diff --git a/test/built-ins/Temporal/PlainDate/prototype/equals/argument-object-invalid.js b/test/built-ins/Temporal/PlainDate/prototype/equals/argument-object-invalid.js
new file mode 100644
index 0000000000..5755940fdc
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDate/prototype/equals/argument-object-invalid.js
@@ -0,0 +1,20 @@
+// 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: Appropriate error thrown when object argument is invalid
+features: [Temporal]
+---*/
+
+const instance = Temporal.PlainDate.from({ year: 2000, month: 5, day: 2 });
+
+// End up in ISODateFromFields with missing fields
+assert.throws(TypeError, () => instance.equals({}), "plain object");
+assert.throws(TypeError, () => instance.equals({ year: 1972, month: 7 }), "only year, month");
+assert.throws(TypeError, () => instance.equals({ year: 1972, month: 7 }), "only year, month");
+assert.throws(TypeError, () => instance.equals({ year: 1972, day: 7 }), "only year, day");
+assert.throws(TypeError, () => instance.equals(Temporal.PlainDate), "Temporal.PlainDate");
+
+// Tries to get fields with an invalid receiver
+assert.throws(TypeError, () => instance.equals(Temporal.PlainDate.prototype), "Temporal.PlainDate.prototype");
diff --git a/test/built-ins/Temporal/PlainDate/prototype/equals/argument-object-valid.js b/test/built-ins/Temporal/PlainDate/prototype/equals/argument-object-valid.js
new file mode 100644
index 0000000000..c87e6925d9
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDate/prototype/equals/argument-object-valid.js
@@ -0,0 +1,16 @@
+// 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: equals with a valid property bag
+features: [Temporal]
+---*/
+
+const instance = new Temporal.PlainDate(2000, 5, 2);
+assert.sameValue(instance.equals({ year: 2000, month: 5, day: 2 }), true, "same date");
+assert.sameValue(instance.equals({ year: 2000, month: 5, day: 4 }), false, "different date");
+
+const calendar = { toString() { return "a" } };
+assert.sameValue(instance.withCalendar(calendar).equals({ year: 2000, month: 5, day: 2 }),
+  false, "different calendar");
diff --git a/test/built-ins/Temporal/PlainDate/prototype/equals/argument-string.js b/test/built-ins/Temporal/PlainDate/prototype/equals/argument-string.js
new file mode 100644
index 0000000000..85e28ca874
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDate/prototype/equals/argument-string.js
@@ -0,0 +1,15 @@
+// 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.equals
+description: equals with a valid string
+features: [Temporal]
+---*/
+
+const instance = new Temporal.PlainDate(2000, 5, 2);
+assert.sameValue(instance.equals("2000-05-02"), true, "same date");
+assert.sameValue(instance.equals("2000-05-04"), false, "different date");
+
+const calendar = { toString() { return "a" } };
+assert.sameValue(instance.withCalendar(calendar).equals("2000-05-02"), false, "different calendar");
diff --git a/test/built-ins/Temporal/PlainDate/prototype/equals/argument-wrong-type.js b/test/built-ins/Temporal/PlainDate/prototype/equals/argument-wrong-type.js
index 2e8088d767..2f61141c08 100644
--- a/test/built-ins/Temporal/PlainDate/prototype/equals/argument-wrong-type.js
+++ b/test/built-ins/Temporal/PlainDate/prototype/equals/argument-wrong-type.js
@@ -15,6 +15,3 @@ assert.throws(RangeError, () => instance.equals(true), "true");
 assert.throws(RangeError, () => instance.equals(""), "empty string");
 assert.throws(TypeError, () => instance.equals(Symbol()), "symbol");
 assert.throws(RangeError, () => instance.equals(1), "1");
-assert.throws(TypeError, () => instance.equals({}), "plain object");
-assert.throws(TypeError, () => instance.equals(Temporal.PlainDate), "Temporal.PlainDate");
-assert.throws(TypeError, () => instance.equals(Temporal.PlainDate.prototype), "Temporal.PlainDate.prototype");
diff --git a/test/built-ins/Temporal/PlainDate/prototype/equals/basic.js b/test/built-ins/Temporal/PlainDate/prototype/equals/basic.js
new file mode 100644
index 0000000000..3bb19205ba
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDate/prototype/equals/basic.js
@@ -0,0 +1,15 @@
+// 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.protoype.equals
+description: basic tests
+features: [Temporal]
+---*/
+
+const date1 = new Temporal.PlainDate(1976, 11, 18);
+const date2 = new Temporal.PlainDate(1914, 2, 23);
+const date3 = new Temporal.PlainDate(1914, 2, 23);
+assert.sameValue(date1.equals(date2), false, "different dates");
+assert.sameValue(date2.equals(date3), true, "same dates");
+assert.sameValue(date2.equals(date2), true, "same objects");
diff --git a/test/built-ins/Temporal/PlainDate/prototype/equals/calendar-call-different.js b/test/built-ins/Temporal/PlainDate/prototype/equals/calendar-call-different.js
new file mode 100644
index 0000000000..b1e30dd710
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDate/prototype/equals/calendar-call-different.js
@@ -0,0 +1,30 @@
+// 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.protoype.equals
+description: test if the calendar is compared
+features: [Temporal]
+---*/
+
+class CalendarTraceToString extends Temporal.Calendar {
+  constructor(id) {
+    super("iso8601");
+    this.id_ = id;
+    this.calls = 0;
+  }
+  toString() {
+    ++this.calls;
+    return this.id_;
+  }
+};
+
+const calendar1 = new CalendarTraceToString("a");
+const date1 = new Temporal.PlainDate(1914, 2, 23, calendar1);
+
+const calendar2 = new CalendarTraceToString("b");
+const date2 = new Temporal.PlainDate(1914, 2, 23, calendar2);
+
+assert.sameValue(date1.equals(date2), false, "different calendars");
+assert.sameValue(calendar1.calls, 1, "calendar1 toString() calls");
+assert.sameValue(calendar2.calls, 1, "calendar2 toString() calls");
diff --git a/test/built-ins/Temporal/PlainDate/prototype/equals/calendar-call-same.js b/test/built-ins/Temporal/PlainDate/prototype/equals/calendar-call-same.js
new file mode 100644
index 0000000000..2fea62c77e
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDate/prototype/equals/calendar-call-same.js
@@ -0,0 +1,30 @@
+// 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.protoype.equals
+description: test if the calendar is compared
+features: [Temporal]
+---*/
+
+class CalendarTraceToString extends Temporal.Calendar {
+  constructor(id) {
+    super("iso8601");
+    this.id_ = id;
+    this.calls = 0;
+  }
+  toString() {
+    ++this.calls;
+    return this.id_;
+  }
+};
+
+const calendar1 = new CalendarTraceToString("a");
+const date1 = new Temporal.PlainDate(1914, 2, 23, calendar1);
+
+const calendar2 = new CalendarTraceToString("a");
+const date2 = new Temporal.PlainDate(1914, 2, 23, calendar2);
+
+assert.sameValue(date1.equals(date2), true, "same calendar id");
+assert.sameValue(calendar1.calls, 1, "calendar1 toString() calls");
+assert.sameValue(calendar2.calls, 1, "calendar2 toString() calls");
diff --git a/test/built-ins/Temporal/PlainDate/prototype/equals/calendar-no-call.js b/test/built-ins/Temporal/PlainDate/prototype/equals/calendar-no-call.js
new file mode 100644
index 0000000000..95f485fa49
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDate/prototype/equals/calendar-no-call.js
@@ -0,0 +1,30 @@
+// 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.protoype.equals
+description: test if the calendar is compared
+features: [Temporal]
+---*/
+
+class CalendarTraceToString extends Temporal.Calendar {
+  constructor(id) {
+    super("iso8601");
+    this.id_ = id;
+    this.calls = 0;
+  }
+  toString() {
+    ++this.calls;
+    return this.id_;
+  }
+};
+
+const calendar1 = new CalendarTraceToString("a");
+const date1 = new Temporal.PlainDate(1914, 2, 23, calendar1);
+
+const calendar2 = new CalendarTraceToString("b");
+const date2 = new Temporal.PlainDate(1914, 2, 22, calendar2);
+
+assert.sameValue(date1.equals(date2), false, "different ISO dates");
+assert.sameValue(calendar1.calls, 0, "calendar1 toString() calls");
+assert.sameValue(calendar2.calls, 0, "calendar2 toString() calls");