1 files changed, 25 insertions, 0 deletions
diff --git a/js/src/tests/test262/intl402/Temporal/PlainDate/prototype/yearOfWeek/non-iso-week-of-year.js b/js/src/tests/test262/intl402/Temporal/PlainDate/prototype/yearOfWeek/non-iso-week-of-year.js
new file mode 100644
index 0000000000..047166e765
--- /dev/null
+++ b/js/src/tests/test262/intl402/Temporal/PlainDate/prototype/yearOfWeek/non-iso-week-of-year.js
@@ -0,0 +1,25 @@
+// |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.plaindate.prototype.yearofweek
+description: >
+  Temporal.PlainDate.prototype.yearOfWeek returns undefined for all 
+  non-ISO calendars without a well-defined week numbering system.
+features: [Temporal]
+---*/
+
+// Gregorian calendar has a well defined week-numbering system.
+
+let calendar = new Temporal.Calendar("gregory");
+const date = new Temporal.PlainDate(2024, 1, 1, calendar);
+
+assert.sameValue(date.yearOfWeek, 2024);
+
+calendar = new Temporal.Calendar("hebrew");
+const nonisodate = new Temporal.PlainDate(2024, 1, 1, calendar);
+
+assert.sameValue(nonisodate.yearOfWeek, undefined);
+
+reportCompare(0, 0);