1 files changed, 27 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Temporal/ZonedDateTime/prototype/yearOfWeek/custom-calendar-weekofyear.js b/js/src/tests/test262/built-ins/Temporal/ZonedDateTime/prototype/yearOfWeek/custom-calendar-weekofyear.js
new file mode 100644
index 0000000000..331002f262
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Temporal/ZonedDateTime/prototype/yearOfWeek/custom-calendar-weekofyear.js
@@ -0,0 +1,27 @@
+// |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.zoneddatetime.prototype.yearofweek
+description: >
+  Temporal.ZonedDateTime.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();
+// Epoch Nanoseconds for new Temporal.PlainDateTime(2024, 1, 1, 12, 34, 56, 987, 654, 321, calendar);
+const customCalendarDate = new Temporal.ZonedDateTime(1_704_112_496_987_654_321n, "UTC", calendar);
+assert.sameValue(customCalendarDate.yearOfWeek, undefined);
+
+reportCompare(0, 0);