1 files changed, 32 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Temporal/PlainDate/prototype/toPlainYearMonth/calendar-arguments.js b/js/src/tests/test262/built-ins/Temporal/PlainDate/prototype/toPlainYearMonth/calendar-arguments.js
new file mode 100644
index 0000000000..af062b81de
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Temporal/PlainDate/prototype/toPlainYearMonth/calendar-arguments.js
@@ -0,0 +1,32 @@
+// |reftest| skip-if(!this.hasOwnProperty('Temporal')) -- Temporal is not enabled unconditionally
+// 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.toplainyearmonth
+description: Correct options value is passed to calendar method
+info: |
+    YearMonthFromFields ( calendar, fields [ , options ] )
+
+    3. If options is not present, then
+        a. Set options to undefined.
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+class CustomCalendar extends Temporal.Calendar {
+  constructor() {
+    super("iso8601");
+  }
+  yearMonthFromFields(...args) {
+    assert.sameValue(args.length, 2, "args.length");
+    assert.sameValue(typeof args[0], "object", "args[0]");
+    assert.sameValue(args[1], undefined, "args[1]");
+    return super.yearMonthFromFields(...args);
+  }
+}
+const plainDate = new Temporal.PlainDate(2000, 5, 2, new CustomCalendar());
+const result = plainDate.toPlainYearMonth();
+TemporalHelpers.assertPlainYearMonth(result, 2000, 5, "M05");
+
+reportCompare(0, 0);