1 files changed, 26 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Temporal/Calendar/prototype/yearOfWeek/custom-calendar-weekofyear.js b/js/src/tests/test262/built-ins/Temporal/Calendar/prototype/yearOfWeek/custom-calendar-weekofyear.js
new file mode 100644
index 0000000000..6d618ae608
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Temporal/Calendar/prototype/yearOfWeek/custom-calendar-weekofyear.js
@@ -0,0 +1,26 @@
+// |reftest| skip-if(!this.hasOwnProperty('Temporal')) -- Temporal is not enabled unconditionally
+// Copyright (C) 2024 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.prototype.yearofweek
+description: >
+  Temporal.Calendar.prototype.yearOfWeek returns undefined for all 
+  custom calendars where yearOfWeek() returns undefined.
+features: [Temporal]
+---*/
+
+class CustomCalendar extends Temporal.Calendar {
+  constructor() {
+    super("iso8601");
+  }
+  yearOfWeek() {
+    return undefined;
+  }
+}
+
+const calendar = new CustomCalendar();
+const customCalendarDate = { month: 1, day: 1, year: 2024, calendar};
+assert.sameValue(calendar.yearOfWeek({...customCalendarDate}), undefined);
+
+reportCompare(0, 0);