From ba3b432a1c05422d4e7f500d629b86d24979c46b Mon Sep 17 00:00:00 2001
From: Ben Allen <benallen@igalia.com>
Date: Sun, 2 Nov 2025 17:26:04 -0800
Subject: [PATCH] Added tests to Temporal.PlainDate, Temporal.PlainDateTime,
 and Temporal.ZonedDateTime ensuring weekOfYear only defined for "iso8601"
 calendar

---
 .../from/week-numbers-only-in-iso-8601.js     | 47 ++++++++++++++++++
 .../from/week-numbers-only-in-iso-8601.js     | 47 ++++++++++++++++++
 .../from/week-numbers-only-in-iso-8601.js     | 49 +++++++++++++++++++
 3 files changed, 143 insertions(+)
 create mode 100644 test/intl402/Temporal/PlainDate/from/week-numbers-only-in-iso-8601.js
 create mode 100644 test/intl402/Temporal/PlainDateTime/from/week-numbers-only-in-iso-8601.js
 create mode 100644 test/intl402/Temporal/ZonedDateTime/from/week-numbers-only-in-iso-8601.js

diff --git a/test/intl402/Temporal/PlainDate/from/week-numbers-only-in-iso-8601.js b/test/intl402/Temporal/PlainDate/from/week-numbers-only-in-iso-8601.js
new file mode 100644
index 00000000000..8833adbf200
--- /dev/null
+++ b/test/intl402/Temporal/PlainDate/from/week-numbers-only-in-iso-8601.js
@@ -0,0 +1,47 @@
+// Copyright (C) 2025 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaindate.from
+description: Ensures that `"iso8601"` only calendar with non-`undefined` `weekOfYear`
+features: [Temporal, Intl.Era-monthcode]
+---*/
+
+const nonIsoCalendars = [
+  "buddhist",
+  "chinese",
+  "coptic",
+  "dangi",
+  "ethioaa",
+  "ethiopic",
+  "ethiopic-amete-alem",
+  "gregory",
+  "hebrew",
+  "indian",
+  "islamic-civil",
+  "islamic-tbla",
+  "islamic-umalqura",
+  "islamicc",
+  "japanese",
+  "persian",
+  "roc"
+];
+
+for (const calendar of nonIsoCalendars){
+  const plainDate = Temporal.PlainDate.from({
+    calendar,
+    year: 1,
+    month: 1,
+    day: 1
+  });
+  assert.sameValue(calendar.weekOfYear === undefined, true, "weekOfYear for " + calendar.calendarId + " should be undefined");
+}
+
+const isoCalendar = Temporal.PlainDate.from({
+  calendar: "iso8601",
+  year: 1,
+  month: 1,
+  day: 1,
+});
+
+assert.sameValue(isoCalendar.weekOfYear !== undefined, true, "weekOfYear should not be undefined for 'iso8601' calendar");
diff --git a/test/intl402/Temporal/PlainDateTime/from/week-numbers-only-in-iso-8601.js b/test/intl402/Temporal/PlainDateTime/from/week-numbers-only-in-iso-8601.js
new file mode 100644
index 00000000000..cf4da0a92fb
--- /dev/null
+++ b/test/intl402/Temporal/PlainDateTime/from/week-numbers-only-in-iso-8601.js
@@ -0,0 +1,47 @@
+// Copyright (C) 2025 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaindatetime.from
+description: Ensures that `"iso8601"` only calendar with non-`undefined` `weekOfYear`
+features: [Temporal, Intl.Era-monthcode]
+---*/
+
+const nonIsoCalendars = [
+  "buddhist",
+  "chinese",
+  "coptic",
+  "dangi",
+  "ethioaa",
+  "ethiopic",
+  "ethiopic-amete-alem",
+  "gregory",
+  "hebrew",
+  "indian",
+  "islamic-civil",
+  "islamic-tbla",
+  "islamic-umalqura",
+  "islamicc",
+  "japanese",
+  "persian",
+  "roc"
+];
+
+for (const calendar of nonIsoCalendars){
+  const plainDate = Temporal.PlainDateTime.from({
+    calendar,
+    year: 1,
+    month: 1,
+    day: 1
+  });
+  assert.sameValue(calendar.weekOfYear === undefined, true, "weekOfYear for " + calendar.calendarId + " should be undefined");
+}
+
+const isoCalendar = Temporal.PlainDateTime.from({
+  calendar: "iso8601",
+  year: 1,
+  month: 1,
+  day: 1,
+});
+
+assert.sameValue(isoCalendar.weekOfYear !== undefined, true, "weekOfYear should not be undefined for 'iso8601' calendar");
diff --git a/test/intl402/Temporal/ZonedDateTime/from/week-numbers-only-in-iso-8601.js b/test/intl402/Temporal/ZonedDateTime/from/week-numbers-only-in-iso-8601.js
new file mode 100644
index 00000000000..a994a8dd036
--- /dev/null
+++ b/test/intl402/Temporal/ZonedDateTime/from/week-numbers-only-in-iso-8601.js
@@ -0,0 +1,49 @@
+// Copyright (C) 2025 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.zoneddatetime.from
+description: Ensures that `"iso8601"` only calendar with non-`undefined` `weekOfYear`
+features: [Temporal, Intl.Era-monthcode]
+---*/
+
+const nonIsoCalendars = [
+  "buddhist",
+  "chinese",
+  "coptic",
+  "dangi",
+  "ethioaa",
+  "ethiopic",
+  "ethiopic-amete-alem",
+  "gregory",
+  "hebrew",
+  "indian",
+  "islamic-civil",
+  "islamic-tbla",
+  "islamic-umalqura",
+  "islamicc",
+  "japanese",
+  "persian",
+  "roc"
+];
+
+for (const calendar of nonIsoCalendars){
+  const plainDate = Temporal.ZonedDateTime.from({
+    calendar,
+    year: 1,
+    month: 1,
+    day: 1,
+    timeZone: "UTC"
+  });
+  assert.sameValue(calendar.weekOfYear === undefined, true, "weekOfYear for " + calendar.calendarId + " should be undefined");
+}
+
+const isoCalendar = Temporal.ZonedDateTime.from({
+  calendar: "iso8601",
+  year: 1,
+  month: 1,
+  day: 1,
+  timeZone: "UTC"
+});
+
+assert.sameValue(isoCalendar.weekOfYear !== undefined, true, "weekOfYear should not be undefined for 'iso8601' calendar");