1 files changed, 21 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Temporal/Calendar/prototype/monthsInYear/argument-string.js b/js/src/tests/test262/built-ins/Temporal/Calendar/prototype/monthsInYear/argument-string.js
new file mode 100644
index 0000000000..ef3a529db2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Temporal/Calendar/prototype/monthsInYear/argument-string.js
@@ -0,0 +1,21 @@
+// |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.monthsinyear
+description: An ISO 8601 date string should be converted as input
+info: |
+  a. Perform ? ToTemporalDate(temporalDateLike).
+  5. Return 12𝔽.
+features: [Temporal]
+---*/
+
+let cal = new Temporal.Calendar("iso8601");
+
+assert.sameValue(cal.monthsInYear("3456-12-20"), 12);
+assert.sameValue(cal.monthsInYear("+000998-01-28"), 12);
+assert.sameValue(cal.monthsInYear("3456-12-20T03:04:05+00:00[UTC]"), 12);
+assert.sameValue(cal.monthsInYear("+000998-01-28T03:04:05+00:00[UTC]"), 12);
+
+reportCompare(0, 0);