diff -r 000000000000 -r 6474c204b198 js/src/tests/test262/intl402/ch11/11.1/11.1.2.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/test262/intl402/ch11/11.1/11.1.2.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,30 @@
+// Copyright 2011-2012 Norbert Lindenberg. All rights reserved.
+// Copyright 2012 Mozilla Corporation. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/**
+ * @description Tests that Intl.NumberFormat can be subclassed.
+ * @author Norbert Lindenberg
+ */
+
+$INCLUDE("testIntl.js");
+
+// get a number format and have it format an array of numbers for comparison with the subclass
+var locales = ["tlh", "id", "en"];
+var a = [0, 1, -1, -123456.789, -Infinity, NaN];
+var referenceNumberFormat = new Intl.NumberFormat(locales);
+var referenceFormatted = a.map(referenceNumberFormat.format);
+
+function MyNumberFormat(locales, options) {
+    Intl.NumberFormat.call(this, locales, options);
+    // could initialize MyNumberFormat properties
+}
+
+MyNumberFormat.prototype = Object.create(Intl.NumberFormat.prototype);
+MyNumberFormat.prototype.constructor = MyNumberFormat;
+// could add methods to MyNumberFormat.prototype
+
+var format = new MyNumberFormat(locales);
+var actual = a.map(format.format);
+testArraysAreSame(referenceFormatted, actual);
+