diff -r 000000000000 -r 6474c204b198 widget/tests/unit/test_macwebapputils.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/widget/tests/unit/test_macwebapputils.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,44 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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/. */
+
+//Basic tests to verify that MacWebAppUtils works
+
+let Ci = Components.interfaces;
+let Cc = Components.classes;
+let Cu = Components.utils;
+let Cr = Components.results;
+
+Cu.import("resource://gre/modules/Services.jsm");
+Cu.import("resource://gre/modules/XPCOMUtils.jsm");
+
+function test_find_app()
+{
+  var mwaUtils = Cc["@mozilla.org/widget/mac-web-app-utils;1"].
+  createInstance(Ci.nsIMacWebAppUtils);
+  let sig = "com.apple.TextEdit";
+
+  let path;
+  path = mwaUtils.pathForAppWithIdentifier(sig);
+  do_print("TextEdit path: " + path + "\n");
+  do_check_neq(path, "");
+}
+
+function test_dont_find_fake_app()
+{
+  var mwaUtils = Cc["@mozilla.org/widget/mac-web-app-utils;1"].
+  createInstance(Ci.nsIMacWebAppUtils);
+  let sig = "calliope.penitentiary.dramamine";
+
+  let path;
+  path = mwaUtils.pathForAppWithIdentifier(sig);
+  do_check_eq(path, "");
+}
+
+
+function run_test()
+{
+  test_find_app();
+  test_dont_find_fake_app();
+}