1 files changed, 36 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Temporal/Calendar/prototype/dateAdd/add-months.js b/js/src/tests/test262/built-ins/Temporal/Calendar/prototype/dateAdd/add-months.js
new file mode 100644
index 0000000000..592b16f2fe
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+++ b/js/src/tests/test262/built-ins/Temporal/Calendar/prototype/dateAdd/add-months.js
@@ -0,0 +1,36 @@
+// |reftest| skip-if(!this.hasOwnProperty('Temporal')) -- Temporal is not enabled unconditionally
+// Copyright (C) 2021 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.prototype.dateadd
+description: Temporal.Calendar.prototype.dateAdd add duration with months and calculate correctly
+info: |
+  8. Let result be ? AddISODate(date.[[ISOYear]], date.[[ISOMonth]], date.[[ISODay]], duration.[[Years]], duration.[[Months]], duration.[[Weeks]], duration.[[Days]], overflow).
+features: [Temporal]
+includes: [temporalHelpers.js]
+---*/
+let cal = new Temporal.Calendar("iso8601");
+
+let p5m = new Temporal.Duration(0, 5);
+
+TemporalHelpers.assertPlainDate(
+    cal.dateAdd("2021-07-16", p5m), 2021, 12, "M12", 16,
+    "add five months and result in the same year");
+TemporalHelpers.assertPlainDate(
+    cal.dateAdd("2021-08-16", p5m), 2022, 1, "M01", 16,
+    "add five months and result in the next year");
+TemporalHelpers.assertPlainDate(
+    cal.dateAdd("2021-10-31", p5m), 2022, 3, "M03", 31,
+    "add five months and result in the next year in end of month");
+TemporalHelpers.assertPlainDate(
+    cal.dateAdd("2019-10-01", p5m), 2020, 3, "M03", 1,
+    "add five months and result in the next year in end of month on leap year");
+TemporalHelpers.assertPlainDate(
+    cal.dateAdd("2021-09-30", p5m), 2022, 2, "M02", 28,
+    "add five months and result in the nexdt year and constrain to Feb 28");
+TemporalHelpers.assertPlainDate(
+    cal.dateAdd("2019-09-30", p5m), 2020, 2, "M02", 29,
+    "add five months and result in the nexdt year and constrain to Feb 29 on leap year");
+
+reportCompare(0, 0);