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diff --git a/js/src/tests/test262/intl402/supportedLocalesOf-duplicate-elements-removed.js b/js/src/tests/test262/intl402/supportedLocalesOf-duplicate-elements-removed.js
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+++ b/js/src/tests/test262/intl402/supportedLocalesOf-duplicate-elements-removed.js
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+// Copyright 2012 Mozilla Corporation. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 9.2.1_8_c_vi
+description: >
+ Tests that canonicalization of locale lists removes duplicate
+ language tags.
+author: Norbert Lindenberg
+includes: [testIntl.js]
+---*/
+
+testWithIntlConstructors(function (Constructor) {
+ var defaultLocale = new Constructor().resolvedOptions().locale;
+ var canonicalized = Constructor.supportedLocalesOf([defaultLocale, defaultLocale]);
+ assert.sameValue(canonicalized.length > 1, false, "Canonicalization didn't remove duplicate language tags from locale list.");
+});
+
+reportCompare(0, 0);