1 files changed, 39 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Temporal/Calendar/prototype/dateAdd/add-months-weeks.js b/js/src/tests/test262/built-ins/Temporal/Calendar/prototype/dateAdd/add-months-weeks.js
new file mode 100644
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+++ b/js/src/tests/test262/built-ins/Temporal/Calendar/prototype/dateAdd/add-months-weeks.js
@@ -0,0 +1,39 @@
+// |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 weeks 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 p2m3w = new Temporal.Duration(0,2,3);
+
+TemporalHelpers.assertPlainDate(
+    cal.dateAdd("2020-02-29", p2m3w), 2020, 5, "M05", 20,
+    "add two months 3 weeks from Feb 29 of a leap year");
+TemporalHelpers.assertPlainDate(
+    cal.dateAdd("2020-02-28", p2m3w), 2020, 5, "M05", 19,
+    "add two months 3 weeks from Feb 28 of a leap year");
+TemporalHelpers.assertPlainDate(
+    cal.dateAdd("2021-02-28", p2m3w), 2021, 5, "M05", 19,
+    "add two months 3 weeks from Feb 28 of a non leap year");
+TemporalHelpers.assertPlainDate(
+    cal.dateAdd("2020-12-28", p2m3w), 2021, 3, "M03", 21,
+    "add two months 3 weeks from end of year to non leap year");
+TemporalHelpers.assertPlainDate(
+    cal.dateAdd("2019-12-28", p2m3w), 2020, 3, "M03", 20,
+    "add two months 3 weeks from end of year to leap year");
+TemporalHelpers.assertPlainDate(
+    cal.dateAdd("2019-10-28", p2m3w), 2020, 1, "M01", 18,
+    "add two months 3 weeks and cause roll into a new year");
+TemporalHelpers.assertPlainDate(
+    cal.dateAdd("2019-10-31", p2m3w), 2020, 1, "M01", 21,
+    "add two months 3 weeks and cause roll into a new year");
+
+reportCompare(0, 0);