1 files changed, 34 insertions, 0 deletions
diff --git a/js/src/tests/test262/intl402/Locale/prototype/getWeekInfo/firstDay-by-id.js b/js/src/tests/test262/intl402/Locale/prototype/getWeekInfo/firstDay-by-id.js
new file mode 100644
index 0000000000..9eedea5b8c
--- /dev/null
+++ b/js/src/tests/test262/intl402/Locale/prototype/getWeekInfo/firstDay-by-id.js
@@ -0,0 +1,34 @@
+// |reftest| skip -- Intl.Locale-info is not supported
+// Copyright 2023 Google Inc. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-intl.locale.prototype.getWeekInfo
+description: >
+    Checks that the return value of Intl.Locale.prototype.getWeekInfo is an Object
+    with the correct keys and properties.
+info: |
+  get Intl.Locale.prototype.getWeekInfo
+  ...
+  6. Perform ! CreateDataPropertyOrThrow(info, "firstDay", wi.[[FirstDay]]).
+features: [Reflect,Intl.Locale,Intl.Locale-info]
+---*/
+
+const validFirstDayOfWeekIds = [
+  ["en-u-fw-mon", 1],
+  ["en-u-fw-tue", 2],
+  ["en-u-fw-wed", 3],
+  ["en-u-fw-thu", 4],
+  ["en-u-fw-fri", 5],
+  ["en-u-fw-sat", 6],
+  ["en-u-fw-sun", 7],
+];
+for (const [id, expected] of validFirstDayOfWeekIds) {
+  assert.sameValue(
+    new Intl.Locale(id).getWeekInfo().firstDay,
+    expected,
+    `new Intl.Locale(${id}).getWeekInfo().firstDay returns "${expected}"`
+  );
+}
+
+reportCompare(0, 0);