diff -r 000000000000 -r 6474c204b198 js/src/tests/Intl/NumberFormat/format.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/Intl/NumberFormat/format.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,47 @@
+// |reftest| skip-if(!this.hasOwnProperty("Intl"))
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+// Tests the format function with a diverse set of locales and options.
+
+var format;
+
+// Locale en-US; default options.
+format = new Intl.NumberFormat("en-us");
+assertEq(format.format(0), "0");
+assertEq(format.format(-1), "-1");
+assertEq(format.format(123456789.123456789), "123,456,789.123");
+
+// Locale en-US; currency USD.
+// The US dollar uses two fractional digits, and negative values are commonly
+// parenthesized.
+format = new Intl.NumberFormat("en-us", {style: "currency", currency: "USD"});
+assertEq(format.format(0), "$0.00");
+assertEq(format.format(-1), "-$1.00");
+assertEq(format.format(123456789.123456789), "$123,456,789.12");
+
+// Locale ja-JP; currency JPY.
+// The Japanese yen has no subunit in real life.
+format = new Intl.NumberFormat("ja-jp", {style: "currency", currency: "JPY"});
+assertEq(format.format(0), "￥0");
+assertEq(format.format(-1), "-￥1");
+assertEq(format.format(123456789.123456789), "￥123,456,789");
+
+// Locale ar-JO; currency JOD.
+// The Jordanian Dinar divides into 1000 fils. Jordan uses (real) Arabic digits.
+format = new Intl.NumberFormat("ar-jo", {style: "currency", currency: "JOD"});
+assertEq(format.format(0), "د.أ.‏ ٠٫٠٠٠");
+assertEq(format.format(-1), "‏-د.أ.‏ ١٫٠٠٠");
+assertEq(format.format(123456789.123456789), "د.أ.‏ ١٢٣٬٤٥٦٬٧٨٩٫١٢٣");
+
+// Locale th-TH; Thai digits, percent, two significant digits.
+format = new Intl.NumberFormat("th-th-u-nu-thai",
+                               {style: "percent",
+                                minimumSignificantDigits: 2,
+                                maximumSignificantDigits: 2});
+assertEq(format.format(0), "๐.๐%");
+assertEq(format.format(-0.01), "-๑.๐%");
+assertEq(format.format(1.10), "๑๑๐%");
+
+reportCompare(0, 0, 'ok');