diff --git a/test/built-ins/Temporal/PlainDateTime/prototype/equals/basic.js b/test/built-ins/Temporal/PlainDateTime/prototype/equals/basic.js
index c83cffeef4e..72133b1e514 100644
--- a/test/built-ins/Temporal/PlainDateTime/prototype/equals/basic.js
+++ b/test/built-ins/Temporal/PlainDateTime/prototype/equals/basic.js
@@ -9,6 +9,12 @@ features: [Temporal]
 
 const dt1 = new Temporal.PlainDateTime(1976, 11, 18, 15, 23, 30, 123, 456, 789);
 const dt2 = new Temporal.PlainDateTime(2019, 10, 29, 10, 46, 38, 271, 986, 102);
+const dt3 = new Temporal.PlainDateTime(2019, 10, 29, 10, 46, 38, 271, 986, 102);
+const dt4 = new Temporal.PlainDateTime(2019, 10, 29, 15, 23, 30, 123, 456, 789);
+const dt5 = new Temporal.PlainDateTime(1976, 11, 18, 10, 46, 38, 271, 986, 102);
 
 assert.sameValue(dt1.equals(dt1), true, "equal");
 assert.sameValue(dt1.equals(dt2), false, "unequal");
+assert.sameValue(dt2.equals(dt3), true, "equal with different objects");
+assert.sameValue(dt2.equals(dt4), false, "same date, different time");
+assert.sameValue(dt2.equals(dt5), false, "same time, different date");
diff --git a/test/built-ins/Temporal/PlainDateTime/prototype/equals/calendar-checked.js b/test/built-ins/Temporal/PlainDateTime/prototype/equals/calendar-checked.js
new file mode 100644
index 00000000000..de8dfabf30e
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDateTime/prototype/equals/calendar-checked.js
@@ -0,0 +1,36 @@
+// Copyright (C) 2022 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: Calendar is taken into account if the ISO data is equal
+includes: [compareArray.js,temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const actual = [];
+const calendar1 = TemporalHelpers.toPrimitiveObserver(actual, "A", "calendar1");
+const calendar2 = TemporalHelpers.toPrimitiveObserver(actual, "A", "calendar2");
+const calendar3 = TemporalHelpers.toPrimitiveObserver(actual, "B", "calendar3");
+const dt1 = new Temporal.PlainDateTime(1976, 11, 18, 15, 23, 30, 123, 456, 789, calendar1);
+const dt1b = new Temporal.PlainDateTime(1976, 11, 18, 15, 23, 30, 123, 456, 789, calendar1);
+const dt2 = new Temporal.PlainDateTime(1976, 11, 18, 15, 23, 30, 123, 456, 789, calendar2);
+const dt3 = new Temporal.PlainDateTime(1976, 11, 18, 15, 23, 30, 123, 456, 789, calendar3);
+
+assert.sameValue(dt1.equals(dt1b), true, "same calendar object");
+assert.compareArray(actual, []);
+
+assert.sameValue(dt1.equals(dt2), true, "same calendar string");
+assert.compareArray(actual, ["get calendar1.toString", "call calendar1.toString", "get calendar2.toString", "call calendar2.toString"]);
+
+actual.splice(0, actual.length);  // empty it for the next check
+assert.sameValue(dt1.equals(dt3), false, "different calendar string");
+assert.compareArray(actual, ["get calendar1.toString", "call calendar1.toString", "get calendar3.toString", "call calendar3.toString"]);
+
+const calendar4 = { toString() { throw new Test262Error("should not call calendar4.toString") } };
+const calendar5 = { toString() { throw new Test262Error("should not call calendar5.toString") } };
+const dt4 = new Temporal.PlainDateTime(1976, 11, 18, 15, 23, 30, 123, 456, 789, calendar4);
+const dt5 = new Temporal.PlainDateTime(2019, 10, 29, 10, 46, 38, 271, 986, 102, calendar4);
+const dt6 = new Temporal.PlainDateTime(2019, 10, 29, 10, 46, 38, 271, 986, 102, calendar5);
+assert.sameValue(dt4.equals(dt5), false, "not equal same calendar");
+assert.sameValue(dt4.equals(dt6), false, "not equal different calendar");