1 files changed, 12 insertions, 0 deletions
diff --git a/deps/v8/test/mjsunit/temporal/plain-date-to-plain-year-month.js b/deps/v8/test/mjsunit/temporal/plain-date-to-plain-year-month.js
new file mode 100644
index 0000000000..ed0124cc1c
--- /dev/null
+++ b/deps/v8/test/mjsunit/temporal/plain-date-to-plain-year-month.js
@@ -0,0 +1,12 @@
+// Copyright 2021 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+// Flags: --harmony-temporal
+
+d8.file.execute('test/mjsunit/temporal/temporal-helpers.js');
+
+let d1 = new Temporal.PlainDate(2021, 12, 11);
+let badDate = { toPlainYearMonth: d1.toPlainYearMonth }
+assertThrows(() => badDate.toPlainYearMonth(), TypeError);
+
+assertPlainYearMonth(d1.toPlainYearMonth(), 2021, 12);