1 files changed, 19 insertions, 0 deletions
diff --git a/js/src/tests/test262/intl402/supportedLocalesOf-duplicate-elements-removed.js b/js/src/tests/test262/intl402/supportedLocalesOf-duplicate-elements-removed.js
new file mode 100644
index 0000000000..6b8d818d13
--- /dev/null
+++ b/js/src/tests/test262/intl402/supportedLocalesOf-duplicate-elements-removed.js
@@ -0,0 +1,19 @@
+// 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);