1 files changed, 22 insertions, 0 deletions
diff --git a/js/src/tests/test262/intl402/Locale/prototype/calendar/canonicalize.js b/js/src/tests/test262/intl402/Locale/prototype/calendar/canonicalize.js
new file mode 100644
index 0000000000..5ade4fe795
--- /dev/null
+++ b/js/src/tests/test262/intl402/Locale/prototype/calendar/canonicalize.js
@@ -0,0 +1,22 @@
+// Copyright 2024 Google Inc.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-apply-unicode-extension-to-tag
+description: Checks canonicalize value of extension in ApplyUnicodeExtensionToTag.
+info: |
+    ApplyUnicodeExtensionToTag
+     1. Let _optionsUValue_ be the ASCII-lowercase of _optionsValue_.
+     1. Set _value_ to the String value resulting from canonicalizing _optionsUValue_ as a value of key _key_ per <a href="https://unicode.org/reports/tr35/#processing-localeids">Unicode Technical Standard #35 Part 1 Core, Annex C LocaleId Canonicalization Section 5 Canonicalizing Syntax, Processing LocaleIds</a>.
+features: [Intl.Locale]
+---*/
+
+const loc = new Intl.Locale('en', {calendar: 'islamicc'});
+
+assert.sameValue(loc.toString(), "en-u-ca-islamic-civil",
+    "'islamicc' should be canonicalize to 'islamic-civil'");
+
+assert.sameValue(loc.calendar, "islamic-civil",
+    "'islamicc' should be canonicalize to 'islamic-civil'");
+
+reportCompare(0, 0);