlainDateTime.prototype");
diff --git a/test/built-ins/Temporal/PlainDateTime/prototype/withCalendar/branding.js b/test/built-ins/Temporal/PlainDateTime/prototype/withCalendar/branding.js
new file mode 100644
index 0000000000..6c001fb6ef
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDateTime/prototype/withCalendar/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaindatetime.prototype.withcalendar
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const withCalendar = Temporal.PlainDateTime.prototype.withCalendar;
+
+assert.sameValue(typeof withCalendar, "function");
+
+assert.throws(TypeError, () => withCalendar.call(undefined), "undefined");
+assert.throws(TypeError, () => withCalendar.call(null), "null");
+assert.throws(TypeError, () => withCalendar.call(true), "true");
+assert.throws(TypeError, () => withCalendar.call(""), "empty string");
+assert.throws(TypeError, () => withCalendar.call(Symbol()), "symbol");
+assert.throws(TypeError, () => withCalendar.call(1), "1");
+assert.throws(TypeError, () => withCalendar.call({}), "plain object");
+assert.throws(TypeError, () => withCalendar.call(Temporal.PlainDateTime), "Temporal.PlainDateTime");
+assert.throws(TypeError, () => withCalendar.call(Temporal.PlainDateTime.prototype), "Temporal.PlainDateTime.prototype");
diff --git a/test/built-ins/Temporal/PlainDateTime/prototype/withPlainDate/branding.js b/test/built-ins/Temporal/PlainDateTime/prototype/withPlainDate/branding.js
new file mode 100644
index 0000000000..e4d5ef4341
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDateTime/prototype/withPlainDate/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaindatetime.prototype.withplaindate
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const withPlainDate = Temporal.PlainDateTime.prototype.withPlainDate;
+
+assert.sameValue(typeof withPlainDate, "function");
+
+assert.throws(TypeError, () => withPlainDate.call(undefined), "undefined");
+assert.throws(TypeError, () => withPlainDate.call(null), "null");
+assert.throws(TypeError, () => withPlainDate.call(true), "true");
+assert.throws(TypeError, () => withPlainDate.call(""), "empty string");
+assert.throws(TypeError, () => withPlainDate.call(Symbol()), "symbol");
+assert.throws(TypeError, () => withPlainDate.call(1), "1");
+assert.throws(TypeError, () => withPlainDate.call({}), "plain object");
+assert.throws(TypeError, () => withPlainDate.call(Temporal.PlainDateTime), "Temporal.PlainDateTime");
+assert.throws(TypeError, () => withPlainDate.call(Temporal.PlainDateTime.prototype), "Temporal.PlainDateTime.prototype");
diff --git a/test/built-ins/Temporal/PlainDateTime/prototype/withPlainTime/branding.js b/test/built-ins/Temporal/PlainDateTime/prototype/withPlainTime/branding.js
new file mode 100644
index 0000000000..90c823bb1c
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDateTime/prototype/withPlainTime/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaindatetime.prototype.withplaintime
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const withPlainTime = Temporal.PlainDateTime.prototype.withPlainTime;
+
+assert.sameValue(typeof withPlainTime, "function");
+
+assert.throws(TypeError, () => withPlainTime.call(undefined), "undefined");
+assert.throws(TypeError, () => withPlainTime.call(null), "null");
+assert.throws(TypeError, () => withPlainTime.call(true), "true");
+assert.throws(TypeError, () => withPlainTime.call(""), "empty string");
+assert.throws(TypeError, () => withPlainTime.call(Symbol()), "symbol");
+assert.throws(TypeError, () => withPlainTime.call(1), "1");
+assert.throws(TypeError, () => withPlainTime.call({}), "plain object");
+assert.throws(TypeError, () => withPlainTime.call(Temporal.PlainDateTime), "Temporal.PlainDateTime");
+assert.throws(TypeError, () => withPlainTime.call(Temporal.PlainDateTime.prototype), "Temporal.PlainDateTime.prototype");
diff --git a/test/built-ins/Temporal/PlainDateTime/prototype/year/branding.js b/test/built-ins/Temporal/PlainDateTime/prototype/year/branding.js
new file mode 100644
index 0000000000..afd2f206e5
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDateTime/prototype/year/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.plaindatetime.prototype.year
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const year = Object.getOwnPropertyDescriptor(Temporal.PlainDateTime.prototype, "year").get;
+
+assert.sameValue(typeof year, "function");
+
+assert.throws(TypeError, () => year.call(undefined), "undefined");
+assert.throws(TypeError, () => year.call(null), "null");
+assert.throws(TypeError, () => year.call(true), "true");
+assert.throws(TypeError, () => year.call(""), "empty string");
+assert.throws(TypeError, () => year.call(Symbol()), "symbol");
+assert.throws(TypeError, () => year.call(1), "1");
+assert.throws(TypeError, () => year.call({}), "plain object");
+assert.throws(TypeError, () => year.call(Temporal.PlainDateTime), "Temporal.PlainDateTime");
+assert.throws(TypeError, () => year.call(Temporal.PlainDateTime.prototype), "Temporal.PlainDateTime.prototype");
diff --git a/test/built-ins/Temporal/PlainMonthDay/prototype/calendar/branding.js b/test/built-ins/Temporal/PlainMonthDay/prototype/calendar/branding.js
new file mode 100644
index 0000000000..adf20ff9ae
--- /dev/null
+++ b/test/built-ins/Temporal/PlainMonthDay/prototype/calendar/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.plainmonthday.prototype.calendar
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const calendar = Object.getOwnPropertyDescriptor(Temporal.PlainMonthDay.prototype, "calendar").get;
+
+assert.sameValue(typeof calendar, "function");
+
+assert.throws(TypeError, () => calendar.call(undefined), "undefined");
+assert.throws(TypeError, () => calendar.call(null), "null");
+assert.throws(TypeError, () => calendar.call(true), "true");
+assert.throws(TypeError, () => calendar.call(""), "empty string");
+assert.throws(TypeError, () => calendar.call(Symbol()), "symbol");
+assert.throws(TypeError, () => calendar.call(1), "1");
+assert.throws(TypeError, () => calendar.call({}), "plain object");
+assert.throws(TypeError, () => calendar.call(Temporal.PlainMonthDay), "Temporal.PlainMonthDay");
+assert.throws(TypeError, () => calendar.call(Temporal.PlainMonthDay.prototype), "Temporal.PlainMonthDay.prototype");
diff --git a/test/built-ins/Temporal/PlainMonthDay/prototype/day/branding.js b/test/built-ins/Temporal/PlainMonthDay/prototype/day/branding.js
new file mode 100644
index 0000000000..3c8d274e39
--- /dev/null
+++ b/test/built-ins/Temporal/PlainMonthDay/prototype/day/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.plainmonthday.prototype.day
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const day = Object.getOwnPropertyDescriptor(Temporal.PlainMonthDay.prototype, "day").get;
+
+assert.sameValue(typeof day, "function");
+
+assert.throws(TypeError, () => day.call(undefined), "undefined");
+assert.throws(TypeError, () => day.call(null), "null");
+assert.throws(TypeError, () => day.call(true), "true");
+assert.throws(TypeError, () => day.call(""), "empty string");
+assert.throws(TypeError, () => day.call(Symbol()), "symbol");
+assert.throws(TypeError, () => day.call(1), "1");
+assert.throws(TypeError, () => day.call({}), "plain object");
+assert.throws(TypeError, () => day.call(Temporal.PlainMonthDay), "Temporal.PlainMonthDay");
+assert.throws(TypeError, () => day.call(Temporal.PlainMonthDay.prototype), "Temporal.PlainMonthDay.prototype");
diff --git a/test/built-ins/Temporal/PlainMonthDay/prototype/equals/branding.js b/test/built-ins/Temporal/PlainMonthDay/prototype/equals/branding.js
new file mode 100644
index 0000000000..88bb5ad25a
--- /dev/null
+++ b/test/built-ins/Temporal/PlainMonthDay/prototype/equals/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2020 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plainmonthday.prototype.equals
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const equals = Temporal.PlainMonthDay.prototype.equals;
+
+assert.sameValue(typeof equals, "function");
+
+assert.throws(TypeError, () => equals.call(undefined), "undefined");
+assert.throws(TypeError, () => equals.call(null), "null");
+assert.throws(TypeError, () => equals.call(true), "true");
+assert.throws(TypeError, () => equals.call(""), "empty string");
+assert.throws(TypeError, () => equals.call(Symbol()), "symbol");
+assert.throws(TypeError, () => equals.call(1), "1");
+assert.throws(TypeError, () => equals.call({}), "plain object");
+assert.throws(TypeError, () => equals.call(Temporal.PlainMonthDay), "Temporal.PlainMonthDay");
+assert.throws(TypeError, () => equals.call(Temporal.PlainMonthDay.prototype), "Temporal.PlainMonthDay.prototype");
diff --git a/test/built-ins/Temporal/PlainMonthDay/prototype/getISOFields/branding.js b/test/built-ins/Temporal/PlainMonthDay/prototype/getISOFields/branding.js
new file mode 100644
index 0000000000..9a9805250c
--- /dev/null
+++ b/test/built-ins/Temporal/PlainMonthDay/prototype/getISOFields/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2020 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plainmonthday.prototype.getisofields
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const getISOFields = Temporal.PlainMonthDay.prototype.getISOFields;
+
+assert.sameValue(typeof getISOFields, "function");
+
+assert.throws(TypeError, () => getISOFields.call(undefined), "undefined");
+assert.throws(TypeError, () => getISOFields.call(null), "null");
+assert.throws(TypeError, () => getISOFields.call(true), "true");
+assert.throws(TypeError, () => getISOFields.call(""), "empty string");
+assert.throws(TypeError, () => getISOFields.call(Symbol()), "symbol");
+assert.throws(TypeError, () => getISOFields.call(1), "1");
+assert.throws(TypeError, () => getISOFields.call({}), "plain object");
+assert.throws(TypeError, () => getISOFields.call(Temporal.PlainMonthDay), "Temporal.PlainMonthDay");
+assert.throws(TypeError, () => getISOFields.call(Temporal.PlainMonthDay.prototype), "Temporal.PlainMonthDay.prototype");
diff --git a/test/built-ins/Temporal/PlainMonthDay/prototype/monthCode/branding.js b/test/built-ins/Temporal/PlainMonthDay/prototype/monthCode/branding.js
new file mode 100644
index 0000000000..9f511333e1
--- /dev/null
+++ b/test/built-ins/Temporal/PlainMonthDay/prototype/monthCode/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.plainmonthday.prototype.monthcode
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const monthCode = Object.getOwnPropertyDescriptor(Temporal.PlainMonthDay.prototype, "monthCode").get;
+
+assert.sameValue(typeof monthCode, "function");
+
+assert.throws(TypeError, () => monthCode.call(undefined), "undefined");
+assert.throws(TypeError, () => monthCode.call(null), "null");
+assert.throws(TypeError, () => monthCode.call(true), "true");
+assert.throws(TypeError, () => monthCode.call(""), "empty string");
+assert.throws(TypeError, () => monthCode.call(Symbol()), "symbol");
+assert.throws(TypeError, () => monthCode.call(1), "1");
+assert.throws(TypeError, () => monthCode.call({}), "plain object");
+assert.throws(TypeError, () => monthCode.call(Temporal.PlainMonthDay), "Temporal.PlainMonthDay");
+assert.throws(TypeError, () => monthCode.call(Temporal.PlainMonthDay.prototype), "Temporal.PlainMonthDay.prototype");
diff --git a/test/built-ins/Temporal/PlainMonthDay/prototype/toJSON/branding.js b/test/built-ins/Temporal/PlainMonthDay/prototype/toJSON/branding.js
new file mode 100644
index 0000000000..996ffd883f
--- /dev/null
+++ b/test/built-ins/Temporal/PlainMonthDay/prototype/toJSON/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plainmonthday.prototype.tojson
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const toJSON = Temporal.PlainMonthDay.prototype.toJSON;
+
+assert.sameValue(typeof toJSON, "function");
+
+assert.throws(TypeError, () => toJSON.call(undefined), "undefined");
+assert.throws(TypeError, () => toJSON.call(null), "null");
+assert.throws(TypeError, () => toJSON.call(true), "true");
+assert.throws(TypeError, () => toJSON.call(""), "empty string");
+assert.throws(TypeError, () => toJSON.call(Symbol()), "symbol");
+assert.throws(TypeError, () => toJSON.call(1), "1");
+assert.throws(TypeError, () => toJSON.call({}), "plain object");
+assert.throws(TypeError, () => toJSON.call(Temporal.PlainMonthDay), "Temporal.PlainMonthDay");
+assert.throws(TypeError, () => toJSON.call(Temporal.PlainMonthDay.prototype), "Temporal.PlainMonthDay.prototype");
diff --git a/test/built-ins/Temporal/PlainMonthDay/prototype/toLocaleString/branding.js b/test/built-ins/Temporal/PlainMonthDay/prototype/toLocaleString/branding.js
new file mode 100644
index 0000000000..273b40964b
--- /dev/null
+++ b/test/built-ins/Temporal/PlainMonthDay/prototype/toLocaleString/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plainmonthday.prototype.tolocalestring
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const toLocaleString = Temporal.PlainMonthDay.prototype.toLocaleString;
+
+assert.sameValue(typeof toLocaleString, "function");
+
+assert.throws(TypeError, () => toLocaleString.call(undefined), "undefined");
+assert.throws(TypeError, () => toLocaleString.call(null), "null");
+assert.throws(TypeError, () => toLocaleString.call(true), "true");
+assert.throws(TypeError, () => toLocaleString.call(""), "empty string");
+assert.throws(TypeError, () => toLocaleString.call(Symbol()), "symbol");
+assert.throws(TypeError, () => toLocaleString.call(1), "1");
+assert.throws(TypeError, () => toLocaleString.call({}), "plain object");
+assert.throws(TypeError, () => toLocaleString.call(Temporal.PlainMonthDay), "Temporal.PlainMonthDay");
+assert.throws(TypeError, () => toLocaleString.call(Temporal.PlainMonthDay.prototype), "Temporal.PlainMonthDay.prototype");
diff --git a/test/built-ins/Temporal/PlainMonthDay/prototype/toPlainDate/branding.js b/test/built-ins/Temporal/PlainMonthDay/prototype/toPlainDate/branding.js
new file mode 100644
index 0000000000..eb321664b3
--- /dev/null
+++ b/test/built-ins/Temporal/PlainMonthDay/prototype/toPlainDate/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plainmonthday.prototype.toplaindate
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const toPlainDate = Temporal.PlainMonthDay.prototype.toPlainDate;
+
+assert.sameValue(typeof toPlainDate, "function");
+
+assert.throws(TypeError, () => toPlainDate.call(undefined), "undefined");
+assert.throws(TypeError, () => toPlainDate.call(null), "null");
+assert.throws(TypeError, () => toPlainDate.call(true), "true");
+assert.throws(TypeError, () => toPlainDate.call(""), "empty string");
+assert.throws(TypeError, () => toPlainDate.call(Symbol()), "symbol");
+assert.throws(TypeError, () => toPlainDate.call(1), "1");
+assert.throws(TypeError, () => toPlainDate.call({}), "plain object");
+assert.throws(TypeError, () => toPlainDate.call(Temporal.PlainMonthDay), "Temporal.PlainMonthDay");
+assert.throws(TypeError, () => toPlainDate.call(Temporal.PlainMonthDay.prototype), "Temporal.PlainMonthDay.prototype");
diff --git a/test/built-ins/Temporal/PlainMonthDay/prototype/toString/branding.js b/test/built-ins/Temporal/PlainMonthDay/prototype/toString/branding.js
new file mode 100644
index 0000000000..2388be21ef
--- /dev/null
+++ b/test/built-ins/Temporal/PlainMonthDay/prototype/toString/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plainmonthday.prototype.tostring
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const toString = Temporal.PlainMonthDay.prototype.toString;
+
+assert.sameValue(typeof toString, "function");
+
+assert.throws(TypeError, () => toString.call(undefined), "undefined");
+assert.throws(TypeError, () => toString.call(null), "null");
+assert.throws(TypeError, () => toString.call(true), "true");
+assert.throws(TypeError, () => toString.call(""), "empty string");
+assert.throws(TypeError, () => toString.call(Symbol()), "symbol");
+assert.throws(TypeError, () => toString.call(1), "1");
+assert.throws(TypeError, () => toString.call({}), "plain object");
+assert.throws(TypeError, () => toString.call(Temporal.PlainMonthDay), "Temporal.PlainMonthDay");
+assert.throws(TypeError, () => toString.call(Temporal.PlainMonthDay.prototype), "Temporal.PlainMonthDay.prototype");
diff --git a/test/built-ins/Temporal/PlainMonthDay/prototype/valueOf/branding.js b/test/built-ins/Temporal/PlainMonthDay/prototype/valueOf/branding.js
new file mode 100644
index 0000000000..354f67906b
--- /dev/null
+++ b/test/built-ins/Temporal/PlainMonthDay/prototype/valueOf/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plainmonthday.prototype.valueof
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const valueOf = Temporal.PlainMonthDay.prototype.valueOf;
+
+assert.sameValue(typeof valueOf, "function");
+
+assert.throws(TypeError, () => valueOf.call(undefined), "undefined");
+assert.throws(TypeError, () => valueOf.call(null), "null");
+assert.throws(TypeError, () => valueOf.call(true), "true");
+assert.throws(TypeError, () => valueOf.call(""), "empty string");
+assert.throws(TypeError, () => valueOf.call(Symbol()), "symbol");
+assert.throws(TypeError, () => valueOf.call(1), "1");
+assert.throws(TypeError, () => valueOf.call({}), "plain object");
+assert.throws(TypeError, () => valueOf.call(Temporal.PlainMonthDay), "Temporal.PlainMonthDay");
+assert.throws(TypeError, () => valueOf.call(Temporal.PlainMonthDay.prototype), "Temporal.PlainMonthDay.prototype");
diff --git a/test/built-ins/Temporal/PlainMonthDay/prototype/with/branding.js b/test/built-ins/Temporal/PlainMonthDay/prototype/with/branding.js
new file mode 100644
index 0000000000..e178fbad23
--- /dev/null
+++ b/test/built-ins/Temporal/PlainMonthDay/prototype/with/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plainmonthday.prototype.with
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const with_ = Temporal.PlainMonthDay.prototype.with;
+
+assert.sameValue(typeof with_, "function");
+
+assert.throws(TypeError, () => with_.call(undefined), "undefined");
+assert.throws(TypeError, () => with_.call(null), "null");
+assert.throws(TypeError, () => with_.call(true), "true");
+assert.throws(TypeError, () => with_.call(""), "empty string");
+assert.throws(TypeError, () => with_.call(Symbol()), "symbol");
+assert.throws(TypeError, () => with_.call(1), "1");
+assert.throws(TypeError, () => with_.call({}), "plain object");
+assert.throws(TypeError, () => with_.call(Temporal.PlainMonthDay), "Temporal.PlainMonthDay");
+assert.throws(TypeError, () => with_.call(Temporal.PlainMonthDay.prototype), "Temporal.PlainMonthDay.prototype");
diff --git a/test/built-ins/Temporal/PlainTime/prototype/add/branding.js b/test/built-ins/Temporal/PlainTime/prototype/add/branding.js
new file mode 100644
index 0000000000..681834574b
--- /dev/null
+++ b/test/built-ins/Temporal/PlainTime/prototype/add/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaintime.prototype.add
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const add = Temporal.PlainTime.prototype.add;
+
+assert.sameValue(typeof add, "function");
+
+assert.throws(TypeError, () => add.call(undefined), "undefined");
+assert.throws(TypeError, () => add.call(null), "null");
+assert.throws(TypeError, () => add.call(true), "true");
+assert.throws(TypeError, () => add.call(""), "empty string");
+assert.throws(TypeError, () => add.call(Symbol()), "symbol");
+assert.throws(TypeError, () => add.call(1), "1");
+assert.throws(TypeError, () => add.call({}), "plain object");
+assert.throws(TypeError, () => add.call(Temporal.PlainTime), "Temporal.PlainTime");
+assert.throws(TypeError, () => add.call(Temporal.PlainTime.prototype), "Temporal.PlainTime.prototype");
diff --git a/test/built-ins/Temporal/PlainTime/prototype/calendar/branding.js b/test/built-ins/Temporal/PlainTime/prototype/calendar/branding.js
new file mode 100644
index 0000000000..ccf2de2a6c
--- /dev/null
+++ b/test/built-ins/Temporal/PlainTime/prototype/calendar/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.plaintime.prototype.calendar
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const calendar = Object.getOwnPropertyDescriptor(Temporal.PlainTime.prototype, "calendar").get;
+
+assert.sameValue(typeof calendar, "function");
+
+assert.throws(TypeError, () => calendar.call(undefined), "undefined");
+assert.throws(TypeError, () => calendar.call(null), "null");
+assert.throws(TypeError, () => calendar.call(true), "true");
+assert.throws(TypeError, () => calendar.call(""), "empty string");
+assert.throws(TypeError, () => calendar.call(Symbol()), "symbol");
+assert.throws(TypeError, () => calendar.call(1), "1");
+assert.throws(TypeError, () => calendar.call({}), "plain object");
+assert.throws(TypeError, () => calendar.call(Temporal.PlainTime), "Temporal.PlainTime");
+assert.throws(TypeError, () => calendar.call(Temporal.PlainTime.prototype), "Temporal.PlainTime.prototype");
diff --git a/test/built-ins/Temporal/PlainTime/prototype/equals/branding.js b/test/built-ins/Temporal/PlainTime/prototype/equals/branding.js
new file mode 100644
index 0000000000..350a74dd43
--- /dev/null
+++ b/test/built-ins/Temporal/PlainTime/prototype/equals/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2020 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaintime.prototype.equals
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const equals = Temporal.PlainTime.prototype.equals;
+
+assert.sameValue(typeof equals, "function");
+
+assert.throws(TypeError, () => equals.call(undefined), "undefined");
+assert.throws(TypeError, () => equals.call(null), "null");
+assert.throws(TypeError, () => equals.call(true), "true");
+assert.throws(TypeError, () => equals.call(""), "empty string");
+assert.throws(TypeError, () => equals.call(Symbol()), "symbol");
+assert.throws(TypeError, () => equals.call(1), "1");
+assert.throws(TypeError, () => equals.call({}), "plain object");
+assert.throws(TypeError, () => equals.call(Temporal.PlainTime), "Temporal.PlainTime");
+assert.throws(TypeError, () => equals.call(Temporal.PlainTime.prototype), "Temporal.PlainTime.prototype");
diff --git a/test/built-ins/Temporal/PlainTime/prototype/getISOFields/branding.js b/test/built-ins/Temporal/PlainTime/prototype/getISOFields/branding.js
new file mode 100644
index 0000000000..523925b7b8
--- /dev/null
+++ b/test/built-ins/Temporal/PlainTime/prototype/getISOFields/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaintime.prototype.getisofields
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const getISOFields = Temporal.PlainTime.prototype.getISOFields;
+
+assert.sameValue(typeof getISOFields, "function");
+
+assert.throws(TypeError, () => getISOFields.call(undefined), "undefined");
+assert.throws(TypeError, () => getISOFields.call(null), "null");
+assert.throws(TypeError, () => getISOFields.call(true), "true");
+assert.throws(TypeError, () => getISOFields.call(""), "empty string");
+assert.throws(TypeError, () => getISOFields.call(Symbol()), "symbol");
+assert.throws(TypeError, () => getISOFields.call(1), "1");
+assert.throws(TypeError, () => getISOFields.call({}), "plain object");
+assert.throws(TypeError, () => getISOFields.call(Temporal.PlainTime), "Temporal.PlainTime");
+assert.throws(TypeError, () => getISOFields.call(Temporal.PlainTime.prototype), "Temporal.PlainTime.prototype");
diff --git a/test/built-ins/Temporal/PlainTime/prototype/hour/branding.js b/test/built-ins/Temporal/PlainTime/prototype/hour/branding.js
new file mode 100644
index 0000000000..586b32246f
--- /dev/null
+++ b/test/built-ins/Temporal/PlainTime/prototype/hour/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.plaintime.prototype.hour
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const hour = Object.getOwnPropertyDescriptor(Temporal.PlainTime.prototype, "hour").get;
+
+assert.sameValue(typeof hour, "function");
+
+assert.throws(TypeError, () => hour.call(undefined), "undefined");
+assert.throws(TypeError, () => hour.call(null), "null");
+assert.throws(TypeError, () => hour.call(true), "true");
+assert.throws(TypeError, () => hour.call(""), "empty string");
+assert.throws(TypeError, () => hour.call(Symbol()), "symbol");
+assert.throws(TypeError, () => hour.call(1), "1");
+assert.throws(TypeError, () => hour.call({}), "plain object");
+assert.throws(TypeError, () => hour.call(Temporal.PlainTime), "Temporal.PlainTime");
+assert.throws(TypeError, () => hour.call(Temporal.PlainTime.prototype), "Temporal.PlainTime.prototype");
diff --git a/test/built-ins/Temporal/PlainTime/prototype/microsecond/branding.js b/test/built-ins/Temporal/PlainTime/prototype/microsecond/branding.js
new file mode 100644
index 0000000000..9054ea3f86
--- /dev/null
+++ b/test/built-ins/Temporal/PlainTime/prototype/microsecond/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.plaintime.prototype.microsecond
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const microsecond = Object.getOwnPropertyDescriptor(Temporal.PlainTime.prototype, "microsecond").get;
+
+assert.sameValue(typeof microsecond, "function");
+
+assert.throws(TypeError, () => microsecond.call(undefined), "undefined");
+assert.throws(TypeError, () => microsecond.call(null), "null");
+assert.throws(TypeError, () => microsecond.call(true), "true");
+assert.throws(TypeError, () => microsecond.call(""), "empty string");
+assert.throws(TypeError, () => microsecond.call(Symbol()), "symbol");
+assert.throws(TypeError, () => microsecond.call(1), "1");
+assert.throws(TypeError, () => microsecond.call({}), "plain object");
+assert.throws(TypeError, () => microsecond.call(Temporal.PlainTime), "Temporal.PlainTime");
+assert.throws(TypeError, () => microsecond.call(Temporal.PlainTime.prototype), "Temporal.PlainTime.prototype");
diff --git a/test/built-ins/Temporal/PlainTime/prototype/millisecond/branding.js b/test/built-ins/Temporal/PlainTime/prototype/millisecond/branding.js
new file mode 100644
index 0000000000..19c62c4b2d
--- /dev/null
+++ b/test/built-ins/Temporal/PlainTime/prototype/millisecond/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.plaintime.prototype.millisecond
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const millisecond = Object.getOwnPropertyDescriptor(Temporal.PlainTime.prototype, "millisecond").get;
+
+assert.sameValue(typeof millisecond, "function");
+
+assert.throws(TypeError, () => millisecond.call(undefined), "undefined");
+assert.throws(TypeError, () => millisecond.call(null), "null");
+assert.throws(TypeError, () => millisecond.call(true), "true");
+assert.throws(TypeError, () => millisecond.call(""), "empty string");
+assert.throws(TypeError, () => millisecond.call(Symbol()), "symbol");
+assert.throws(TypeError, () => millisecond.call(1), "1");
+assert.throws(TypeError, () => millisecond.call({}), "plain object");
+assert.throws(TypeError, () => millisecond.call(Temporal.PlainTime), "Temporal.PlainTime");
+assert.throws(TypeError, () => millisecond.call(Temporal.PlainTime.prototype), "Temporal.PlainTime.prototype");
diff --git a/test/built-ins/Temporal/PlainTime/prototype/minute/branding.js b/test/built-ins/Temporal/PlainTime/prototype/minute/branding.js
new file mode 100644
index 0000000000..bd05ddebf3
--- /dev/null
+++ b/test/built-ins/Temporal/PlainTime/prototype/minute/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.plaintime.prototype.minute
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const minute = Object.getOwnPropertyDescriptor(Temporal.PlainTime.prototype, "minute").get;
+
+assert.sameValue(typeof minute, "function");
+
+assert.throws(TypeError, () => minute.call(undefined), "undefined");
+assert.throws(TypeError, () => minute.call(null), "null");
+assert.throws(TypeError, () => minute.call(true), "true");
+assert.throws(TypeError, () => minute.call(""), "empty string");
+assert.throws(TypeError, () => minute.call(Symbol()), "symbol");
+assert.throws(TypeError, () => minute.call(1), "1");
+assert.throws(TypeError, () => minute.call({}), "plain object");
+assert.throws(TypeError, () => minute.call(Temporal.PlainTime), "Temporal.PlainTime");
+assert.throws(TypeError, () => minute.call(Temporal.PlainTime.prototype), "Temporal.PlainTime.prototype");
diff --git a/test/built-ins/Temporal/PlainTime/prototype/nanosecond/branding.js b/test/built-ins/Temporal/PlainTime/prototype/nanosecond/branding.js
new file mode 100644
index 0000000000..b4c3354f48
--- /dev/null
+++ b/test/built-ins/Temporal/PlainTime/prototype/nanosecond/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.plaintime.prototype.nanosecond
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const nanosecond = Object.getOwnPropertyDescriptor(Temporal.PlainTime.prototype, "nanosecond").get;
+
+assert.sameValue(typeof nanosecond, "function");
+
+assert.throws(TypeError, () => nanosecond.call(undefined), "undefined");
+assert.throws(TypeError, () => nanosecond.call(null), "null");
+assert.throws(TypeError, () => nanosecond.call(true), "true");
+assert.throws(TypeError, () => nanosecond.call(""), "empty string");
+assert.throws(TypeError, () => nanosecond.call(Symbol()), "symbol");
+assert.throws(TypeError, () => nanosecond.call(1), "1");
+assert.throws(TypeError, () => nanosecond.call({}), "plain object");
+assert.throws(TypeError, () => nanosecond.call(Temporal.PlainTime), "Temporal.PlainTime");
+assert.throws(TypeError, () => nanosecond.call(Temporal.PlainTime.prototype), "Temporal.PlainTime.prototype");
diff --git a/test/built-ins/Temporal/PlainTime/prototype/round/branding.js b/test/built-ins/Temporal/PlainTime/prototype/round/branding.js
new file mode 100644
index 0000000000..e476134418
--- /dev/null
+++ b/test/built-ins/Temporal/PlainTime/prototype/round/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaintime.prototype.round
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const round = Temporal.PlainTime.prototype.round;
+
+assert.sameValue(typeof round, "function");
+
+assert.throws(TypeError, () => round.call(undefined), "undefined");
+assert.throws(TypeError, () => round.call(null), "null");
+assert.throws(TypeError, () => round.call(true), "true");
+assert.throws(TypeError, () => round.call(""), "empty string");
+assert.throws(TypeError, () => round.call(Symbol()), "symbol");
+assert.throws(TypeError, () => round.call(1), "1");
+assert.throws(TypeError, () => round.call({}), "plain object");
+assert.throws(TypeError, () => round.call(Temporal.PlainTime), "Temporal.PlainTime");
+assert.throws(TypeError, () => round.call(Temporal.PlainTime.prototype), "Temporal.PlainTime.prototype");
diff --git a/test/built-ins/Temporal/PlainTime/prototype/second/branding.js b/test/built-ins/Temporal/PlainTime/prototype/second/branding.js
new file mode 100644
index 0000000000..e984aaa80b
--- /dev/null
+++ b/test/built-ins/Temporal/PlainTime/prototype/second/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.plaintime.prototype.second
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const second = Object.getOwnPropertyDescriptor(Temporal.PlainTime.prototype, "second").get;
+
+assert.sameValue(typeof second, "function");
+
+assert.throws(TypeError, () => second.call(undefined), "undefined");
+assert.throws(TypeError, () => second.call(null), "null");
+assert.throws(TypeError, () => second.call(true), "true");
+assert.throws(TypeError, () => second.call(""), "empty string");
+assert.throws(TypeError, () => second.call(Symbol()), "symbol");
+assert.throws(TypeError, () => second.call(1), "1");
+assert.throws(TypeError, () => second.call({}), "plain object");
+assert.throws(TypeError, () => second.call(Temporal.PlainTime), "Temporal.PlainTime");
+assert.throws(TypeError, () => second.call(Temporal.PlainTime.prototype), "Temporal.PlainTime.prototype");
diff --git a/test/built-ins/Temporal/PlainTime/prototype/since/branding.js b/test/built-ins/Temporal/PlainTime/prototype/since/branding.js
new file mode 100644
index 0000000000..632ee5c8b3
--- /dev/null
+++ b/test/built-ins/Temporal/PlainTime/prototype/since/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaintime.prototype.since
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const since = Temporal.PlainTime.prototype.since;
+
+assert.sameValue(typeof since, "function");
+
+assert.throws(TypeError, () => since.call(undefined), "undefined");
+assert.throws(TypeError, () => since.call(null), "null");
+assert.throws(TypeError, () => since.call(true), "true");
+assert.throws(TypeError, () => since.call(""), "empty string");
+assert.throws(TypeError, () => since.call(Symbol()), "symbol");
+assert.throws(TypeError, () => since.call(1), "1");
+assert.throws(TypeError, () => since.call({}), "plain object");
+assert.throws(TypeError, () => since.call(Temporal.PlainTime), "Temporal.PlainTime");
+assert.throws(TypeError, () => since.call(Temporal.PlainTime.prototype), "Temporal.PlainTime.prototype");
diff --git a/test/built-ins/Temporal/PlainTime/prototype/subtract/branding.js b/test/built-ins/Temporal/PlainTime/prototype/subtract/branding.js
new file mode 100644
index 0000000000..503d158caa
--- /dev/null
+++ b/test/built-ins/Temporal/PlainTime/prototype/subtract/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaintime.prototype.subtract
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const subtract = Temporal.PlainTime.prototype.subtract;
+
+assert.sameValue(typeof subtract, "function");
+
+assert.throws(TypeError, () => subtract.call(undefined), "undefined");
+assert.throws(TypeError, () => subtract.call(null), "null");
+assert.throws(TypeError, () => subtract.call(true), "true");
+assert.throws(TypeError, () => subtract.call(""), "empty string");
+assert.throws(TypeError, () => subtract.call(Symbol()), "symbol");
+assert.throws(TypeError, () => subtract.call(1), "1");
+assert.throws(TypeError, () => subtract.call({}), "plain object");
+assert.throws(TypeError, () => subtract.call(Temporal.PlainTime), "Temporal.PlainTime");
+assert.throws(TypeError, () => subtract.call(Temporal.PlainTime.prototype), "Temporal.PlainTime.prototype");
diff --git a/test/built-ins/Temporal/PlainTime/prototype/toJSON/branding.js b/test/built-ins/Temporal/PlainTime/prototype/toJSON/branding.js
new file mode 100644
index 0000000000..56b534e217
--- /dev/null
+++ b/test/built-ins/Temporal/PlainTime/prototype/toJSON/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaintime.prototype.tojson
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const toJSON = Temporal.PlainTime.prototype.toJSON;
+
+assert.sameValue(typeof toJSON, "function");
+
+assert.throws(TypeError, () => toJSON.call(undefined), "undefined");
+assert.throws(TypeError, () => toJSON.call(null), "null");
+assert.throws(TypeError, () => toJSON.call(true), "true");
+assert.throws(TypeError, () => toJSON.call(""), "empty string");
+assert.throws(TypeError, () => toJSON.call(Symbol()), "symbol");
+assert.throws(TypeError, () => toJSON.call(1), "1");
+assert.throws(TypeError, () => toJSON.call({}), "plain object");
+assert.throws(TypeError, () => toJSON.call(Temporal.PlainTime), "Temporal.PlainTime");
+assert.throws(TypeError, () => toJSON.call(Temporal.PlainTime.prototype), "Temporal.PlainTime.prototype");
diff --git a/test/built-ins/Temporal/PlainTime/prototype/toLocaleString/branding.js b/test/built-ins/Temporal/PlainTime/prototype/toLocaleString/branding.js
new file mode 100644
index 0000000000..bacc0ea7bf
--- /dev/null
+++ b/test/built-ins/Temporal/PlainTime/prototype/toLocaleString/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaintime.prototype.tolocalestring
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const toLocaleString = Temporal.PlainTime.prototype.toLocaleString;
+
+assert.sameValue(typeof toLocaleString, "function");
+
+assert.throws(TypeError, () => toLocaleString.call(undefined), "undefined");
+assert.throws(TypeError, () => toLocaleString.call(null), "null");
+assert.throws(TypeError, () => toLocaleString.call(true), "true");
+assert.throws(TypeError, () => toLocaleString.call(""), "empty string");
+assert.throws(TypeError, () => toLocaleString.call(Symbol()), "symbol");
+assert.throws(TypeError, () => toLocaleString.call(1), "1");
+assert.throws(TypeError, () => toLocaleString.call({}), "plain object");
+assert.throws(TypeError, () => toLocaleString.call(Temporal.PlainTime), "Temporal.PlainTime");
+assert.throws(TypeError, () => toLocaleString.call(Temporal.PlainTime.prototype), "Temporal.PlainTime.prototype");
diff --git a/test/built-ins/Temporal/PlainTime/prototype/toPlainDateTime/branding.js b/test/built-ins/Temporal/PlainTime/prototype/toPlainDateTime/branding.js
new file mode 100644
index 0000000000..16a5cd64a0
--- /dev/null
+++ b/test/built-ins/Temporal/PlainTime/prototype/toPlainDateTime/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaintime.prototype.toplaindatetime
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const toPlainDateTime = Temporal.PlainTime.prototype.toPlainDateTime;
+
+assert.sameValue(typeof toPlainDateTime, "function");
+
+assert.throws(TypeError, () => toPlainDateTime.call(undefined), "undefined");
+assert.throws(TypeError, () => toPlainDateTime.call(null), "null");
+assert.throws(TypeError, () => toPlainDateTime.call(true), "true");
+assert.throws(TypeError, () => toPlainDateTime.call(""), "empty string");
+assert.throws(TypeError, () => toPlainDateTime.call(Symbol()), "symbol");
+assert.throws(TypeError, () => toPlainDateTime.call(1), "1");
+assert.throws(TypeError, () => toPlainDateTime.call({}), "plain object");
+assert.throws(TypeError, () => toPlainDateTime.call(Temporal.PlainTime), "Temporal.PlainTime");
+assert.throws(TypeError, () => toPlainDateTime.call(Temporal.PlainTime.prototype), "Temporal.PlainTime.prototype");
diff --git a/test/built-ins/Temporal/PlainTime/prototype/toString/branding.js b/test/built-ins/Temporal/PlainTime/prototype/toString/branding.js
new file mode 100644
index 0000000000..903758004d
--- /dev/null
+++ b/test/built-ins/Temporal/PlainTime/prototype/toString/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaintime.prototype.tostring
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const toString = Temporal.PlainTime.prototype.toString;
+
+assert.sameValue(typeof toString, "function");
+
+assert.throws(TypeError, () => toString.call(undefined), "undefined");
+assert.throws(TypeError, () => toString.call(null), "null");
+assert.throws(TypeError, () => toString.call(true), "true");
+assert.throws(TypeError, () => toString.call(""), "empty string");
+assert.throws(TypeError, () => toString.call(Symbol()), "symbol");
+assert.throws(TypeError, () => toString.call(1), "1");
+assert.throws(TypeError, () => toString.call({}), "plain object");
+assert.throws(TypeError, () => toString.call(Temporal.PlainTime), "Temporal.PlainTime");
+assert.throws(TypeError, () => toString.call(Temporal.PlainTime.prototype), "Temporal.PlainTime.prototype");
diff --git a/test/built-ins/Temporal/PlainTime/prototype/toZonedDateTime/branding.js b/test/built-ins/Temporal/PlainTime/prototype/toZonedDateTime/branding.js
new file mode 100644
index 0000000000..870960fd5a
--- /dev/null
+++ b/test/built-ins/Temporal/PlainTime/prototype/toZonedDateTime/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaintime.prototype.tozoneddatetime
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const toZonedDateTime = Temporal.PlainTime.prototype.toZonedDateTime;
+
+assert.sameValue(typeof toZonedDateTime, "function");
+
+assert.throws(TypeError, () => toZonedDateTime.call(undefined), "undefined");
+assert.throws(TypeError, () => toZonedDateTime.call(null), "null");
+assert.throws(TypeError, () => toZonedDateTime.call(true), "true");
+assert.throws(TypeError, () => toZonedDateTime.call(""), "empty string");
+assert.throws(TypeError, () => toZonedDateTime.call(Symbol()), "symbol");
+assert.throws(TypeError, () => toZonedDateTime.call(1), "1");
+assert.throws(TypeError, () => toZonedDateTime.call({}), "plain object");
+assert.throws(TypeError, () => toZonedDateTime.call(Temporal.PlainTime), "Temporal.PlainTime");
+assert.throws(TypeError, () => toZonedDateTime.call(Temporal.PlainTime.prototype), "Temporal.PlainTime.prototype");
diff --git a/test/built-ins/Temporal/PlainTime/prototype/until/branding.js b/test/built-ins/Temporal/PlainTime/prototype/until/branding.js
new file mode 100644
index 0000000000..44234d5887
--- /dev/null
+++ b/test/built-ins/Temporal/PlainTime/prototype/until/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaintime.prototype.until
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const until = Temporal.PlainTime.prototype.until;
+
+assert.sameValue(typeof until, "function");
+
+assert.throws(TypeError, () => until.call(undefined), "undefined");
+assert.throws(TypeError, () => until.call(null), "null");
+assert.throws(TypeError, () => until.call(true), "true");
+assert.throws(TypeError, () => until.call(""), "empty string");
+assert.throws(TypeError, () => until.call(Symbol()), "symbol");
+assert.throws(TypeError, () => until.call(1), "1");
+assert.throws(TypeError, () => until.call({}), "plain object");
+assert.throws(TypeError, () => until.call(Temporal.PlainTime), "Temporal.PlainTime");
+assert.throws(TypeError, () => until.call(Temporal.PlainTime.prototype), "Temporal.PlainTime.prototype");
diff --git a/test/built-ins/Temporal/PlainTime/prototype/valueOf/branding.js b/test/built-ins/Temporal/PlainTime/prototype/valueOf/branding.js
new file mode 100644
index 0000000000..a92145f42e
--- /dev/null
+++ b/test/built-ins/Temporal/PlainTime/prototype/valueOf/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaintime.prototype.valueof
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const valueOf = Temporal.PlainTime.prototype.valueOf;
+
+assert.sameValue(typeof valueOf, "function");
+
+assert.throws(TypeError, () => valueOf.call(undefined), "undefined");
+assert.throws(TypeError, () => valueOf.call(null), "null");
+assert.throws(TypeError, () => valueOf.call(true), "true");
+assert.throws(TypeError, () => valueOf.call(""), "empty string");
+assert.throws(TypeError, () => valueOf.call(Symbol()), "symbol");
+assert.throws(TypeError, () => valueOf.call(1), "1");
+assert.throws(TypeError, () => valueOf.call({}), "plain object");
+assert.throws(TypeError, () => valueOf.call(Temporal.PlainTime), "Temporal.PlainTime");
+assert.throws(TypeError, () => valueOf.call(Temporal.PlainTime.prototype), "Temporal.PlainTime.prototype");
diff --git a/test/built-ins/Temporal/PlainTime/prototype/with/branding.js b/test/built-ins/Temporal/PlainTime/prototype/with/branding.js
new file mode 100644
index 0000000000..e67ed99889
--- /dev/null
+++ b/test/built-ins/Temporal/PlainTime/prototype/with/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaintime.prototype.with
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const with_ = Temporal.PlainTime.prototype.with;
+
+assert.sameValue(typeof with_, "function");
+
+assert.throws(TypeError, () => with_.call(undefined), "undefined");
+assert.throws(TypeError, () => with_.call(null), "null");
+assert.throws(TypeError, () => with_.call(true), "true");
+assert.throws(TypeError, () => with_.call(""), "empty string");
+assert.throws(TypeError, () => with_.call(Symbol()), "symbol");
+assert.throws(TypeError, () => with_.call(1), "1");
+assert.throws(TypeError, () => with_.call({}), "plain object");
+assert.throws(TypeError, () => with_.call(Temporal.PlainTime), "Temporal.PlainTime");
+assert.throws(TypeError, () => with_.call(Temporal.PlainTime.prototype), "Temporal.PlainTime.prototype");
diff --git a/test/built-ins/Temporal/PlainYearMonth/prototype/add/branding.js b/test/built-ins/Temporal/PlainYearMonth/prototype/add/branding.js
new file mode 100644
index 0000000000..e7b67165b7
--- /dev/null
+++ b/test/built-ins/Temporal/PlainYearMonth/prototype/add/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plainyearmonth.prototype.add
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const add = Temporal.PlainYearMonth.prototype.add;
+
+assert.sameValue(typeof add, "function");
+
+assert.throws(TypeError, () => add.call(undefined), "undefined");
+assert.throws(TypeError, () => add.call(null), "null");
+assert.throws(TypeError, () => add.call(true), "true");
+assert.throws(TypeError, () => add.call(""), "empty string");
+assert.throws(TypeError, () => add.call(Symbol()), "symbol");
+assert.throws(TypeError, () => add.call(1), "1");
+assert.throws(TypeError, () => add.call({}), "plain object");
+assert.throws(TypeError, () => add.call(Temporal.PlainYearMonth), "Temporal.PlainYearMonth");
+assert.throws(TypeError, () => add.call(Temporal.PlainYearMonth.prototype), "Temporal.PlainYearMonth.prototype");
diff --git a/test/built-ins/Temporal/PlainYearMonth/prototype/calendar/branding.js b/test/built-ins/Temporal/PlainYearMonth/prototype/calendar/branding.js
new file mode 100644
index 0000000000..4235571465
--- /dev/null
+++ b/test/built-ins/Temporal/PlainYearMonth/prototype/calendar/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.plainyearmonth.prototype.calendar
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const calendar = Object.getOwnPropertyDescriptor(Temporal.PlainYearMonth.prototype, "calendar").get;
+
+assert.sameValue(typeof calendar, "function");
+
+assert.throws(TypeError, () => calendar.call(undefined), "undefined");
+assert.throws(TypeError, () => calendar.call(null), "null");
+assert.throws(TypeError, () => calendar.call(true), "true");
+assert.throws(TypeError, () => calendar.call(""), "empty string");
+assert.throws(TypeError, () => calendar.call(Symbol()), "symbol");
+assert.throws(TypeError, () => calendar.call(1), "1");
+assert.throws(TypeError, () => calendar.call({}), "plain object");
+assert.throws(TypeError, () => calendar.call(Temporal.PlainYearMonth), "Temporal.PlainYearMonth");
+assert.throws(TypeError, () => calendar.call(Temporal.PlainYearMonth.prototype), "Temporal.PlainYearMonth.prototype");
diff --git a/test/built-ins/Temporal/PlainYearMonth/prototype/daysInMonth/branding.js b/test/built-ins/Temporal/PlainYearMonth/prototype/daysInMonth/branding.js
new file mode 100644
index 0000000000..4e25ac2438
--- /dev/null
+++ b/test/built-ins/Temporal/PlainYearMonth/prototype/daysInMonth/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.plainyearmonth.prototype.daysinmonth
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const daysInMonth = Object.getOwnPropertyDescriptor(Temporal.PlainYearMonth.prototype, "daysInMonth").get;
+
+assert.sameValue(typeof daysInMonth, "function");
+
+assert.throws(TypeError, () => daysInMonth.call(undefined), "undefined");
+assert.throws(TypeError, () => daysInMonth.call(null), "null");
+assert.throws(TypeError, () => daysInMonth.call(true), "true");
+assert.throws(TypeError, () => daysInMonth.call(""), "empty string");
+assert.throws(TypeError, () => daysInMonth.call(Symbol()), "symbol");
+assert.throws(TypeError, () => daysInMonth.call(1), "1");
+assert.throws(TypeError, () => daysInMonth.call({}), "plain object");
+assert.throws(TypeError, () => daysInMonth.call(Temporal.PlainYearMonth), "Temporal.PlainYearMonth");
+assert.throws(TypeError, () => daysInMonth.call(Temporal.PlainYearMonth.prototype), "Temporal.PlainYearMonth.prototype");
diff --git a/test/built-ins/Temporal/PlainYearMonth/prototype/daysInYear/branding.js b/test/built-ins/Temporal/PlainYearMonth/prototype/daysInYear/branding.js
new file mode 100644
index 0000000000..89ed0ba7de
--- /dev/null
+++ b/test/built-ins/Temporal/PlainYearMonth/prototype/daysInYear/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.plainyearmonth.prototype.daysinyear
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const daysInYear = Object.getOwnPropertyDescriptor(Temporal.PlainYearMonth.prototype, "daysInYear").get;
+
+assert.sameValue(typeof daysInYear, "function");
+
+assert.throws(TypeError, () => daysInYear.call(undefined), "undefined");
+assert.throws(TypeError, () => daysInYear.call(null), "null");
+assert.throws(TypeError, () => daysInYear.call(true), "true");
+assert.throws(TypeError, () => daysInYear.call(""), "empty string");
+assert.throws(TypeError, () => daysInYear.call(Symbol()), "symbol");
+assert.throws(TypeError, () => daysInYear.call(1), "1");
+assert.throws(TypeError, () => daysInYear.call({}), "plain object");
+assert.throws(TypeError, () => daysInYear.call(Temporal.PlainYearMonth), "Temporal.PlainYearMonth");
+assert.throws(TypeError, () => daysInYear.call(Temporal.PlainYearMonth.prototype), "Temporal.PlainYearMonth.prototype");
diff --git a/test/built-ins/Temporal/PlainYearMonth/prototype/equals/branding.js b/test/built-ins/Temporal/PlainYearMonth/prototype/equals/branding.js
new file mode 100644
index 0000000000..b180108229
--- /dev/null
+++ b/test/built-ins/Temporal/PlainYearMonth/prototype/equals/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2020 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plainyearmonth.prototype.equals
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const equals = Temporal.PlainYearMonth.prototype.equals;
+
+assert.sameValue(typeof equals, "function");
+
+assert.throws(TypeError, () => equals.call(undefined), "undefined");
+assert.throws(TypeError, () => equals.call(null), "null");
+assert.throws(TypeError, () => equals.call(true), "true");
+assert.throws(TypeError, () => equals.call(""), "empty string");
+assert.throws(TypeError, () => equals.call(Symbol()), "symbol");
+assert.throws(TypeError, () => equals.call(1), "1");
+assert.throws(TypeError, () => equals.call({}), "plain object");
+assert.throws(TypeError, () => equals.call(Temporal.PlainYearMonth), "Temporal.PlainYearMonth");
+assert.throws(TypeError, () => equals.call(Temporal.PlainYearMonth.prototype), "Temporal.PlainYearMonth.prototype");
diff --git a/test/built-ins/Temporal/PlainYearMonth/prototype/era/branding.js b/test/built-ins/Temporal/PlainYearMonth/prototype/era/branding.js
new file mode 100644
index 0000000000..805de77423
--- /dev/null
+++ b/test/built-ins/Temporal/PlainYearMonth/prototype/era/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.plainyearmonth.prototype.era
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const era = Object.getOwnPropertyDescriptor(Temporal.PlainYearMonth.prototype, "era").get;
+
+assert.sameValue(typeof era, "function");
+
+assert.throws(TypeError, () => era.call(undefined), "undefined");
+assert.throws(TypeError, () => era.call(null), "null");
+assert.throws(TypeError, () => era.call(true), "true");
+assert.throws(TypeError, () => era.call(""), "empty string");
+assert.throws(TypeError, () => era.call(Symbol()), "symbol");
+assert.throws(TypeError, () => era.call(1), "1");
+assert.throws(TypeError, () => era.call({}), "plain object");
+assert.throws(TypeError, () => era.call(Temporal.PlainYearMonth), "Temporal.PlainYearMonth");
+assert.throws(TypeError, () => era.call(Temporal.PlainYearMonth.prototype), "Temporal.PlainYearMonth.prototype");
diff --git a/test/built-ins/Temporal/PlainYearMonth/prototype/eraYear/branding.js b/test/built-ins/Temporal/PlainYearMonth/prototype/eraYear/branding.js
new file mode 100644
index 0000000000..23717f31e6
--- /dev/null
+++ b/test/built-ins/Temporal/PlainYearMonth/prototype/eraYear/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.plainyearmonth.prototype.erayear
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const eraYear = Object.getOwnPropertyDescriptor(Temporal.PlainYearMonth.prototype, "eraYear").get;
+
+assert.sameValue(typeof eraYear, "function");
+
+assert.throws(TypeError, () => eraYear.call(undefined), "undefined");
+assert.throws(TypeError, () => eraYear.call(null), "null");
+assert.throws(TypeError, () => eraYear.call(true), "true");
+assert.throws(TypeError, () => eraYear.call(""), "empty string");
+assert.throws(TypeError, () => eraYear.call(Symbol()), "symbol");
+assert.throws(TypeError, () => eraYear.call(1), "1");
+assert.throws(TypeError, () => eraYear.call({}), "plain object");
+assert.throws(TypeError, () => eraYear.call(Temporal.PlainYearMonth), "Temporal.PlainYearMonth");
+assert.throws(TypeError, () => eraYear.call(Temporal.PlainYearMonth.prototype), "Temporal.PlainYearMonth.prototype");
diff --git a/test/built-ins/Temporal/PlainYearMonth/prototype/getISOFields/branding.js b/test/built-ins/Temporal/PlainYearMonth/prototype/getISOFields/branding.js
new file mode 100644
index 0000000000..88fe8f8e85
--- /dev/null
+++ b/test/built-ins/Temporal/PlainYearMonth/prototype/getISOFields/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2020 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plainyearmonth.prototype.getisofields
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const getISOFields = Temporal.PlainYearMonth.prototype.getISOFields;
+
+assert.sameValue(typeof getISOFields, "function");
+
+assert.throws(TypeError, () => getISOFields.call(undefined), "undefined");
+assert.throws(TypeError, () => getISOFields.call(null), "null");
+assert.throws(TypeError, () => getISOFields.call(true), "true");
+assert.throws(TypeError, () => getISOFields.call(""), "empty string");
+assert.throws(TypeError, () => getISOFields.call(Symbol()), "symbol");
+assert.throws(TypeError, () => getISOFields.call(1), "1");
+assert.throws(TypeError, () => getISOFields.call({}), "plain object");
+assert.throws(TypeError, () => getISOFields.call(Temporal.PlainYearMonth), "Temporal.PlainYearMonth");
+assert.throws(TypeError, () => getISOFields.call(Temporal.PlainYearMonth.prototype), "Temporal.PlainYearMonth.prototype");
diff --git a/test/built-ins/Temporal/PlainYearMonth/prototype/inLeapYear/branding.js b/test/built-ins/Temporal/PlainYearMonth/prototype/inLeapYear/branding.js
new file mode 100644
index 0000000000..ca4d439025
--- /dev/null
+++ b/test/built-ins/Temporal/PlainYearMonth/prototype/inLeapYear/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.plainyearmonth.prototype.inleapyear
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const inLeapYear = Object.getOwnPropertyDescriptor(Temporal.PlainYearMonth.prototype, "inLeapYear").get;
+
+assert.sameValue(typeof inLeapYear, "function");
+
+assert.throws(TypeError, () => inLeapYear.call(undefined), "undefined");
+assert.throws(TypeError, () => inLeapYear.call(null), "null");
+assert.throws(TypeError, () => inLeapYear.call(true), "true");
+assert.throws(TypeError, () => inLeapYear.call(""), "empty string");
+assert.throws(TypeError, () => inLeapYear.call(Symbol()), "symbol");
+assert.throws(TypeError, () => inLeapYear.call(1), "1");
+assert.throws(TypeError, () => inLeapYear.call({}), "plain object");
+assert.throws(TypeError, () => inLeapYear.call(Temporal.PlainYearMonth), "Temporal.PlainYearMonth");
+assert.throws(TypeError, () => inLeapYear.call(Temporal.PlainYearMonth.prototype), "Temporal.PlainYearMonth.prototype");
diff --git a/test/built-ins/Temporal/PlainYearMonth/prototype/month/branding.js b/test/built-ins/Temporal/PlainYearMonth/prototype/month/branding.js
new file mode 100644
index 0000000000..ff3991403b
--- /dev/null
+++ b/test/built-ins/Temporal/PlainYearMonth/prototype/month/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.plainyearmonth.prototype.month
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const month = Object.getOwnPropertyDescriptor(Temporal.PlainYearMonth.prototype, "month").get;
+
+assert.sameValue(typeof month, "function");
+
+assert.throws(TypeError, () => month.call(undefined), "undefined");
+assert.throws(TypeError, () => month.call(null), "null");
+assert.throws(TypeError, () => month.call(true), "true");
+assert.throws(TypeError, () => month.call(""), "empty string");
+assert.throws(TypeError, () => month.call(Symbol()), "symbol");
+assert.throws(TypeError, () => month.call(1), "1");
+assert.throws(TypeError, () => month.call({}), "plain object");
+assert.throws(TypeError, () => month.call(Temporal.PlainYearMonth), "Temporal.PlainYearMonth");
+assert.throws(TypeError, () => month.call(Temporal.PlainYearMonth.prototype), "Temporal.PlainYearMonth.prototype");
diff --git a/test/built-ins/Temporal/PlainYearMonth/prototype/monthCode/branding.js b/test/built-ins/Temporal/PlainYearMonth/prototype/monthCode/branding.js
new file mode 100644
index 0000000000..92ce886eb9
--- /dev/null
+++ b/test/built-ins/Temporal/PlainYearMonth/prototype/monthCode/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.plainyearmonth.prototype.monthcode
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const monthCode = Object.getOwnPropertyDescriptor(Temporal.PlainYearMonth.prototype, "monthCode").get;
+
+assert.sameValue(typeof monthCode, "function");
+
+assert.throws(TypeError, () => monthCode.call(undefined), "undefined");
+assert.throws(TypeError, () => monthCode.call(null), "null");
+assert.throws(TypeError, () => monthCode.call(true), "true");
+assert.throws(TypeError, () => monthCode.call(""), "empty string");
+assert.throws(TypeError, () => monthCode.call(Symbol()), "symbol");
+assert.throws(TypeError, () => monthCode.call(1), "1");
+assert.throws(TypeError, () => monthCode.call({}), "plain object");
+assert.throws(TypeError, () => monthCode.call(Temporal.PlainYearMonth), "Temporal.PlainYearMonth");
+assert.throws(TypeError, () => monthCode.call(Temporal.PlainYearMonth.prototype), "Temporal.PlainYearMonth.prototype");
diff --git a/test/built-ins/Temporal/PlainYearMonth/prototype/monthsInYear/branding.js b/test/built-ins/Temporal/PlainYearMonth/prototype/monthsInYear/branding.js
new file mode 100644
index 0000000000..51f5f1e096
--- /dev/null
+++ b/test/built-ins/Temporal/PlainYearMonth/prototype/monthsInYear/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.plainyearmonth.prototype.monthsinyear
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const monthsInYear = Object.getOwnPropertyDescriptor(Temporal.PlainYearMonth.prototype, "monthsInYear").get;
+
+assert.sameValue(typeof monthsInYear, "function");
+
+assert.throws(TypeError, () => monthsInYear.call(undefined), "undefined");
+assert.throws(TypeError, () => monthsInYear.call(null), "null");
+assert.throws(TypeError, () => monthsInYear.call(true), "true");
+assert.throws(TypeError, () => monthsInYear.call(""), "empty string");
+assert.throws(TypeError, () => monthsInYear.call(Symbol()), "symbol");
+assert.throws(TypeError, () => monthsInYear.call(1), "1");
+assert.throws(TypeError, () => monthsInYear.call({}), "plain object");
+assert.throws(TypeError, () => monthsInYear.call(Temporal.PlainYearMonth), "Temporal.PlainYearMonth");
+assert.throws(TypeError, () => monthsInYear.call(Temporal.PlainYearMonth.prototype), "Temporal.PlainYearMonth.prototype");
diff --git a/test/built-ins/Temporal/PlainYearMonth/prototype/since/branding.js b/test/built-ins/Temporal/PlainYearMonth/prototype/since/branding.js
new file mode 100644
index 0000000000..f7327b4124
--- /dev/null
+++ b/test/built-ins/Temporal/PlainYearMonth/prototype/since/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plainyearmonth.prototype.since
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const since = Temporal.PlainYearMonth.prototype.since;
+
+assert.sameValue(typeof since, "function");
+
+assert.throws(TypeError, () => since.call(undefined), "undefined");
+assert.throws(TypeError, () => since.call(null), "null");
+assert.throws(TypeError, () => since.call(true), "true");
+assert.throws(TypeError, () => since.call(""), "empty string");
+assert.throws(TypeError, () => since.call(Symbol()), "symbol");
+assert.throws(TypeError, () => since.call(1), "1");
+assert.throws(TypeError, () => since.call({}), "plain object");
+assert.throws(TypeError, () => since.call(Temporal.PlainYearMonth), "Temporal.PlainYearMonth");
+assert.throws(TypeError, () => since.call(Temporal.PlainYearMonth.prototype), "Temporal.PlainYearMonth.prototype");
diff --git a/test/built-ins/Temporal/PlainYearMonth/prototype/subtract/branding.js b/test/built-ins/Temporal/PlainYearMonth/prototype/subtract/branding.js
new file mode 100644
index 0000000000..cc60497b07
--- /dev/null
+++ b/test/built-ins/Temporal/PlainYearMonth/prototype/subtract/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plainyearmonth.prototype.subtract
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const subtract = Temporal.PlainYearMonth.prototype.subtract;
+
+assert.sameValue(typeof subtract, "function");
+
+assert.throws(TypeError, () => subtract.call(undefined), "undefined");
+assert.throws(TypeError, () => subtract.call(null), "null");
+assert.throws(TypeError, () => subtract.call(true), "true");
+assert.throws(TypeError, () => subtract.call(""), "empty string");
+assert.throws(TypeError, () => subtract.call(Symbol()), "symbol");
+assert.throws(TypeError, () => subtract.call(1), "1");
+assert.throws(TypeError, () => subtract.call({}), "plain object");
+assert.throws(TypeError, () => subtract.call(Temporal.PlainYearMonth), "Temporal.PlainYearMonth");
+assert.throws(TypeError, () => subtract.call(Temporal.PlainYearMonth.prototype), "Temporal.PlainYearMonth.prototype");
diff --git a/test/built-ins/Temporal/PlainYearMonth/prototype/toJSON/branding.js b/test/built-ins/Temporal/PlainYearMonth/prototype/toJSON/branding.js
new file mode 100644
index 0000000000..18aada90e6
--- /dev/null
+++ b/test/built-ins/Temporal/PlainYearMonth/prototype/toJSON/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plainyearmonth.prototype.tojson
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const toJSON = Temporal.PlainYearMonth.prototype.toJSON;
+
+assert.sameValue(typeof toJSON, "function");
+
+assert.throws(TypeError, () => toJSON.call(undefined), "undefined");
+assert.throws(TypeError, () => toJSON.call(null), "null");
+assert.throws(TypeError, () => toJSON.call(true), "true");
+assert.throws(TypeError, () => toJSON.call(""), "empty string");
+assert.throws(TypeError, () => toJSON.call(Symbol()), "symbol");
+assert.throws(TypeError, () => toJSON.call(1), "1");
+assert.throws(TypeError, () => toJSON.call({}), "plain object");
+assert.throws(TypeError, () => toJSON.call(Temporal.PlainYearMonth), "Temporal.PlainYearMonth");
+assert.throws(TypeError, () => toJSON.call(Temporal.PlainYearMonth.prototype), "Temporal.PlainYearMonth.prototype");
diff --git a/test/built-ins/Temporal/PlainYearMonth/prototype/toLocaleString/branding.js b/test/built-ins/Temporal/PlainYearMonth/prototype/toLocaleString/branding.js
new file mode 100644
index 0000000000..62f18afc6a
--- /dev/null
+++ b/test/built-ins/Temporal/PlainYearMonth/prototype/toLocaleString/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plainyearmonth.prototype.tolocalestring
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const toLocaleString = Temporal.PlainYearMonth.prototype.toLocaleString;
+
+assert.sameValue(typeof toLocaleString, "function");
+
+assert.throws(TypeError, () => toLocaleString.call(undefined), "undefined");
+assert.throws(TypeError, () => toLocaleString.call(null), "null");
+assert.throws(TypeError, () => toLocaleString.call(true), "true");
+assert.throws(TypeError, () => toLocaleString.call(""), "empty string");
+assert.throws(TypeError, () => toLocaleString.call(Symbol()), "symbol");
+assert.throws(TypeError, () => toLocaleString.call(1), "1");
+assert.throws(TypeError, () => toLocaleString.call({}), "plain object");
+assert.throws(TypeError, () => toLocaleString.call(Temporal.PlainYearMonth), "Temporal.PlainYearMonth");
+assert.throws(TypeError, () => toLocaleString.call(Temporal.PlainYearMonth.prototype), "Temporal.PlainYearMonth.prototype");
diff --git a/test/built-ins/Temporal/PlainYearMonth/prototype/toPlainDate/branding.js b/test/built-ins/Temporal/PlainYearMonth/prototype/toPlainDate/branding.js
new file mode 100644
index 0000000000..67d16016cb
--- /dev/null
+++ b/test/built-ins/Temporal/PlainYearMonth/prototype/toPlainDate/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plainyearmonth.prototype.toplaindate
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const toPlainDate = Temporal.PlainYearMonth.prototype.toPlainDate;
+
+assert.sameValue(typeof toPlainDate, "function");
+
+assert.throws(TypeError, () => toPlainDate.call(undefined), "undefined");
+assert.throws(TypeError, () => toPlainDate.call(null), "null");
+assert.throws(TypeError, () => toPlainDate.call(true), "true");
+assert.throws(TypeError, () => toPlainDate.call(""), "empty string");
+assert.throws(TypeError, () => toPlainDate.call(Symbol()), "symbol");
+assert.throws(TypeError, () => toPlainDate.call(1), "1");
+assert.throws(TypeError, () => toPlainDate.call({}), "plain object");
+assert.throws(TypeError, () => toPlainDate.call(Temporal.PlainYearMonth), "Temporal.PlainYearMonth");
+assert.throws(TypeError, () => toPlainDate.call(Temporal.PlainYearMonth.prototype), "Temporal.PlainYearMonth.prototype");
diff --git a/test/built-ins/Temporal/PlainYearMonth/prototype/toString/branding.js b/test/built-ins/Temporal/PlainYearMonth/prototype/toString/branding.js
new file mode 100644
index 0000000000..8f756e98bb
--- /dev/null
+++ b/test/built-ins/Temporal/PlainYearMonth/prototype/toString/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plainyearmonth.prototype.tostring
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const toString = Temporal.PlainYearMonth.prototype.toString;
+
+assert.sameValue(typeof toString, "function");
+
+assert.throws(TypeError, () => toString.call(undefined), "undefined");
+assert.throws(TypeError, () => toString.call(null), "null");
+assert.throws(TypeError, () => toString.call(true), "true");
+assert.throws(TypeError, () => toString.call(""), "empty string");
+assert.throws(TypeError, () => toString.call(Symbol()), "symbol");
+assert.throws(TypeError, () => toString.call(1), "1");
+assert.throws(TypeError, () => toString.call({}), "plain object");
+assert.throws(TypeError, () => toString.call(Temporal.PlainYearMonth), "Temporal.PlainYearMonth");
+assert.throws(TypeError, () => toString.call(Temporal.PlainYearMonth.prototype), "Temporal.PlainYearMonth.prototype");
diff --git a/test/built-ins/Temporal/PlainYearMonth/prototype/until/branding.js b/test/built-ins/Temporal/PlainYearMonth/prototype/until/branding.js
new file mode 100644
index 0000000000..4487e20d8d
--- /dev/null
+++ b/test/built-ins/Temporal/PlainYearMonth/prototype/until/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plainyearmonth.prototype.until
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const until = Temporal.PlainYearMonth.prototype.until;
+
+assert.sameValue(typeof until, "function");
+
+assert.throws(TypeError, () => until.call(undefined), "undefined");
+assert.throws(TypeError, () => until.call(null), "null");
+assert.throws(TypeError, () => until.call(true), "true");
+assert.throws(TypeError, () => until.call(""), "empty string");
+assert.throws(TypeError, () => until.call(Symbol()), "symbol");
+assert.throws(TypeError, () => until.call(1), "1");
+assert.throws(TypeError, () => until.call({}), "plain object");
+assert.throws(TypeError, () => until.call(Temporal.PlainYearMonth), "Temporal.PlainYearMonth");
+assert.throws(TypeError, () => until.call(Temporal.PlainYearMonth.prototype), "Temporal.PlainYearMonth.prototype");
diff --git a/test/built-ins/Temporal/PlainYearMonth/prototype/valueOf/branding.js b/test/built-ins/Temporal/PlainYearMonth/prototype/valueOf/branding.js
new file mode 100644
index 0000000000..a524512d8f
--- /dev/null
+++ b/test/built-ins/Temporal/PlainYearMonth/prototype/valueOf/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plainyearmonth.prototype.valueof
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const valueOf = Temporal.PlainYearMonth.prototype.valueOf;
+
+assert.sameValue(typeof valueOf, "function");
+
+assert.throws(TypeError, () => valueOf.call(undefined), "undefined");
+assert.throws(TypeError, () => valueOf.call(null), "null");
+assert.throws(TypeError, () => valueOf.call(true), "true");
+assert.throws(TypeError, () => valueOf.call(""), "empty string");
+assert.throws(TypeError, () => valueOf.call(Symbol()), "symbol");
+assert.throws(TypeError, () => valueOf.call(1), "1");
+assert.throws(TypeError, () => valueOf.call({}), "plain object");
+assert.throws(TypeError, () => valueOf.call(Temporal.PlainYearMonth), "Temporal.PlainYearMonth");
+assert.throws(TypeError, () => valueOf.call(Temporal.PlainYearMonth.prototype), "Temporal.PlainYearMonth.prototype");
diff --git a/test/built-ins/Temporal/PlainYearMonth/prototype/with/branding.js b/test/built-ins/Temporal/PlainYearMonth/prototype/with/branding.js
new file mode 100644
index 0000000000..131d9f8c2e
--- /dev/null
+++ b/test/built-ins/Temporal/PlainYearMonth/prototype/with/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plainyearmonth.prototype.with
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const with_ = Temporal.PlainYearMonth.prototype.with;
+
+assert.sameValue(typeof with_, "function");
+
+assert.throws(TypeError, () => with_.call(undefined), "undefined");
+assert.throws(TypeError, () => with_.call(null), "null");
+assert.throws(TypeError, () => with_.call(true), "true");
+assert.throws(TypeError, () => with_.call(""), "empty string");
+assert.throws(TypeError, () => with_.call(Symbol()), "symbol");
+assert.throws(TypeError, () => with_.call(1), "1");
+assert.throws(TypeError, () => with_.call({}), "plain object");
+assert.throws(TypeError, () => with_.call(Temporal.PlainYearMonth), "Temporal.PlainYearMonth");
+assert.throws(TypeError, () => with_.call(Temporal.PlainYearMonth.prototype), "Temporal.PlainYearMonth.prototype");
diff --git a/test/built-ins/Temporal/PlainYearMonth/prototype/year/branding.js b/test/built-ins/Temporal/PlainYearMonth/prototype/year/branding.js
new file mode 100644
index 0000000000..5e95acd81e
--- /dev/null
+++ b/test/built-ins/Temporal/PlainYearMonth/prototype/year/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.plainyearmonth.prototype.year
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const year = Object.getOwnPropertyDescriptor(Temporal.PlainYearMonth.prototype, "year").get;
+
+assert.sameValue(typeof year, "function");
+
+assert.throws(TypeError, () => year.call(undefined), "undefined");
+assert.throws(TypeError, () => year.call(null), "null");
+assert.throws(TypeError, () => year.call(true), "true");
+assert.throws(TypeError, () => year.call(""), "empty string");
+assert.throws(TypeError, () => year.call(Symbol()), "symbol");
+assert.throws(TypeError, () => year.call(1), "1");
+assert.throws(TypeError, () => year.call({}), "plain object");
+assert.throws(TypeError, () => year.call(Temporal.PlainYearMonth), "Temporal.PlainYearMonth");
+assert.throws(TypeError, () => year.call(Temporal.PlainYearMonth.prototype), "Temporal.PlainYearMonth.prototype");
diff --git a/test/built-ins/Temporal/TimeZone/prototype/getInstantFor/branding.js b/test/built-ins/Temporal/TimeZone/prototype/getInstantFor/branding.js
new file mode 100644
index 0000000000..b8c570cadc
--- /dev/null
+++ b/test/built-ins/Temporal/TimeZone/prototype/getInstantFor/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.timezone.prototype.getinstantfor
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const getInstantFor = Temporal.TimeZone.prototype.getInstantFor;
+
+assert.sameValue(typeof getInstantFor, "function");
+
+assert.throws(TypeError, () => getInstantFor.call(undefined), "undefined");
+assert.throws(TypeError, () => getInstantFor.call(null), "null");
+assert.throws(TypeError, () => getInstantFor.call(true), "true");
+assert.throws(TypeError, () => getInstantFor.call(""), "empty string");
+assert.throws(TypeError, () => getInstantFor.call(Symbol()), "symbol");
+assert.throws(TypeError, () => getInstantFor.call(1), "1");
+assert.throws(TypeError, () => getInstantFor.call({}), "plain object");
+assert.throws(TypeError, () => getInstantFor.call(Temporal.TimeZone), "Temporal.TimeZone");
+assert.throws(TypeError, () => getInstantFor.call(Temporal.TimeZone.prototype), "Temporal.TimeZone.prototype");
diff --git a/test/built-ins/Temporal/TimeZone/prototype/getNextTransition/branding.js b/test/built-ins/Temporal/TimeZone/prototype/getNextTransition/branding.js
new file mode 100644
index 0000000000..6a53945fab
--- /dev/null
+++ b/test/built-ins/Temporal/TimeZone/prototype/getNextTransition/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.timezone.prototype.getnexttransition
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const getNextTransition = Temporal.TimeZone.prototype.getNextTransition;
+
+assert.sameValue(typeof getNextTransition, "function");
+
+assert.throws(TypeError, () => getNextTransition.call(undefined), "undefined");
+assert.throws(TypeError, () => getNextTransition.call(null), "null");
+assert.throws(TypeError, () => getNextTransition.call(true), "true");
+assert.throws(TypeError, () => getNextTransition.call(""), "empty string");
+assert.throws(TypeError, () => getNextTransition.call(Symbol()), "symbol");
+assert.throws(TypeError, () => getNextTransition.call(1), "1");
+assert.throws(TypeError, () => getNextTransition.call({}), "plain object");
+assert.throws(TypeError, () => getNextTransition.call(Temporal.TimeZone), "Temporal.TimeZone");
+assert.throws(TypeError, () => getNextTransition.call(Temporal.TimeZone.prototype), "Temporal.TimeZone.prototype");
diff --git a/test/built-ins/Temporal/TimeZone/prototype/getOffsetNanosecondsFor/branding.js b/test/built-ins/Temporal/TimeZone/prototype/getOffsetNanosecondsFor/branding.js
new file mode 100644
index 0000000000..a63ebda0f7
--- /dev/null
+++ b/test/built-ins/Temporal/TimeZone/prototype/getOffsetNanosecondsFor/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2020 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.timezone.prototype.getoffsetnanosecondsfor
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const getOffsetNanosecondsFor = Temporal.TimeZone.prototype.getOffsetNanosecondsFor;
+
+assert.sameValue(typeof getOffsetNanosecondsFor, "function");
+
+assert.throws(TypeError, () => getOffsetNanosecondsFor.call(undefined), "undefined");
+assert.throws(TypeError, () => getOffsetNanosecondsFor.call(null), "null");
+assert.throws(TypeError, () => getOffsetNanosecondsFor.call(true), "true");
+assert.throws(TypeError, () => getOffsetNanosecondsFor.call(""), "empty string");
+assert.throws(TypeError, () => getOffsetNanosecondsFor.call(Symbol()), "symbol");
+assert.throws(TypeError, () => getOffsetNanosecondsFor.call(1), "1");
+assert.throws(TypeError, () => getOffsetNanosecondsFor.call({}), "plain object");
+assert.throws(TypeError, () => getOffsetNanosecondsFor.call(Temporal.TimeZone), "Temporal.TimeZone");
+assert.throws(TypeError, () => getOffsetNanosecondsFor.call(Temporal.TimeZone.prototype), "Temporal.TimeZone.prototype");
diff --git a/test/built-ins/Temporal/TimeZone/prototype/getOffsetStringFor/branding.js b/test/built-ins/Temporal/TimeZone/prototype/getOffsetStringFor/branding.js
new file mode 100644
index 0000000000..0fc6c49806
--- /dev/null
+++ b/test/built-ins/Temporal/TimeZone/prototype/getOffsetStringFor/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.timezone.prototype.getoffsetstringfor
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const getOffsetStringFor = Temporal.TimeZone.prototype.getOffsetStringFor;
+
+assert.sameValue(typeof getOffsetStringFor, "function");
+
+assert.throws(TypeError, () => getOffsetStringFor.call(undefined), "undefined");
+assert.throws(TypeError, () => getOffsetStringFor.call(null), "null");
+assert.throws(TypeError, () => getOffsetStringFor.call(true), "true");
+assert.throws(TypeError, () => getOffsetStringFor.call(""), "empty string");
+assert.throws(TypeError, () => getOffsetStringFor.call(Symbol()), "symbol");
+assert.throws(TypeError, () => getOffsetStringFor.call(1), "1");
+assert.throws(TypeError, () => getOffsetStringFor.call({}), "plain object");
+assert.throws(TypeError, () => getOffsetStringFor.call(Temporal.TimeZone), "Temporal.TimeZone");
+assert.throws(TypeError, () => getOffsetStringFor.call(Temporal.TimeZone.prototype), "Temporal.TimeZone.prototype");
diff --git a/test/built-ins/Temporal/TimeZone/prototype/getPossibleInstantsFor/branding.js b/test/built-ins/Temporal/TimeZone/prototype/getPossibleInstantsFor/branding.js
new file mode 100644
index 0000000000..431d3c520a
--- /dev/null
+++ b/test/built-ins/Temporal/TimeZone/prototype/getPossibleInstantsFor/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2020 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.timezone.prototype.getpossibleinstantsfor
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const getPossibleInstantsFor = Temporal.TimeZone.prototype.getPossibleInstantsFor;
+
+assert.sameValue(typeof getPossibleInstantsFor, "function");
+
+assert.throws(TypeError, () => getPossibleInstantsFor.call(undefined), "undefined");
+assert.throws(TypeError, () => getPossibleInstantsFor.call(null), "null");
+assert.throws(TypeError, () => getPossibleInstantsFor.call(true), "true");
+assert.throws(TypeError, () => getPossibleInstantsFor.call(""), "empty string");
+assert.throws(TypeError, () => getPossibleInstantsFor.call(Symbol()), "symbol");
+assert.throws(TypeError, () => getPossibleInstantsFor.call(1), "1");
+assert.throws(TypeError, () => getPossibleInstantsFor.call({}), "plain object");
+assert.throws(TypeError, () => getPossibleInstantsFor.call(Temporal.TimeZone), "Temporal.TimeZone");
+assert.throws(TypeError, () => getPossibleInstantsFor.call(Temporal.TimeZone.prototype), "Temporal.TimeZone.prototype");
diff --git a/test/built-ins/Temporal/TimeZone/prototype/getPreviousTransition/branding.js b/test/built-ins/Temporal/TimeZone/prototype/getPreviousTransition/branding.js
new file mode 100644
index 0000000000..eaa3530e46
--- /dev/null
+++ b/test/built-ins/Temporal/TimeZone/prototype/getPreviousTransition/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.timezone.prototype.getprevioustransition
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const getPreviousTransition = Temporal.TimeZone.prototype.getPreviousTransition;
+
+assert.sameValue(typeof getPreviousTransition, "function");
+
+assert.throws(TypeError, () => getPreviousTransition.call(undefined), "undefined");
+assert.throws(TypeError, () => getPreviousTransition.call(null), "null");
+assert.throws(TypeError, () => getPreviousTransition.call(true), "true");
+assert.throws(TypeError, () => getPreviousTransition.call(""), "empty string");
+assert.throws(TypeError, () => getPreviousTransition.call(Symbol()), "symbol");
+assert.throws(TypeError, () => getPreviousTransition.call(1), "1");
+assert.throws(TypeError, () => getPreviousTransition.call({}), "plain object");
+assert.throws(TypeError, () => getPreviousTransition.call(Temporal.TimeZone), "Temporal.TimeZone");
+assert.throws(TypeError, () => getPreviousTransition.call(Temporal.TimeZone.prototype), "Temporal.TimeZone.prototype");
diff --git a/test/built-ins/Temporal/TimeZone/prototype/toString/branding.js b/test/built-ins/Temporal/TimeZone/prototype/toString/branding.js
new file mode 100644
index 0000000000..ab7654cc73
--- /dev/null
+++ b/test/built-ins/Temporal/TimeZone/prototype/toString/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.timezone.prototype.tostring
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const toString = Temporal.TimeZone.prototype.toString;
+
+assert.sameValue(typeof toString, "function");
+
+assert.throws(TypeError, () => toString.call(undefined), "undefined");
+assert.throws(TypeError, () => toString.call(null), "null");
+assert.throws(TypeError, () => toString.call(true), "true");
+assert.throws(TypeError, () => toString.call(""), "empty string");
+assert.throws(TypeError, () => toString.call(Symbol()), "symbol");
+assert.throws(TypeError, () => toString.call(1), "1");
+assert.throws(TypeError, () => toString.call({}), "plain object");
+assert.throws(TypeError, () => toString.call(Temporal.TimeZone), "Temporal.TimeZone");
+assert.throws(TypeError, () => toString.call(Temporal.TimeZone.prototype), "Temporal.TimeZone.prototype");
diff --git a/test/built-ins/Temporal/ZonedDateTime/prototype/add/branding.js b/test/built-ins/Temporal/ZonedDateTime/prototype/add/branding.js
new file mode 100644
index 0000000000..c9dc587495
--- /dev/null
+++ b/test/built-ins/Temporal/ZonedDateTime/prototype/add/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.zoneddatetime.prototype.add
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const add = Temporal.ZonedDateTime.prototype.add;
+
+assert.sameValue(typeof add, "function");
+
+assert.throws(TypeError, () => add.call(undefined), "undefined");
+assert.throws(TypeError, () => add.call(null), "null");
+assert.throws(TypeError, () => add.call(true), "true");
+assert.throws(TypeError, () => add.call(""), "empty string");
+assert.throws(TypeError, () => add.call(Symbol()), "symbol");
+assert.throws(TypeError, () => add.call(1), "1");
+assert.throws(TypeError, () => add.call({}), "plain object");
+assert.throws(TypeError, () => add.call(Temporal.ZonedDateTime), "Temporal.ZonedDateTime");
+assert.throws(TypeError, () => add.call(Temporal.ZonedDateTime.prototype), "Temporal.ZonedDateTime.prototype");
diff --git a/test/built-ins/Temporal/ZonedDateTime/prototype/calendar/branding.js b/test/built-ins/Temporal/ZonedDateTime/prototype/calendar/branding.js
new file mode 100644
index 0000000000..ba792ca71a
--- /dev/null
+++ b/test/built-ins/Temporal/ZonedDateTime/prototype/calendar/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.zoneddatetime.prototype.calendar
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const calendar = Object.getOwnPropertyDescriptor(Temporal.ZonedDateTime.prototype, "calendar").get;
+
+assert.sameValue(typeof calendar, "function");
+
+assert.throws(TypeError, () => calendar.call(undefined), "undefined");
+assert.throws(TypeError, () => calendar.call(null), "null");
+assert.throws(TypeError, () => calendar.call(true), "true");
+assert.throws(TypeError, () => calendar.call(""), "empty string");
+assert.throws(TypeError, () => calendar.call(Symbol()), "symbol");
+assert.throws(TypeError, () => calendar.call(1), "1");
+assert.throws(TypeError, () => calendar.call({}), "plain object");
+assert.throws(TypeError, () => calendar.call(Temporal.ZonedDateTime), "Temporal.ZonedDateTime");
+assert.throws(TypeError, () => calendar.call(Temporal.ZonedDateTime.prototype), "Temporal.ZonedDateTime.prototype");
diff --git a/test/built-ins/Temporal/ZonedDateTime/prototype/day/branding.js b/test/built-ins/Temporal/ZonedDateTime/prototype/day/branding.js
new file mode 100644
index 0000000000..adf6c9ed74
--- /dev/null
+++ b/test/built-ins/Temporal/ZonedDateTime/prototype/day/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.zoneddatetime.prototype.day
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const day = Object.getOwnPropertyDescriptor(Temporal.ZonedDateTime.prototype, "day").get;
+
+assert.sameValue(typeof day, "function");
+
+assert.throws(TypeError, () => day.call(undefined), "undefined");
+assert.throws(TypeError, () => day.call(null), "null");
+assert.throws(TypeError, () => day.call(true), "true");
+assert.throws(TypeError, () => day.call(""), "empty string");
+assert.throws(TypeError, () => day.call(Symbol()), "symbol");
+assert.throws(TypeError, () => day.call(1), "1");
+assert.throws(TypeError, () => day.call({}), "plain object");
+assert.throws(TypeError, () => day.call(Temporal.ZonedDateTime), "Temporal.ZonedDateTime");
+assert.throws(TypeError, () => day.call(Temporal.ZonedDateTime.prototype), "Temporal.ZonedDateTime.prototype");
diff --git a/test/built-ins/Temporal/ZonedDateTime/prototype/dayOfWeek/branding.js b/test/built-ins/Temporal/ZonedDateTime/prototype/dayOfWeek/branding.js
new file mode 100644
index 0000000000..e626ec9e31
--- /dev/null
+++ b/test/built-ins/Temporal/ZonedDateTime/prototype/dayOfWeek/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.zoneddatetime.prototype.dayofweek
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const dayOfWeek = Object.getOwnPropertyDescriptor(Temporal.ZonedDateTime.prototype, "dayOfWeek").get;
+
+assert.sameValue(typeof dayOfWeek, "function");
+
+assert.throws(TypeError, () => dayOfWeek.call(undefined), "undefined");
+assert.throws(TypeError, () => dayOfWeek.call(null), "null");
+assert.throws(TypeError, () => dayOfWeek.call(true), "true");
+assert.throws(TypeError, () => dayOfWeek.call(""), "empty string");
+assert.throws(TypeError, () => dayOfWeek.call(Symbol()), "symbol");
+assert.throws(TypeError, () => dayOfWeek.call(1), "1");
+assert.throws(TypeError, () => dayOfWeek.call({}), "plain object");
+assert.throws(TypeError, () => dayOfWeek.call(Temporal.ZonedDateTime), "Temporal.ZonedDateTime");
+assert.throws(TypeError, () => dayOfWeek.call(Temporal.ZonedDateTime.prototype), "Temporal.ZonedDateTime.prototype");
diff --git a/test/built-ins/Temporal/ZonedDateTime/prototype/dayOfYear/branding.js b/test/built-ins/Temporal/ZonedDateTime/prototype/dayOfYear/branding.js
new file mode 100644
index 0000000000..c593cb34ce
--- /dev/null
+++ b/test/built-ins/Temporal/ZonedDateTime/prototype/dayOfYear/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.zoneddatetime.prototype.dayofyear
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const dayOfYear = Object.getOwnPropertyDescriptor(Temporal.ZonedDateTime.prototype, "dayOfYear").get;
+
+assert.sameValue(typeof dayOfYear, "function");
+
+assert.throws(TypeError, () => dayOfYear.call(undefined), "undefined");
+assert.throws(TypeError, () => dayOfYear.call(null), "null");
+assert.throws(TypeError, () => dayOfYear.call(true), "true");
+assert.throws(TypeError, () => dayOfYear.call(""), "empty string");
+assert.throws(TypeError, () => dayOfYear.call(Symbol()), "symbol");
+assert.throws(TypeError, () => dayOfYear.call(1), "1");
+assert.throws(TypeError, () => dayOfYear.call({}), "plain object");
+assert.throws(TypeError, () => dayOfYear.call(Temporal.ZonedDateTime), "Temporal.ZonedDateTime");
+assert.throws(TypeError, () => dayOfYear.call(Temporal.ZonedDateTime.prototype), "Temporal.ZonedDateTime.prototype");
diff --git a/test/built-ins/Temporal/ZonedDateTime/prototype/daysInMonth/branding.js b/test/built-ins/Temporal/ZonedDateTime/prototype/daysInMonth/branding.js
new file mode 100644
index 0000000000..710147ec8d
--- /dev/null
+++ b/test/built-ins/Temporal/ZonedDateTime/prototype/daysInMonth/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.zoneddatetime.prototype.daysinmonth
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const daysInMonth = Object.getOwnPropertyDescriptor(Temporal.ZonedDateTime.prototype, "daysInMonth").get;
+
+assert.sameValue(typeof daysInMonth, "function");
+
+assert.throws(TypeError, () => daysInMonth.call(undefined), "undefined");
+assert.throws(TypeError, () => daysInMonth.call(null), "null");
+assert.throws(TypeError, () => daysInMonth.call(true), "true");
+assert.throws(TypeError, () => daysInMonth.call(""), "empty string");
+assert.throws(TypeError, () => daysInMonth.call(Symbol()), "symbol");
+assert.throws(TypeError, () => daysInMonth.call(1), "1");
+assert.throws(TypeError, () => daysInMonth.call({}), "plain object");
+assert.throws(TypeError, () => daysInMonth.call(Temporal.ZonedDateTime), "Temporal.ZonedDateTime");
+assert.throws(TypeError, () => daysInMonth.call(Temporal.ZonedDateTime.prototype), "Temporal.ZonedDateTime.prototype");
diff --git a/test/built-ins/Temporal/ZonedDateTime/prototype/daysInWeek/branding.js b/test/built-ins/Temporal/ZonedDateTime/prototype/daysInWeek/branding.js
new file mode 100644
index 0000000000..f385d8b326
--- /dev/null
+++ b/test/built-ins/Temporal/ZonedDateTime/prototype/daysInWeek/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.zoneddatetime.prototype.daysinweek
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const daysInWeek = Object.getOwnPropertyDescriptor(Temporal.ZonedDateTime.prototype, "daysInWeek").get;
+
+assert.sameValue(typeof daysInWeek, "function");
+
+assert.throws(TypeError, () => daysInWeek.call(undefined), "undefined");
+assert.throws(TypeError, () => daysInWeek.call(null), "null");
+assert.throws(TypeError, () => daysInWeek.call(true), "true");
+assert.throws(TypeError, () => daysInWeek.call(""), "empty string");
+assert.throws(TypeError, () => daysInWeek.call(Symbol()), "symbol");
+assert.throws(TypeError, () => daysInWeek.call(1), "1");
+assert.throws(TypeError, () => daysInWeek.call({}), "plain object");
+assert.throws(TypeError, () => daysInWeek.call(Temporal.ZonedDateTime), "Temporal.ZonedDateTime");
+assert.throws(TypeError, () => daysInWeek.call(Temporal.ZonedDateTime.prototype), "Temporal.ZonedDateTime.prototype");
diff --git a/test/built-ins/Temporal/ZonedDateTime/prototype/daysInYear/branding.js b/test/built-ins/Temporal/ZonedDateTime/prototype/daysInYear/branding.js
new file mode 100644
index 0000000000..6720659c20
--- /dev/null
+++ b/test/built-ins/Temporal/ZonedDateTime/prototype/daysInYear/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.zoneddatetime.prototype.daysinyear
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const daysInYear = Object.getOwnPropertyDescriptor(Temporal.ZonedDateTime.prototype, "daysInYear").get;
+
+assert.sameValue(typeof daysInYear, "function");
+
+assert.throws(TypeError, () => daysInYear.call(undefined), "undefined");
+assert.throws(TypeError, () => daysInYear.call(null), "null");
+assert.throws(TypeError, () => daysInYear.call(true), "true");
+assert.throws(TypeError, () => daysInYear.call(""), "empty string");
+assert.throws(TypeError, () => daysInYear.call(Symbol()), "symbol");
+assert.throws(TypeError, () => daysInYear.call(1), "1");
+assert.throws(TypeError, () => daysInYear.call({}), "plain object");
+assert.throws(TypeError, () => daysInYear.call(Temporal.ZonedDateTime), "Temporal.ZonedDateTime");
+assert.throws(TypeError, () => daysInYear.call(Temporal.ZonedDateTime.prototype), "Temporal.ZonedDateTime.prototype");
diff --git a/test/built-ins/Temporal/ZonedDateTime/prototype/epochMicroseconds/branding.js b/test/built-ins/Temporal/ZonedDateTime/prototype/epochMicroseconds/branding.js
new file mode 100644
index 0000000000..5957b64c80
--- /dev/null
+++ b/test/built-ins/Temporal/ZonedDateTime/prototype/epochMicroseconds/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.zoneddatetime.prototype.epochmicroseconds
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const epochMicroseconds = Object.getOwnPropertyDescriptor(Temporal.ZonedDateTime.prototype, "epochMicroseconds").get;
+
+assert.sameValue(typeof epochMicroseconds, "function");
+
+assert.throws(TypeError, () => epochMicroseconds.call(undefined), "undefined");
+assert.throws(TypeError, () => epochMicroseconds.call(null), "null");
+assert.throws(TypeError, () => epochMicroseconds.call(true), "true");
+assert.throws(TypeError, () => epochMicroseconds.call(""), "empty string");
+assert.throws(TypeError, () => epochMicroseconds.call(Symbol()), "symbol");
+assert.throws(TypeError, () => epochMicroseconds.call(1), "1");
+assert.throws(TypeError, () => epochMicroseconds.call({}), "plain object");
+assert.throws(TypeError, () => epochMicroseconds.call(Temporal.ZonedDateTime), "Temporal.ZonedDateTime");
+assert.throws(TypeError, () => epochMicroseconds.call(Temporal.ZonedDateTime.prototype), "Temporal.ZonedDateTime.prototype");
diff --git a/test/built-ins/Temporal/ZonedDateTime/prototype/epochMilliseconds/branding.js b/test/built-ins/Temporal/ZonedDateTime/prototype/epochMilliseconds/branding.js
new file mode 100644
index 0000000000..091e0ad84c
--- /dev/null
+++ b/test/built-ins/Temporal/ZonedDateTime/prototype/epochMilliseconds/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.zoneddatetime.prototype.epochmilliseconds
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const epochMilliseconds = Object.getOwnPropertyDescriptor(Temporal.ZonedDateTime.prototype, "epochMilliseconds").get;
+
+assert.sameValue(typeof epochMilliseconds, "function");
+
+assert.throws(TypeError, () => epochMilliseconds.call(undefined), "undefined");
+assert.throws(TypeError, () => epochMilliseconds.call(null), "null");
+assert.throws(TypeError, () => epochMilliseconds.call(true), "true");
+assert.throws(TypeError, () => epochMilliseconds.call(""), "empty string");
+assert.throws(TypeError, () => epochMilliseconds.call(Symbol()), "symbol");
+assert.throws(TypeError, () => epochMilliseconds.call(1), "1");
+assert.throws(TypeError, () => epochMilliseconds.call({}), "plain object");
+assert.throws(TypeError, () => epochMilliseconds.call(Temporal.ZonedDateTime), "Temporal.ZonedDateTime");
+assert.throws(TypeError, () => epochMilliseconds.call(Temporal.ZonedDateTime.prototype), "Temporal.ZonedDateTime.prototype");
diff --git a/test/built-ins/Temporal/ZonedDateTime/prototype/epochNanoseconds/branding.js b/test/built-ins/Temporal/ZonedDateTime/prototype/epochNanoseconds/branding.js
new file mode 100644
index 0000000000..39fb55a8c5
--- /dev/null
+++ b/test/built-ins/Temporal/ZonedDateTime/prototype/epochNanoseconds/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.zoneddatetime.prototype.epochnanoseconds
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const epochNanoseconds = Object.getOwnPropertyDescriptor(Temporal.ZonedDateTime.prototype, "epochNanoseconds").get;
+
+assert.sameValue(typeof epochNanoseconds, "function");
+
+assert.throws(TypeError, () => epochNanoseconds.call(undefined), "undefined");
+assert.throws(TypeError, () => epochNanoseconds.call(null), "null");
+assert.throws(TypeError, () => epochNanoseconds.call(true), "true");
+assert.throws(TypeError, () => epochNanoseconds.call(""), "empty string");
+assert.throws(TypeError, () => epochNanoseconds.call(Symbol()), "symbol");
+assert.throws(TypeError, () => epochNanoseconds.call(1), "1");
+assert.throws(TypeError, () => epochNanoseconds.call({}), "plain object");
+assert.throws(TypeError, () => epochNanoseconds.call(Temporal.ZonedDateTime), "Temporal.ZonedDateTime");
+assert.throws(TypeError, () => epochNanoseconds.call(Temporal.ZonedDateTime.prototype), "Temporal.ZonedDateTime.prototype");
diff --git a/test/built-ins/Temporal/ZonedDateTime/prototype/epochSeconds/branding.js b/test/built-ins/Temporal/ZonedDateTime/prototype/epochSeconds/branding.js
new file mode 100644
index 0000000000..9f68f73d1e
--- /dev/null
+++ b/test/built-ins/Temporal/ZonedDateTime/prototype/epochSeconds/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.zoneddatetime.prototype.epochseconds
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const epochSeconds = Object.getOwnPropertyDescriptor(Temporal.ZonedDateTime.prototype, "epochSeconds").get;
+
+assert.sameValue(typeof epochSeconds, "function");
+
+assert.throws(TypeError, () => epochSeconds.call(undefined), "undefined");
+assert.throws(TypeError, () => epochSeconds.call(null), "null");
+assert.throws(TypeError, () => epochSeconds.call(true), "true");
+assert.throws(TypeError, () => epochSeconds.call(""), "empty string");
+assert.throws(TypeError, () => epochSeconds.call(Symbol()), "symbol");
+assert.throws(TypeError, () => epochSeconds.call(1), "1");
+assert.throws(TypeError, () => epochSeconds.call({}), "plain object");
+assert.throws(TypeError, () => epochSeconds.call(Temporal.ZonedDateTime), "Temporal.ZonedDateTime");
+assert.throws(TypeError, () => epochSeconds.call(Temporal.ZonedDateTime.prototype), "Temporal.ZonedDateTime.prototype");
diff --git a/test/built-ins/Temporal/ZonedDateTime/prototype/equals/branding.js b/test/built-ins/Temporal/ZonedDateTime/prototype/equals/branding.js
new file mode 100644
index 0000000000..05705c4d7c
--- /dev/null
+++ b/test/built-ins/Temporal/ZonedDateTime/prototype/equals/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.zoneddatetime.prototype.equals
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const equals = Temporal.ZonedDateTime.prototype.equals;
+
+assert.sameValue(typeof equals, "function");
+
+assert.throws(TypeError, () => equals.call(undefined), "undefined");
+assert.throws(TypeError, () => equals.call(null), "null");
+assert.throws(TypeError, () => equals.call(true), "true");
+assert.throws(TypeError, () => equals.call(""), "empty string");
+assert.throws(TypeError, () => equals.call(Symbol()), "symbol");
+assert.throws(TypeError, () => equals.call(1), "1");
+assert.throws(TypeError, () => equals.call({}), "plain object");
+assert.throws(TypeError, () => equals.call(Temporal.ZonedDateTime), "Temporal.ZonedDateTime");
+assert.throws(TypeError, () => equals.call(Temporal.ZonedDateTime.prototype), "Temporal.ZonedDateTime.prototype");
diff --git a/test/built-ins/Temporal/ZonedDateTime/prototype/era/branding.js b/test/built-ins/Temporal/ZonedDateTime/prototype/era/branding.js
new file mode 100644
index 0000000000..9e66ba1223
--- /dev/null
+++ b/test/built-ins/Temporal/ZonedDateTime/prototype/era/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.zoneddatetime.prototype.era
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const era = Object.getOwnPropertyDescriptor(Temporal.ZonedDateTime.prototype, "era").get;
+
+assert.sameValue(typeof era, "function");
+
+assert.throws(TypeError, () => era.call(undefined), "undefined");
+assert.throws(TypeError, () => era.call(null), "null");
+assert.throws(TypeError, () => era.call(true), "true");
+assert.throws(TypeError, () => era.call(""), "empty string");
+assert.throws(TypeError, () => era.call(Symbol()), "symbol");
+assert.throws(TypeError, () => era.call(1), "1");
+assert.throws(TypeError, () => era.call({}), "plain object");
+assert.throws(TypeError, () => era.call(Temporal.ZonedDateTime), "Temporal.ZonedDateTime");
+assert.throws(TypeError, () => era.call(Temporal.ZonedDateTime.prototype), "Temporal.ZonedDateTime.prototype");
diff --git a/test/built-ins/Temporal/ZonedDateTime/prototype/eraYear/branding.js b/test/built-ins/Temporal/ZonedDateTime/prototype/eraYear/branding.js
new file mode 100644
index 0000000000..f3a0d105c0
--- /dev/null
+++ b/test/built-ins/Temporal/ZonedDateTime/prototype/eraYear/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.zoneddatetime.prototype.erayear
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const eraYear = Object.getOwnPropertyDescriptor(Temporal.ZonedDateTime.prototype, "eraYear").get;
+
+assert.sameValue(typeof eraYear, "function");
+
+assert.throws(TypeError, () => eraYear.call(undefined), "undefined");
+assert.throws(TypeError, () => eraYear.call(null), "null");
+assert.throws(TypeError, () => eraYear.call(true), "true");
+assert.throws(TypeError, () => eraYear.call(""), "empty string");
+assert.throws(TypeError, () => eraYear.call(Symbol()), "symbol");
+assert.throws(TypeError, () => eraYear.call(1), "1");
+assert.throws(TypeError, () => eraYear.call({}), "plain object");
+assert.throws(TypeError, () => eraYear.call(Temporal.ZonedDateTime), "Temporal.ZonedDateTime");
+assert.throws(TypeError, () => eraYear.call(Temporal.ZonedDateTime.prototype), "Temporal.ZonedDateTime.prototype");
diff --git a/test/built-ins/Temporal/ZonedDateTime/prototype/getISOFields/branding.js b/test/built-ins/Temporal/ZonedDateTime/prototype/getISOFields/branding.js
new file mode 100644
index 0000000000..9524ed7e60
--- /dev/null
+++ b/test/built-ins/Temporal/ZonedDateTime/prototype/getISOFields/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.zoneddatetime.prototype.getisofields
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const getISOFields = Temporal.ZonedDateTime.prototype.getISOFields;
+
+assert.sameValue(typeof getISOFields, "function");
+
+assert.throws(TypeError, () => getISOFields.call(undefined), "undefined");
+assert.throws(TypeError, () => getISOFields.call(null), "null");
+assert.throws(TypeError, () => getISOFields.call(true), "true");
+assert.throws(TypeError, () => getISOFields.call(""), "empty string");
+assert.throws(TypeError, () => getISOFields.call(Symbol()), "symbol");
+assert.throws(TypeError, () => getISOFields.call(1), "1");
+assert.throws(TypeError, () => getISOFields.call({}), "plain object");
+assert.throws(TypeError, () => getISOFields.call(Temporal.ZonedDateTime), "Temporal.ZonedDateTime");
+assert.throws(TypeError, () => getISOFields.call(Temporal.ZonedDateTime.prototype), "Temporal.ZonedDateTime.prototype");
diff --git a/test/built-ins/Temporal/ZonedDateTime/prototype/hour/branding.js b/test/built-ins/Temporal/ZonedDateTime/prototype/hour/branding.js
new file mode 100644
index 0000000000..d080fcecbf
--- /dev/null
+++ b/test/built-ins/Temporal/ZonedDateTime/prototype/hour/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.zoneddatetime.prototype.hour
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const hour = Object.getOwnPropertyDescriptor(Temporal.ZonedDateTime.prototype, "hour").get;
+
+assert.sameValue(typeof hour, "function");
+
+assert.throws(TypeError, () => hour.call(undefined), "undefined");
+assert.throws(TypeError, () => hour.call(null), "null");
+assert.throws(TypeError, () => hour.call(true), "true");
+assert.throws(TypeError, () => hour.call(""), "empty string");
+assert.throws(TypeError, () => hour.call(Symbol()), "symbol");
+assert.throws(TypeError, () => hour.call(1), "1");
+assert.throws(TypeError, () => hour.call({}), "plain object");
+assert.throws(TypeError, () => hour.call(Temporal.ZonedDateTime), "Temporal.ZonedDateTime");
+assert.throws(TypeError, () => hour.call(Temporal.ZonedDateTime.prototype), "Temporal.ZonedDateTime.prototype");
diff --git a/test/built-ins/Temporal/ZonedDateTime/prototype/hoursInDay/branding.js b/test/built-ins/Temporal/ZonedDateTime/prototype/hoursInDay/branding.js
new file mode 100644
index 0000000000..65dd234131
--- /dev/null
+++ b/test/built-ins/Temporal/ZonedDateTime/prototype/hoursInDay/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.zoneddatetime.prototype.hoursinday
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const hoursInDay = Object.getOwnPropertyDescriptor(Temporal.ZonedDateTime.prototype, "hoursInDay").get;
+
+assert.sameValue(typeof hoursInDay, "function");
+
+assert.throws(TypeError, () => hoursInDay.call(undefined), "undefined");
+assert.throws(TypeError, () => hoursInDay.call(null), "null");
+assert.throws(TypeError, () => hoursInDay.call(true), "true");
+assert.throws(TypeError, () => hoursInDay.call(""), "empty string");
+assert.throws(TypeError, () => hoursInDay.call(Symbol()), "symbol");
+assert.throws(TypeError, () => hoursInDay.call(1), "1");
+assert.throws(TypeError, () => hoursInDay.call({}), "plain object");
+assert.throws(TypeError, () => hoursInDay.call(Temporal.ZonedDateTime), "Temporal.ZonedDateTime");
+assert.throws(TypeError, () => hoursInDay.call(Temporal.ZonedDateTime.prototype), "Temporal.ZonedDateTime.prototype");
diff --git a/test/built-ins/Temporal/ZonedDateTime/prototype/inLeapYear/branding.js b/test/built-ins/Temporal/ZonedDateTime/prototype/inLeapYear/branding.js
new file mode 100644
index 0000000000..edf5df8cf8
--- /dev/null
+++ b/test/built-ins/Temporal/ZonedDateTime/prototype/inLeapYear/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.zoneddatetime.prototype.inleapyear
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const inLeapYear = Object.getOwnPropertyDescriptor(Temporal.ZonedDateTime.prototype, "inLeapYear").get;
+
+assert.sameValue(typeof inLeapYear, "function");
+
+assert.throws(TypeError, () => inLeapYear.call(undefined), "undefined");
+assert.throws(TypeError, () => inLeapYear.call(null), "null");
+assert.throws(TypeError, () => inLeapYear.call(true), "true");
+assert.throws(TypeError, () => inLeapYear.call(""), "empty string");
+assert.throws(TypeError, () => inLeapYear.call(Symbol()), "symbol");
+assert.throws(TypeError, () => inLeapYear.call(1), "1");
+assert.throws(TypeError, () => inLeapYear.call({}), "plain object");
+assert.throws(TypeError, () => inLeapYear.call(Temporal.ZonedDateTime), "Temporal.ZonedDateTime");
+assert.throws(TypeError, () => inLeapYear.call(Temporal.ZonedDateTime.prototype), "Temporal.ZonedDateTime.prototype");
diff --git a/test/built-ins/Temporal/ZonedDateTime/prototype/microsecond/branding.js b/test/built-ins/Temporal/ZonedDateTime/prototype/microsecond/branding.js
new file mode 100644
index 0000000000..28861479f9
--- /dev/null
+++ b/test/built-ins/Temporal/ZonedDateTime/prototype/microsecond/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.zoneddatetime.prototype.microsecond
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const microsecond = Object.getOwnPropertyDescriptor(Temporal.ZonedDateTime.prototype, "microsecond").get;
+
+assert.sameValue(typeof microsecond, "function");
+
+assert.throws(TypeError, () => microsecond.call(undefined), "undefined");
+assert.throws(TypeError, () => microsecond.call(null), "null");
+assert.throws(TypeError, () => microsecond.call(true), "true");
+assert.throws(TypeError, () => microsecond.call(""), "empty string");
+assert.throws(TypeError, () => microsecond.call(Symbol()), "symbol");
+assert.throws(TypeError, () => microsecond.call(1), "1");
+assert.throws(TypeError, () => microsecond.call({}), "plain object");
+assert.throws(TypeError, () => microsecond.call(Temporal.ZonedDateTime), "Temporal.ZonedDateTime");
+assert.throws(TypeError, () => microsecond.call(Temporal.ZonedDateTime.prototype), "Temporal.ZonedDateTime.prototype");
diff --git a/test/built-ins/Temporal/ZonedDateTime/prototype/millisecond/branding.js b/test/built-ins/Temporal/ZonedDateTime/prototype/millisecond/branding.js
new file mode 100644
index 0000000000..2a243a975a
--- /dev/null
+++ b/test/built-ins/Temporal/ZonedDateTime/prototype/millisecond/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.zoneddatetime.prototype.millisecond
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const millisecond = Object.getOwnPropertyDescriptor(Temporal.ZonedDateTime.prototype, "millisecond").get;
+
+assert.sameValue(typeof millisecond, "function");
+
+assert.throws(TypeError, () => millisecond.call(undefined), "undefined");
+assert.throws(TypeError, () => millisecond.call(null), "null");
+assert.throws(TypeError, () => millisecond.call(true), "true");
+assert.throws(TypeError, () => millisecond.call(""), "empty string");
+assert.throws(TypeError, () => millisecond.call(Symbol()), "symbol");
+assert.throws(TypeError, () => millisecond.call(1), "1");
+assert.throws(TypeError, () => millisecond.call({}), "plain object");
+assert.throws(TypeError, () => millisecond.call(Temporal.ZonedDateTime), "Temporal.ZonedDateTime");
+assert.throws(TypeError, () => millisecond.call(Temporal.ZonedDateTime.prototype), "Temporal.ZonedDateTime.prototype");
diff --git a/test/built-ins/Temporal/ZonedDateTime/prototype/minute/branding.js b/test/built-ins/Temporal/ZonedDateTime/prototype/minute/branding.js
new file mode 100644
index 0000000000..0d354cf111
--- /dev/null
+++ b/test/built-ins/Temporal/ZonedDateTime/prototype/minute/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.zoneddatetime.prototype.minute
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const minute = Object.getOwnPropertyDescriptor(Temporal.ZonedDateTime.prototype, "minute").get;
+
+assert.sameValue(typeof minute, "function");
+
+assert.throws(TypeError, () => minute.call(undefined), "undefined");
+assert.throws(TypeError, () => minute.call(null), "null");
+assert.throws(TypeError, () => minute.call(true), "true");
+assert.throws(TypeError, () => minute.call(""), "empty string");
+assert.throws(TypeError, () => minute.call(Symbol()), "symbol");
+assert.throws(TypeError, () => minute.call(1), "1");
+assert.throws(TypeError, () => minute.call({}), "plain object");
+assert.throws(TypeError, () => minute.call(Temporal.ZonedDateTime), "Temporal.ZonedDateTime");
+assert.throws(TypeError, () => minute.call(Temporal.ZonedDateTime.prototype), "Temporal.ZonedDateTime.prototype");
diff --git a/test/built-ins/Temporal/ZonedDateTime/prototype/month/branding.js b/test/built-ins/Temporal/ZonedDateTime/prototype/month/branding.js
new file mode 100644
index 0000000000..763f424375
--- /dev/null
+++ b/test/built-ins/Temporal/ZonedDateTime/prototype/month/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.zoneddatetime.prototype.month
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const month = Object.getOwnPropertyDescriptor(Temporal.ZonedDateTime.prototype, "month").get;
+
+assert.sameValue(typeof month, "function");
+
+assert.throws(TypeError, () => month.call(undefined), "undefined");
+assert.throws(TypeError, () => month.call(null), "null");
+assert.throws(TypeError, () => month.call(true), "true");
+assert.throws(TypeError, () => month.call(""), "empty string");
+assert.throws(TypeError, () => month.call(Symbol()), "symbol");
+assert.throws(TypeError, () => month.call(1), "1");
+assert.throws(TypeError, () => month.call({}), "plain object");
+assert.throws(TypeError, () => month.call(Temporal.ZonedDateTime), "Temporal.ZonedDateTime");
+assert.throws(TypeError, () => month.call(Temporal.ZonedDateTime.prototype), "Temporal.ZonedDateTime.prototype");
diff --git a/test/built-ins/Temporal/ZonedDateTime/prototype/monthCode/branding.js b/test/built-ins/Temporal/ZonedDateTime/prototype/monthCode/branding.js
new file mode 100644
index 0000000000..c6bbd04373
--- /dev/null
+++ b/test/built-ins/Temporal/ZonedDateTime/prototype/monthCode/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.zoneddatetime.prototype.monthcode
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const monthCode = Object.getOwnPropertyDescriptor(Temporal.ZonedDateTime.prototype, "monthCode").get;
+
+assert.sameValue(typeof monthCode, "function");
+
+assert.throws(TypeError, () => monthCode.call(undefined), "undefined");
+assert.throws(TypeError, () => monthCode.call(null), "null");
+assert.throws(TypeError, () => monthCode.call(true), "true");
+assert.throws(TypeError, () => monthCode.call(""), "empty string");
+assert.throws(TypeError, () => monthCode.call(Symbol()), "symbol");
+assert.throws(TypeError, () => monthCode.call(1), "1");
+assert.throws(TypeError, () => monthCode.call({}), "plain object");
+assert.throws(TypeError, () => monthCode.call(Temporal.ZonedDateTime), "Temporal.ZonedDateTime");
+assert.throws(TypeError, () => monthCode.call(Temporal.ZonedDateTime.prototype), "Temporal.ZonedDateTime.prototype");
diff --git a/test/built-ins/Temporal/ZonedDateTime/prototype/monthsInYear/branding.js b/test/built-ins/Temporal/ZonedDateTime/prototype/monthsInYear/branding.js
new file mode 100644
index 0000000000..c6df1292d2
--- /dev/null
+++ b/test/built-ins/Temporal/ZonedDateTime/prototype/monthsInYear/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.zoneddatetime.prototype.monthsinyear
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const monthsInYear = Object.getOwnPropertyDescriptor(Temporal.ZonedDateTime.prototype, "monthsInYear").get;
+
+assert.sameValue(typeof monthsInYear, "function");
+
+assert.throws(TypeError, () => monthsInYear.call(undefined), "undefined");
+assert.throws(TypeError, () => monthsInYear.call(null), "null");
+assert.throws(TypeError, () => monthsInYear.call(true), "true");
+assert.throws(TypeError, () => monthsInYear.call(""), "empty string");
+assert.throws(TypeError, () => monthsInYear.call(Symbol()), "symbol");
+assert.throws(TypeError, () => monthsInYear.call(1), "1");
+assert.throws(TypeError, () => monthsInYear.call({}), "plain object");
+assert.throws(TypeError, () => monthsInYear.call(Temporal.ZonedDateTime), "Temporal.ZonedDateTime");
+assert.throws(TypeError, () => monthsInYear.call(Temporal.ZonedDateTime.prototype), "Temporal.ZonedDateTime.prototype");
diff --git a/test/built-ins/Temporal/ZonedDateTime/prototype/nanosecond/branding.js b/test/built-ins/Temporal/ZonedDateTime/prototype/nanosecond/branding.js
new file mode 100644
index 0000000000..a0f6e8fe29
--- /dev/null
+++ b/test/built-ins/Temporal/ZonedDateTime/prototype/nanosecond/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.zoneddatetime.prototype.nanosecond
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const nanosecond = Object.getOwnPropertyDescriptor(Temporal.ZonedDateTime.prototype, "nanosecond").get;
+
+assert.sameValue(typeof nanosecond, "function");
+
+assert.throws(TypeError, () => nanosecond.call(undefined), "undefined");
+assert.throws(TypeError, () => nanosecond.call(null), "null");
+assert.throws(TypeError, () => nanosecond.call(true), "true");
+assert.throws(TypeError, () => nanosecond.call(""), "empty string");
+assert.throws(TypeError, () => nanosecond.call(Symbol()), "symbol");
+assert.throws(TypeError, () => nanosecond.call(1), "1");
+assert.throws(TypeError, () => nanosecond.call({}), "plain object");
+assert.throws(TypeError, () => nanosecond.call(Temporal.ZonedDateTime), "Temporal.ZonedDateTime");
+assert.throws(TypeError, () => nanosecond.call(Temporal.ZonedDateTime.prototype), "Temporal.ZonedDateTime.prototype");
diff --git a/test/built-ins/Temporal/ZonedDateTime/prototype/offset/branding.js b/test/built-ins/Temporal/ZonedDateTime/prototype/offset/branding.js
new file mode 100644
index 0000000000..4a4262d43b
--- /dev/null
+++ b/test/built-ins/Temporal/ZonedDateTime/prototype/offset/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.zoneddatetime.prototype.offset
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const offset = Object.getOwnPropertyDescriptor(Temporal.ZonedDateTime.prototype, "offset").get;
+
+assert.sameValue(typeof offset, "function");
+
+assert.throws(TypeError, () => offset.call(undefined), "undefined");
+assert.throws(TypeError, () => offset.call(null), "null");
+assert.throws(TypeError, () => offset.call(true), "true");
+assert.throws(TypeError, () => offset.call(""), "empty string");
+assert.throws(TypeError, () => offset.call(Symbol()), "symbol");
+assert.throws(TypeError, () => offset.call(1), "1");
+assert.throws(TypeError, () => offset.call({}), "plain object");
+assert.throws(TypeError, () => offset.call(Temporal.ZonedDateTime), "Temporal.ZonedDateTime");
+assert.throws(TypeError, () => offset.call(Temporal.ZonedDateTime.prototype), "Temporal.ZonedDateTime.prototype");
diff --git a/test/built-ins/Temporal/ZonedDateTime/prototype/offsetNanoseconds/branding.js b/test/built-ins/Temporal/ZonedDateTime/prototype/offsetNanoseconds/branding.js
new file mode 100644
index 0000000000..26d46fe656
--- /dev/null
+++ b/test/built-ins/Temporal/ZonedDateTime/prototype/offsetNanoseconds/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.zoneddatetime.prototype.offsetnanoseconds
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const offsetNanoseconds = Object.getOwnPropertyDescriptor(Temporal.ZonedDateTime.prototype, "offsetNanoseconds").get;
+
+assert.sameValue(typeof offsetNanoseconds, "function");
+
+assert.throws(TypeError, () => offsetNanoseconds.call(undefined), "undefined");
+assert.throws(TypeError, () => offsetNanoseconds.call(null), "null");
+assert.throws(TypeError, () => offsetNanoseconds.call(true), "true");
+assert.throws(TypeError, () => offsetNanoseconds.call(""), "empty string");
+assert.throws(TypeError, () => offsetNanoseconds.call(Symbol()), "symbol");
+assert.throws(TypeError, () => offsetNanoseconds.call(1), "1");
+assert.throws(TypeError, () => offsetNanoseconds.call({}), "plain object");
+assert.throws(TypeError, () => offsetNanoseconds.call(Temporal.ZonedDateTime), "Temporal.ZonedDateTime");
+assert.throws(TypeError, () => offsetNanoseconds.call(Temporal.ZonedDateTime.prototype), "Temporal.ZonedDateTime.prototype");
diff --git a/test/built-ins/Temporal/ZonedDateTime/prototype/round/branding.js b/test/built-ins/Temporal/ZonedDateTime/prototype/round/branding.js
new file mode 100644
index 0000000000..f0b708e841
--- /dev/null
+++ b/test/built-ins/Temporal/ZonedDateTime/prototype/round/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.zoneddatetime.prototype.round
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const round = Temporal.ZonedDateTime.prototype.round;
+
+assert.sameValue(typeof round, "function");
+
+assert.throws(TypeError, () => round.call(undefined), "undefined");
+assert.throws(TypeError, () => round.call(null), "null");
+assert.throws(TypeError, () => round.call(true), "true");
+assert.throws(TypeError, () => round.call(""), "empty string");
+assert.throws(TypeError, () => round.call(Symbol()), "symbol");
+assert.throws(TypeError, () => round.call(1), "1");
+assert.throws(TypeError, () => round.call({}), "plain object");
+assert.throws(TypeError, () => round.call(Temporal.ZonedDateTime), "Temporal.ZonedDateTime");
+assert.throws(TypeError, () => round.call(Temporal.ZonedDateTime.prototype), "Temporal.ZonedDateTime.prototype");
diff --git a/test/built-ins/Temporal/ZonedDateTime/prototype/second/branding.js b/test/built-ins/Temporal/ZonedDateTime/prototype/second/branding.js
new file mode 100644
index 0000000000..0ff1691779
--- /dev/null
+++ b/test/built-ins/Temporal/ZonedDateTime/prototype/second/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.zoneddatetime.prototype.second
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const second = Object.getOwnPropertyDescriptor(Temporal.ZonedDateTime.prototype, "second").get;
+
+assert.sameValue(typeof second, "function");
+
+assert.throws(TypeError, () => second.call(undefined), "undefined");
+assert.throws(TypeError, () => second.call(null), "null");
+assert.throws(TypeError, () => second.call(true), "true");
+assert.throws(TypeError, () => second.call(""), "empty string");
+assert.throws(TypeError, () => second.call(Symbol()), "symbol");
+assert.throws(TypeError, () => second.call(1), "1");
+assert.throws(TypeError, () => second.call({}), "plain object");
+assert.throws(TypeError, () => second.call(Temporal.ZonedDateTime), "Temporal.ZonedDateTime");
+assert.throws(TypeError, () => second.call(Temporal.ZonedDateTime.prototype), "Temporal.ZonedDateTime.prototype");
diff --git a/test/built-ins/Temporal/ZonedDateTime/prototype/since/branding.js b/test/built-ins/Temporal/ZonedDateTime/prototype/since/branding.js
new file mode 100644
index 0000000000..2676e647af
--- /dev/null
+++ b/test/built-ins/Temporal/ZonedDateTime/prototype/since/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.zoneddatetime.prototype.since
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const since = Temporal.ZonedDateTime.prototype.since;
+
+assert.sameValue(typeof since, "function");
+
+assert.throws(TypeError, () => since.call(undefined), "undefined");
+assert.throws(TypeError, () => since.call(null), "null");
+assert.throws(TypeError, () => since.call(true), "true");
+assert.throws(TypeError, () => since.call(""), "empty string");
+assert.throws(TypeError, () => since.call(Symbol()), "symbol");
+assert.throws(TypeError, () => since.call(1), "1");
+assert.throws(TypeError, () => since.call({}), "plain object");
+assert.throws(TypeError, () => since.call(Temporal.ZonedDateTime), "Temporal.ZonedDateTime");
+assert.throws(TypeError, () => since.call(Temporal.ZonedDateTime.prototype), "Temporal.ZonedDateTime.prototype");
diff --git a/test/built-ins/Temporal/ZonedDateTime/prototype/startOfDay/branding.js b/test/built-ins/Temporal/ZonedDateTime/prototype/startOfDay/branding.js
new file mode 100644
index 0000000000..9877e2aa59
--- /dev/null
+++ b/test/built-ins/Temporal/ZonedDateTime/prototype/startOfDay/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.zoneddatetime.prototype.startofday
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const startOfDay = Temporal.ZonedDateTime.prototype.startOfDay;
+
+assert.sameValue(typeof startOfDay, "function");
+
+assert.throws(TypeError, () => startOfDay.call(undefined), "undefined");
+assert.throws(TypeError, () => startOfDay.call(null), "null");
+assert.throws(TypeError, () => startOfDay.call(true), "true");
+assert.throws(TypeError, () => startOfDay.call(""), "empty string");
+assert.throws(TypeError, () => startOfDay.call(Symbol()), "symbol");
+assert.throws(TypeError, () => startOfDay.call(1), "1");
+assert.throws(TypeError, () => startOfDay.call({}), "plain object");
+assert.throws(TypeError, () => startOfDay.call(Temporal.ZonedDateTime), "Temporal.ZonedDateTime");
+assert.throws(TypeError, () => startOfDay.call(Temporal.ZonedDateTime.prototype), "Temporal.ZonedDateTime.prototype");
diff --git a/test/built-ins/Temporal/ZonedDateTime/prototype/subtract/branding.js b/test/built-ins/Temporal/ZonedDateTime/prototype/subtract/branding.js
new file mode 100644
index 0000000000..0dcb416836
--- /dev/null
+++ b/test/built-ins/Temporal/ZonedDateTime/prototype/subtract/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.zoneddatetime.prototype.subtract
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const subtract = Temporal.ZonedDateTime.prototype.subtract;
+
+assert.sameValue(typeof subtract, "function");
+
+assert.throws(TypeError, () => subtract.call(undefined), "undefined");
+assert.throws(TypeError, () => subtract.call(null), "null");
+assert.throws(TypeError, () => subtract.call(true), "true");
+assert.throws(TypeError, () => subtract.call(""), "empty string");
+assert.throws(TypeError, () => subtract.call(Symbol()), "symbol");
+assert.throws(TypeError, () => subtract.call(1), "1");
+assert.throws(TypeError, () => subtract.call({}), "plain object");
+assert.throws(TypeError, () => subtract.call(Temporal.ZonedDateTime), "Temporal.ZonedDateTime");
+assert.throws(TypeError, () => subtract.call(Temporal.ZonedDateTime.prototype), "Temporal.ZonedDateTime.prototype");
diff --git a/test/built-ins/Temporal/ZonedDateTime/prototype/timeZone/branding.js b/test/built-ins/Temporal/ZonedDateTime/prototype/timeZone/branding.js
new file mode 100644
index 0000000000..15ac6fc049
--- /dev/null
+++ b/test/built-ins/Temporal/ZonedDateTime/prototype/timeZone/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.zoneddatetime.prototype.timezone
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const timeZone = Object.getOwnPropertyDescriptor(Temporal.ZonedDateTime.prototype, "timeZone").get;
+
+assert.sameValue(typeof timeZone, "function");
+
+assert.throws(TypeError, () => timeZone.call(undefined), "undefined");
+assert.throws(TypeError, () => timeZone.call(null), "null");
+assert.throws(TypeError, () => timeZone.call(true), "true");
+assert.throws(TypeError, () => timeZone.call(""), "empty string");
+assert.throws(TypeError, () => timeZone.call(Symbol()), "symbol");
+assert.throws(TypeError, () => timeZone.call(1), "1");
+assert.throws(TypeError, () => timeZone.call({}), "plain object");
+assert.throws(TypeError, () => timeZone.call(Temporal.ZonedDateTime), "Temporal.ZonedDateTime");
+assert.throws(TypeError, () => timeZone.call(Temporal.ZonedDateTime.prototype), "Temporal.ZonedDateTime.prototype");
diff --git a/test/built-ins/Temporal/ZonedDateTime/prototype/toInstant/branding.js b/test/built-ins/Temporal/ZonedDateTime/prototype/toInstant/branding.js
new file mode 100644
index 0000000000..f3285c1d55
--- /dev/null
+++ b/test/built-ins/Temporal/ZonedDateTime/prototype/toInstant/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.zoneddatetime.prototype.toinstant
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const toInstant = Temporal.ZonedDateTime.prototype.toInstant;
+
+assert.sameValue(typeof toInstant, "function");
+
+assert.throws(TypeError, () => toInstant.call(undefined), "undefined");
+assert.throws(TypeError, () => toInstant.call(null), "null");
+assert.throws(TypeError, () => toInstant.call(true), "true");
+assert.throws(TypeError, () => toInstant.call(""), "empty string");
+assert.throws(TypeError, () => toInstant.call(Symbol()), "symbol");
+assert.throws(TypeError, () => toInstant.call(1), "1");
+assert.throws(TypeError, () => toInstant.call({}), "plain object");
+assert.throws(TypeError, () => toInstant.call(Temporal.ZonedDateTime), "Temporal.ZonedDateTime");
+assert.throws(TypeError, () => toInstant.call(Temporal.ZonedDateTime.prototype), "Temporal.ZonedDateTime.prototype");
diff --git a/test/built-ins/Temporal/ZonedDateTime/prototype/toJSON/branding.js b/test/built-ins/Temporal/ZonedDateTime/prototype/toJSON/branding.js
new file mode 100644
index 0000000000..ac81e4c9f9
--- /dev/null
+++ b/test/built-ins/Temporal/ZonedDateTime/prototype/toJSON/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.zoneddatetime.prototype.tojson
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const toJSON = Temporal.ZonedDateTime.prototype.toJSON;
+
+assert.sameValue(typeof toJSON, "function");
+
+assert.throws(TypeError, () => toJSON.call(undefined), "undefined");
+assert.throws(TypeError, () => toJSON.call(null), "null");
+assert.throws(TypeError, () => toJSON.call(true), "true");
+assert.throws(TypeError, () => toJSON.call(""), "empty string");
+assert.throws(TypeError, () => toJSON.call(Symbol()), "symbol");
+assert.throws(TypeError, () => toJSON.call(1), "1");
+assert.throws(TypeError, () => toJSON.call({}), "plain object");
+assert.throws(TypeError, () => toJSON.call(Temporal.ZonedDateTime), "Temporal.ZonedDateTime");
+assert.throws(TypeError, () => toJSON.call(Temporal.ZonedDateTime.prototype), "Temporal.ZonedDateTime.prototype");
diff --git a/test/built-ins/Temporal/ZonedDateTime/prototype/toLocaleString/branding.js b/test/built-ins/Temporal/ZonedDateTime/prototype/toLocaleString/branding.js
new file mode 100644
index 0000000000..1a6f091be1
--- /dev/null
+++ b/test/built-ins/Temporal/ZonedDateTime/prototype/toLocaleString/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.zoneddatetime.prototype.tolocalestring
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const toLocaleString = Temporal.ZonedDateTime.prototype.toLocaleString;
+
+assert.sameValue(typeof toLocaleString, "function");
+
+assert.throws(TypeError, () => toLocaleString.call(undefined), "undefined");
+assert.throws(TypeError, () => toLocaleString.call(null), "null");
+assert.throws(TypeError, () => toLocaleString.call(true), "true");
+assert.throws(TypeError, () => toLocaleString.call(""), "empty string");
+assert.throws(TypeError, () => toLocaleString.call(Symbol()), "symbol");
+assert.throws(TypeError, () => toLocaleString.call(1), "1");
+assert.throws(TypeError, () => toLocaleString.call({}), "plain object");
+assert.throws(TypeError, () => toLocaleString.call(Temporal.ZonedDateTime), "Temporal.ZonedDateTime");
+assert.throws(TypeError, () => toLocaleString.call(Temporal.ZonedDateTime.prototype), "Temporal.ZonedDateTime.prototype");
diff --git a/test/built-ins/Temporal/ZonedDateTime/prototype/toPlainDate/branding.js b/test/built-ins/Temporal/ZonedDateTime/prototype/toPlainDate/branding.js
new file mode 100644
index 0000000000..d5e774a56a
--- /dev/null
+++ b/test/built-ins/Temporal/ZonedDateTime/prototype/toPlainDate/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.zoneddatetime.prototype.toplaindate
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const toPlainDate = Temporal.ZonedDateTime.prototype.toPlainDate;
+
+assert.sameValue(typeof toPlainDate, "function");
+
+assert.throws(TypeError, () => toPlainDate.call(undefined), "undefined");
+assert.throws(TypeError, () => toPlainDate.call(null), "null");
+assert.throws(TypeError, () => toPlainDate.call(true), "true");
+assert.throws(TypeError, () => toPlainDate.call(""), "empty string");
+assert.throws(TypeError, () => toPlainDate.call(Symbol()), "symbol");
+assert.throws(TypeError, () => toPlainDate.call(1), "1");
+assert.throws(TypeError, () => toPlainDate.call({}), "plain object");
+assert.throws(TypeError, () => toPlainDate.call(Temporal.ZonedDateTime), "Temporal.ZonedDateTime");
+assert.throws(TypeError, () => toPlainDate.call(Temporal.ZonedDateTime.prototype), "Temporal.ZonedDateTime.prototype");
diff --git a/test/built-ins/Temporal/ZonedDateTime/prototype/toPlainDateTime/branding.js b/test/built-ins/Temporal/ZonedDateTime/prototype/toPlainDateTime/branding.js
new file mode 100644
index 0000000000..8cd4ee4943
--- /dev/null
+++ b/test/built-ins/Temporal/ZonedDateTime/prototype/toPlainDateTime/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2020 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.zoneddatetime.prototype.toplaindatetime
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const toPlainDateTime = Temporal.ZonedDateTime.prototype.toPlainDateTime;
+
+assert.sameValue(typeof toPlainDateTime, "function");
+
+assert.throws(TypeError, () => toPlainDateTime.call(undefined), "undefined");
+assert.throws(TypeError, () => toPlainDateTime.call(null), "null");
+assert.throws(TypeError, () => toPlainDateTime.call(true), "true");
+assert.throws(TypeError, () => toPlainDateTime.call(""), "empty string");
+assert.throws(TypeError, () => toPlainDateTime.call(Symbol()), "symbol");
+assert.throws(TypeError, () => toPlainDateTime.call(1), "1");
+assert.throws(TypeError, () => toPlainDateTime.call({}), "plain object");
+assert.throws(TypeError, () => toPlainDateTime.call(Temporal.ZonedDateTime), "Temporal.ZonedDateTime");
+assert.throws(TypeError, () => toPlainDateTime.call(Temporal.ZonedDateTime.prototype), "Temporal.ZonedDateTime.prototype");
diff --git a/test/built-ins/Temporal/ZonedDateTime/prototype/toPlainMonthDay/branding.js b/test/built-ins/Temporal/ZonedDateTime/prototype/toPlainMonthDay/branding.js
new file mode 100644
index 0000000000..d758ea470e
--- /dev/null
+++ b/test/built-ins/Temporal/ZonedDateTime/prototype/toPlainMonthDay/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.zoneddatetime.prototype.toplainmonthday
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const toPlainMonthDay = Temporal.ZonedDateTime.prototype.toPlainMonthDay;
+
+assert.sameValue(typeof toPlainMonthDay, "function");
+
+assert.throws(TypeError, () => toPlainMonthDay.call(undefined), "undefined");
+assert.throws(TypeError, () => toPlainMonthDay.call(null), "null");
+assert.throws(TypeError, () => toPlainMonthDay.call(true), "true");
+assert.throws(TypeError, () => toPlainMonthDay.call(""), "empty string");
+assert.throws(TypeError, () => toPlainMonthDay.call(Symbol()), "symbol");
+assert.throws(TypeError, () => toPlainMonthDay.call(1), "1");
+assert.throws(TypeError, () => toPlainMonthDay.call({}), "plain object");
+assert.throws(TypeError, () => toPlainMonthDay.call(Temporal.ZonedDateTime), "Temporal.ZonedDateTime");
+assert.throws(TypeError, () => toPlainMonthDay.call(Temporal.ZonedDateTime.prototype), "Temporal.ZonedDateTime.prototype");
diff --git a/test/built-ins/Temporal/ZonedDateTime/prototype/toPlainTime/branding.js b/test/built-ins/Temporal/ZonedDateTime/prototype/toPlainTime/branding.js
new file mode 100644
index 0000000000..2cc9ab9de8
--- /dev/null
+++ b/test/built-ins/Temporal/ZonedDateTime/prototype/toPlainTime/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.zoneddatetime.prototype.toplaintime
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const toPlainTime = Temporal.ZonedDateTime.prototype.toPlainTime;
+
+assert.sameValue(typeof toPlainTime, "function");
+
+assert.throws(TypeError, () => toPlainTime.call(undefined), "undefined");
+assert.throws(TypeError, () => toPlainTime.call(null), "null");
+assert.throws(TypeError, () => toPlainTime.call(true), "true");
+assert.throws(TypeError, () => toPlainTime.call(""), "empty string");
+assert.throws(TypeError, () => toPlainTime.call(Symbol()), "symbol");
+assert.throws(TypeError, () => toPlainTime.call(1), "1");
+assert.throws(TypeError, () => toPlainTime.call({}), "plain object");
+assert.throws(TypeError, () => toPlainTime.call(Temporal.ZonedDateTime), "Temporal.ZonedDateTime");
+assert.throws(TypeError, () => toPlainTime.call(Temporal.ZonedDateTime.prototype), "Temporal.ZonedDateTime.prototype");
diff --git a/test/built-ins/Temporal/ZonedDateTime/prototype/toPlainYearMonth/branding.js b/test/built-ins/Temporal/ZonedDateTime/prototype/toPlainYearMonth/branding.js
new file mode 100644
index 0000000000..772c7f4320
--- /dev/null
+++ b/test/built-ins/Temporal/ZonedDateTime/prototype/toPlainYearMonth/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.zoneddatetime.prototype.toplainyearmonth
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const toPlainYearMonth = Temporal.ZonedDateTime.prototype.toPlainYearMonth;
+
+assert.sameValue(typeof toPlainYearMonth, "function");
+
+assert.throws(TypeError, () => toPlainYearMonth.call(undefined), "undefined");
+assert.throws(TypeError, () => toPlainYearMonth.call(null), "null");
+assert.throws(TypeError, () => toPlainYearMonth.call(true), "true");
+assert.throws(TypeError, () => toPlainYearMonth.call(""), "empty string");
+assert.throws(TypeError, () => toPlainYearMonth.call(Symbol()), "symbol");
+assert.throws(TypeError, () => toPlainYearMonth.call(1), "1");
+assert.throws(TypeError, () => toPlainYearMonth.call({}), "plain object");
+assert.throws(TypeError, () => toPlainYearMonth.call(Temporal.ZonedDateTime), "Temporal.ZonedDateTime");
+assert.throws(TypeError, () => toPlainYearMonth.call(Temporal.ZonedDateTime.prototype), "Temporal.ZonedDateTime.prototype");
diff --git a/test/built-ins/Temporal/ZonedDateTime/prototype/toString/branding.js b/test/built-ins/Temporal/ZonedDateTime/prototype/toString/branding.js
new file mode 100644
index 0000000000..b07f47f7f1
--- /dev/null
+++ b/test/built-ins/Temporal/ZonedDateTime/prototype/toString/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.zoneddatetime.prototype.tostring
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const toString = Temporal.ZonedDateTime.prototype.toString;
+
+assert.sameValue(typeof toString, "function");
+
+assert.throws(TypeError, () => toString.call(undefined), "undefined");
+assert.throws(TypeError, () => toString.call(null), "null");
+assert.throws(TypeError, () => toString.call(true), "true");
+assert.throws(TypeError, () => toString.call(""), "empty string");
+assert.throws(TypeError, () => toString.call(Symbol()), "symbol");
+assert.throws(TypeError, () => toString.call(1), "1");
+assert.throws(TypeError, () => toString.call({}), "plain object");
+assert.throws(TypeError, () => toString.call(Temporal.ZonedDateTime), "Temporal.ZonedDateTime");
+assert.throws(TypeError, () => toString.call(Temporal.ZonedDateTime.prototype), "Temporal.ZonedDateTime.prototype");
diff --git a/test/built-ins/Temporal/ZonedDateTime/prototype/until/branding.js b/test/built-ins/Temporal/ZonedDateTime/prototype/until/branding.js
new file mode 100644
index 0000000000..18210ae365
--- /dev/null
+++ b/test/built-ins/Temporal/ZonedDateTime/prototype/until/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.zoneddatetime.prototype.until
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const until = Temporal.ZonedDateTime.prototype.until;
+
+assert.sameValue(typeof until, "function");
+
+assert.throws(TypeError, () => until.call(undefined), "undefined");
+assert.throws(TypeError, () => until.call(null), "null");
+assert.throws(TypeError, () => until.call(true), "true");
+assert.throws(TypeError, () => until.call(""), "empty string");
+assert.throws(TypeError, () => until.call(Symbol()), "symbol");
+assert.throws(TypeError, () => until.call(1), "1");
+assert.throws(TypeError, () => until.call({}), "plain object");
+assert.throws(TypeError, () => until.call(Temporal.ZonedDateTime), "Temporal.ZonedDateTime");
+assert.throws(TypeError, () => until.call(Temporal.ZonedDateTime.prototype), "Temporal.ZonedDateTime.prototype");
diff --git a/test/built-ins/Temporal/ZonedDateTime/prototype/valueOf/branding.js b/test/built-ins/Temporal/ZonedDateTime/prototype/valueOf/branding.js
new file mode 100644
index 0000000000..910dca8913
--- /dev/null
+++ b/test/built-ins/Temporal/ZonedDateTime/prototype/valueOf/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.zoneddatetime.prototype.valueof
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const valueOf = Temporal.ZonedDateTime.prototype.valueOf;
+
+assert.sameValue(typeof valueOf, "function");
+
+assert.throws(TypeError, () => valueOf.call(undefined), "undefined");
+assert.throws(TypeError, () => valueOf.call(null), "null");
+assert.throws(TypeError, () => valueOf.call(true), "true");
+assert.throws(TypeError, () => valueOf.call(""), "empty string");
+assert.throws(TypeError, () => valueOf.call(Symbol()), "symbol");
+assert.throws(TypeError, () => valueOf.call(1), "1");
+assert.throws(TypeError, () => valueOf.call({}), "plain object");
+assert.throws(TypeError, () => valueOf.call(Temporal.ZonedDateTime), "Temporal.ZonedDateTime");
+assert.throws(TypeError, () => valueOf.call(Temporal.ZonedDateTime.prototype), "Temporal.ZonedDateTime.prototype");
diff --git a/test/built-ins/Temporal/ZonedDateTime/prototype/weekOfYear/branding.js b/test/built-ins/Temporal/ZonedDateTime/prototype/weekOfYear/branding.js
new file mode 100644
index 0000000000..3d6377f855
--- /dev/null
+++ b/test/built-ins/Temporal/ZonedDateTime/prototype/weekOfYear/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.zoneddatetime.prototype.weekofyear
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const weekOfYear = Object.getOwnPropertyDescriptor(Temporal.ZonedDateTime.prototype, "weekOfYear").get;
+
+assert.sameValue(typeof weekOfYear, "function");
+
+assert.throws(TypeError, () => weekOfYear.call(undefined), "undefined");
+assert.throws(TypeError, () => weekOfYear.call(null), "null");
+assert.throws(TypeError, () => weekOfYear.call(true), "true");
+assert.throws(TypeError, () => weekOfYear.call(""), "empty string");
+assert.throws(TypeError, () => weekOfYear.call(Symbol()), "symbol");
+assert.throws(TypeError, () => weekOfYear.call(1), "1");
+assert.throws(TypeError, () => weekOfYear.call({}), "plain object");
+assert.throws(TypeError, () => weekOfYear.call(Temporal.ZonedDateTime), "Temporal.ZonedDateTime");
+assert.throws(TypeError, () => weekOfYear.call(Temporal.ZonedDateTime.prototype), "Temporal.ZonedDateTime.prototype");
diff --git a/test/built-ins/Temporal/ZonedDateTime/prototype/with/branding.js b/test/built-ins/Temporal/ZonedDateTime/prototype/with/branding.js
new file mode 100644
index 0000000000..2d9fa03c67
--- /dev/null
+++ b/test/built-ins/Temporal/ZonedDateTime/prototype/with/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.zoneddatetime.prototype.with
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const with_ = Temporal.ZonedDateTime.prototype.with;
+
+assert.sameValue(typeof with_, "function");
+
+assert.throws(TypeError, () => with_.call(undefined), "undefined");
+assert.throws(TypeError, () => with_.call(null), "null");
+assert.throws(TypeError, () => with_.call(true), "true");
+assert.throws(TypeError, () => with_.call(""), "empty string");
+assert.throws(TypeError, () => with_.call(Symbol()), "symbol");
+assert.throws(TypeError, () => with_.call(1), "1");
+assert.throws(TypeError, () => with_.call({}), "plain object");
+assert.throws(TypeError, () => with_.call(Temporal.ZonedDateTime), "Temporal.ZonedDateTime");
+assert.throws(TypeError, () => with_.call(Temporal.ZonedDateTime.prototype), "Temporal.ZonedDateTime.prototype");
diff --git a/test/built-ins/Temporal/ZonedDateTime/prototype/withCalendar/branding.js b/test/built-ins/Temporal/ZonedDateTime/prototype/withCalendar/branding.js
new file mode 100644
index 0000000000..4958c2884c
--- /dev/null
+++ b/test/built-ins/Temporal/ZonedDateTime/prototype/withCalendar/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.zoneddatetime.prototype.withcalendar
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const withCalendar = Temporal.ZonedDateTime.prototype.withCalendar;
+
+assert.sameValue(typeof withCalendar, "function");
+
+assert.throws(TypeError, () => withCalendar.call(undefined), "undefined");
+assert.throws(TypeError, () => withCalendar.call(null), "null");
+assert.throws(TypeError, () => withCalendar.call(true), "true");
+assert.throws(TypeError, () => withCalendar.call(""), "empty string");
+assert.throws(TypeError, () => withCalendar.call(Symbol()), "symbol");
+assert.throws(TypeError, () => withCalendar.call(1), "1");
+assert.throws(TypeError, () => withCalendar.call({}), "plain object");
+assert.throws(TypeError, () => withCalendar.call(Temporal.ZonedDateTime), "Temporal.ZonedDateTime");
+assert.throws(TypeError, () => withCalendar.call(Temporal.ZonedDateTime.prototype), "Temporal.ZonedDateTime.prototype");
diff --git a/test/built-ins/Temporal/ZonedDateTime/prototype/withPlainDate/branding.js b/test/built-ins/Temporal/ZonedDateTime/prototype/withPlainDate/branding.js
new file mode 100644
index 0000000000..5d9df4cbfb
--- /dev/null
+++ b/test/built-ins/Temporal/ZonedDateTime/prototype/withPlainDate/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.zoneddatetime.prototype.withplaindate
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const withPlainDate = Temporal.ZonedDateTime.prototype.withPlainDate;
+
+assert.sameValue(typeof withPlainDate, "function");
+
+assert.throws(TypeError, () => withPlainDate.call(undefined), "undefined");
+assert.throws(TypeError, () => withPlainDate.call(null), "null");
+assert.throws(TypeError, () => withPlainDate.call(true), "true");
+assert.throws(TypeError, () => withPlainDate.call(""), "empty string");
+assert.throws(TypeError, () => withPlainDate.call(Symbol()), "symbol");
+assert.throws(TypeError, () => withPlainDate.call(1), "1");
+assert.throws(TypeError, () => withPlainDate.call({}), "plain object");
+assert.throws(TypeError, () => withPlainDate.call(Temporal.ZonedDateTime), "Temporal.ZonedDateTime");
+assert.throws(TypeError, () => withPlainDate.call(Temporal.ZonedDateTime.prototype), "Temporal.ZonedDateTime.prototype");
diff --git a/test/built-ins/Temporal/ZonedDateTime/prototype/withPlainTime/branding.js b/test/built-ins/Temporal/ZonedDateTime/prototype/withPlainTime/branding.js
new file mode 100644
index 0000000000..471e0f20d8
--- /dev/null
+++ b/test/built-ins/Temporal/ZonedDateTime/prototype/withPlainTime/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.zoneddatetime.prototype.withplaintime
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const withPlainTime = Temporal.ZonedDateTime.prototype.withPlainTime;
+
+assert.sameValue(typeof withPlainTime, "function");
+
+assert.throws(TypeError, () => withPlainTime.call(undefined), "undefined");
+assert.throws(TypeError, () => withPlainTime.call(null), "null");
+assert.throws(TypeError, () => withPlainTime.call(true), "true");
+assert.throws(TypeError, () => withPlainTime.call(""), "empty string");
+assert.throws(TypeError, () => withPlainTime.call(Symbol()), "symbol");
+assert.throws(TypeError, () => withPlainTime.call(1), "1");
+assert.throws(TypeError, () => withPlainTime.call({}), "plain object");
+assert.throws(TypeError, () => withPlainTime.call(Temporal.ZonedDateTime), "Temporal.ZonedDateTime");
+assert.throws(TypeError, () => withPlainTime.call(Temporal.ZonedDateTime.prototype), "Temporal.ZonedDateTime.prototype");
diff --git a/test/built-ins/Temporal/ZonedDateTime/prototype/withTimeZone/branding.js b/test/built-ins/Temporal/ZonedDateTime/prototype/withTimeZone/branding.js
new file mode 100644
index 0000000000..15c0b3379f
--- /dev/null
+++ b/test/built-ins/Temporal/ZonedDateTime/prototype/withTimeZone/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.zoneddatetime.prototype.withtimezone
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const withTimeZone = Temporal.ZonedDateTime.prototype.withTimeZone;
+
+assert.sameValue(typeof withTimeZone, "function");
+
+assert.throws(TypeError, () => withTimeZone.call(undefined), "undefined");
+assert.throws(TypeError, () => withTimeZone.call(null), "null");
+assert.throws(TypeError, () => withTimeZone.call(true), "true");
+assert.throws(TypeError, () => withTimeZone.call(""), "empty string");
+assert.throws(TypeError, () => withTimeZone.call(Symbol()), "symbol");
+assert.throws(TypeError, () => withTimeZone.call(1), "1");
+assert.throws(TypeError, () => withTimeZone.call({}), "plain object");
+assert.throws(TypeError, () => withTimeZone.call(Temporal.ZonedDateTime), "Temporal.ZonedDateTime");
+assert.throws(TypeError, () => withTimeZone.call(Temporal.ZonedDateTime.prototype), "Temporal.ZonedDateTime.prototype");
diff --git a/test/built-ins/Temporal/ZonedDateTime/prototype/year/branding.js b/test/built-ins/Temporal/ZonedDateTime/prototype/year/branding.js
new file mode 100644
index 0000000000..2359e26b9a
--- /dev/null
+++ b/test/built-ins/Temporal/ZonedDateTime/prototype/year/branding.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.zoneddatetime.prototype.year
+description: Throw a TypeError if the receiver is invalid
+features: [Symbol, Temporal]
+---*/
+
+const year = Object.getOwnPropertyDescriptor(Temporal.ZonedDateTime.prototype, "year").get;
+
+assert.sameValue(typeof year, "function");
+
+assert.throws(TypeError, () => year.call(undefined), "undefined");
+assert.throws(TypeError, () => year.call(null), "null");
+assert.throws(TypeError, () => year.call(true), "true");
+assert.throws(TypeError, () => year.call(""), "empty string");
+assert.throws(TypeError, () => year.call(Symbol()), "symbol");
+assert.throws(TypeError, () => year.call(1), "1");
+assert.throws(TypeError, () => year.call({}), "plain object");
+assert.throws(TypeError, () => year.call(Temporal.ZonedDateTime), "Temporal.ZonedDateTime");
+assert.throws(TypeError, () => year.call(Temporal.ZonedDateTime.prototype), "Temporal.ZonedDateTime.prototype");