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diff --git a/test/suite/intl402/ch09/9.2/9.2.8_4.js b/test/suite/intl402/ch09/9.2/9.2.8_4.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.
+
+/**
+ * @description Tests that the array returned by SupportedLocales is extensible,
+ *     but its properties are non-writable/non-configurable.
+ * @author Norbert Lindenberg
+ */
+
+$INCLUDE("testIntl.js");
+
+function testFrozenProperty(obj, property) {
+    var desc = Object.getOwnPropertyDescriptor(obj, property);
+    if (desc.writable) {
+        $ERROR("Property " + property + " of object returned by SupportedLocales is writable.");
+    }
+    if (desc.configurable) {
+        $ERROR("Property " + property + " of object returned by SupportedLocales is configurable.");
+    }
+}
+
+testWithIntlConstructors(function (Constructor) {
+    var defaultLocale = new Constructor().resolvedOptions().locale;
+    var supported = Constructor.supportedLocalesOf([defaultLocale]);
+    if (!Object.isExtensible(supported)) {
+        $ERROR("Object returned by SupportedLocales is not extensible.");
+    }
+    for (var i = 0; i < supported.length; i++) {
+        testFrozenProperty(supported, i);
+    }
+    testFrozenProperty(supported, "length");
+
+    return true;
+});
+