diff --git a/test/built-ins/Temporal/PlainDate/prototype/daysInYear/basic.js b/test/built-ins/Temporal/PlainDate/prototype/daysInYear/basic.js
new file mode 100644
index 0000000000..a2baf7200c
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDate/prototype/daysInYear/basic.js
@@ -0,0 +1,11 @@
+// Copyright (C) 2022 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: Basic tests for daysInYear.
+features: [Temporal]
+---*/
+
+assert.sameValue((new Temporal.PlainDate(1976, 11, 18)).daysInYear, 366, "leap year");
+assert.sameValue((new Temporal.PlainDate(1977, 11, 18)).daysInYear, 365, "non-leap year");
diff --git a/test/built-ins/Temporal/PlainDate/prototype/inLeapYear/basic.js b/test/built-ins/Temporal/PlainDate/prototype/inLeapYear/basic.js
new file mode 100644
index 0000000000..f6def8ca81
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDate/prototype/inLeapYear/basic.js
@@ -0,0 +1,13 @@
+// Copyright (C) 2022 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: Basic test for inLeapYear
+features: [Temporal]
+---*/
+
+assert.sameValue((new Temporal.PlainDate(1976, 11, 18)).inLeapYear,
+  true, "leap year");
+assert.sameValue((new Temporal.PlainDate(1977, 11, 18)).inLeapYear,
+  false, "non-leap year");
diff --git a/test/built-ins/Temporal/PlainDateTime/prototype/daysInYear/basic.js b/test/built-ins/Temporal/PlainDateTime/prototype/daysInYear/basic.js
index d3c7a5d8a9..25b7778377 100644
--- a/test/built-ins/Temporal/PlainDateTime/prototype/daysInYear/basic.js
+++ b/test/built-ins/Temporal/PlainDateTime/prototype/daysInYear/basic.js
@@ -7,6 +7,7 @@ description: Checking days in year for a "normal" case (non-undefined, non-bound
 features: [Temporal]
 ---*/
 
-const calendar = Temporal.Calendar.from("iso8601");
-const datetime = new Temporal.PlainDateTime(1976, 11, 18, 15, 23, 30, 123, 456, 789, calendar);
-assert.sameValue(datetime.daysInYear, 366, "check days in year information");
+assert.sameValue((new Temporal.PlainDateTime(1976, 11, 18, 15, 23, 30, 123, 456, 789)).daysInYear,
+  366, "leap year");
+assert.sameValue((new Temporal.PlainDateTime(1977, 11, 18, 15, 23, 30, 123, 456, 789)).daysInYear,
+  365, "non-leap year");
diff --git a/test/built-ins/Temporal/PlainDateTime/prototype/inLeapYear/basic.js b/test/built-ins/Temporal/PlainDateTime/prototype/inLeapYear/basic.js
new file mode 100644
index 0000000000..b620522f32
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDateTime/prototype/inLeapYear/basic.js
@@ -0,0 +1,13 @@
+// Copyright (C) 2022 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: Basic test for inLeapYear
+features: [Temporal]
+---*/
+
+assert.sameValue((new Temporal.PlainDateTime(1976, 11, 18, 15, 23, 30, 123, 456, 789)).inLeapYear,
+  true, "leap year");
+assert.sameValue((new Temporal.PlainDateTime(1977, 11, 18, 15, 23, 30, 123, 456, 789)).inLeapYear,
+  false, "non-leap year");
diff --git a/test/built-ins/Temporal/PlainYearMonth/prototype/daysInYear/basic.js b/test/built-ins/Temporal/PlainYearMonth/prototype/daysInYear/basic.js
index f17cde06c5..1f3679b60f 100644
--- a/test/built-ins/Temporal/PlainYearMonth/prototype/daysInYear/basic.js
+++ b/test/built-ins/Temporal/PlainYearMonth/prototype/daysInYear/basic.js
@@ -7,5 +7,5 @@ description: daysInYear works
 features: [Temporal]
 ---*/
 
-const ym = new Temporal.PlainYearMonth(1976, 11);
-assert.sameValue(ym.daysInYear, 366);
+assert.sameValue((new Temporal.PlainYearMonth(1976, 11)).daysInYear, 366, "leap year");
+assert.sameValue((new Temporal.PlainYearMonth(1977, 11)).daysInYear, 365, "non-leap year");
diff --git a/test/built-ins/Temporal/PlainYearMonth/prototype/inLeapYear/basic.js b/test/built-ins/Temporal/PlainYearMonth/prototype/inLeapYear/basic.js
new file mode 100644
index 0000000000..00cc891761
--- /dev/null
+++ b/test/built-ins/Temporal/PlainYearMonth/prototype/inLeapYear/basic.js
@@ -0,0 +1,13 @@
+// Copyright (C) 2022 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: Basic test for inLeapYear
+features: [Temporal]
+---*/
+
+assert.sameValue((new Temporal.PlainYearMonth(1976, 11)).inLeapYear,
+  true, "leap year");
+assert.sameValue((new Temporal.PlainYearMonth(1977, 11)).inLeapYear,
+  false, "non-leap year");
diff --git a/test/built-ins/Temporal/ZonedDateTime/prototype/daysInYear/basic.js b/test/built-ins/Temporal/ZonedDateTime/prototype/daysInYear/basic.js
new file mode 100644
index 0000000000..432e32d38b
--- /dev/null
+++ b/test/built-ins/Temporal/ZonedDateTime/prototype/daysInYear/basic.js
@@ -0,0 +1,13 @@
+// Copyright (C) 2022 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: Checking days in year for a "normal" case (non-undefined, non-boundary case, etc.)
+features: [Temporal]
+---*/
+
+assert.sameValue((new Temporal.ZonedDateTime(217178610123456789n, "UTC")).daysInYear,
+  366, "leap year");
+assert.sameValue((new Temporal.ZonedDateTime(248714610123456789n, "UTC")).daysInYear,
+  365, "non-leap year");
diff --git a/test/built-ins/Temporal/ZonedDateTime/prototype/inLeapYear/basic.js b/test/built-ins/Temporal/ZonedDateTime/prototype/inLeapYear/basic.js
new file mode 100644
index 0000000000..5ea775944f
--- /dev/null
+++ b/test/built-ins/Temporal/ZonedDateTime/prototype/inLeapYear/basic.js
@@ -0,0 +1,13 @@
+// Copyright (C) 2022 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: Basic test for inLeapYear
+features: [Temporal]
+---*/
+
+assert.sameValue((new Temporal.ZonedDateTime(217178610123456789n, "UTC")).inLeapYear,
+  true, "leap year");
+assert.sameValue((new Temporal.ZonedDateTime(248714610123456789n, "UTC")).inLeapYear,
+  false, "non-leap year");