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diff --git a/js/src/tests/test262/intl402/supportedLocalesOf-empty-and-undefined.js b/js/src/tests/test262/intl402/supportedLocalesOf-empty-and-undefined.js
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+++ b/js/src/tests/test262/intl402/supportedLocalesOf-empty-and-undefined.js
@@ -0,0 +1,21 @@
+// Copyright 2012 Mozilla Corporation. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 9.2.1_1
+description: >
+ Tests that canonicalization of locale lists treats undefined and
+ empty lists the same.
+author: Norbert Lindenberg
+includes: [testIntl.js]
+---*/
+
+testWithIntlConstructors(function (Constructor) {
+ var supportedForUndefined = Constructor.supportedLocalesOf(undefined);
+ var supportedForEmptyList = Constructor.supportedLocalesOf([]);
+ assert.sameValue(supportedForUndefined.length, supportedForEmptyList.length, "Supported locales differ between undefined and empty list input.");
+ // we don't compare the elements because length should be 0 - let's just verify that
+ assert.sameValue(supportedForUndefined.length, 0, "Internal test error: Assumption about length being 0 is invalid.");
+});
+
+reportCompare(0, 0);