1 files changed, 20 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Temporal/Calendar/subclass.js b/js/src/tests/test262/built-ins/Temporal/Calendar/subclass.js
new file mode 100644
index 0000000000..cb13924cf3
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Temporal/Calendar/subclass.js
@@ -0,0 +1,20 @@
+// |reftest| skip-if(!this.hasOwnProperty('Temporal')) -- Temporal is not enabled unconditionally
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar
+description: Test for Temporal.Calendar subclassing.
+features: [Temporal]
+---*/
+
+class CustomCalendar extends Temporal.Calendar {
+}
+
+const instance = new CustomCalendar("iso8601");
+assert.sameValue(instance.toString(), "iso8601");
+assert.sameValue(Object.getPrototypeOf(instance), CustomCalendar.prototype, "Instance of CustomCalendar");
+assert(instance instanceof CustomCalendar, "Instance of CustomCalendar");
+assert(instance instanceof Temporal.Calendar, "Instance of Temporal.Calendar");
+
+reportCompare(0, 0);