diff -r 000000000000 -r 6474c204b198 intl/locale/tests/unit/test_pluralForm_english.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/intl/locale/tests/unit/test_pluralForm_english.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,26 @@
+/* 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/. */
+
+/**
+ * This unit test makes sure the plural form for the default language (by
+ * development), English, is working for the PluralForm javascript module.
+ */
+
+Components.utils.import("resource://gre/modules/PluralForm.jsm");
+
+function run_test()
+{
+  // English has 2 plural forms
+  do_check_eq(2, PluralForm.numForms());
+
+  // Make sure for good inputs, things work as expected
+  for (var num = 0; num <= 200; num++)
+    do_check_eq(num == 1 ? "word" : "words", PluralForm.get(num, "word;words"));
+
+  // Not having enough plural forms defaults to the first form
+  do_check_eq("word", PluralForm.get(2, "word"));
+
+  // Empty forms defaults to the first form
+  do_check_eq("word", PluralForm.get(2, "word;"));
+}