1 files changed, 20 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Temporal/PlainYearMonth/prototype/subtract/subclassing-ignored.js b/js/src/tests/test262/built-ins/Temporal/PlainYearMonth/prototype/subtract/subclassing-ignored.js
new file mode 100644
index 0000000000..14e0e703f6
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Temporal/PlainYearMonth/prototype/subtract/subclassing-ignored.js
@@ -0,0 +1,20 @@
+// |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.plainyearmonth.prototype.subtract
+description: Objects of a subclass are never created as return values for subtract()
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+TemporalHelpers.checkSubclassingIgnored(
+  Temporal.PlainYearMonth,
+  [2000, 5],
+  "subtract",
+  [{ months: 1 }],
+  (result) => TemporalHelpers.assertPlainYearMonth(result, 2000, 4, "M04"),
+);
+
+reportCompare(0, 0);