diff -r 000000000000 -r 6474c204b198 toolkit/components/search/tests/xpcshell/test_init_async_multiple.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/components/search/tests/xpcshell/test_init_async_multiple.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,55 @@
+/* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim:set ts=2 sw=2 sts=2 et: */
+/* 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/. */
+
+/**
+ * Test nsSearchService with with the following initialization scenario:
+ * - launch asynchronous initialization several times;
+ * - all asynchronous initializations must complete.
+ *
+ * Test case comes from test_645970.js
+ */
+function run_test() {
+  do_print("Setting up test");
+
+  do_test_pending();
+  updateAppInfo();
+
+  do_print("Test starting");
+  let numberOfInitializers = 4;
+  let pending = [];
+  let numberPending = numberOfInitializers;
+
+  // Start asynchronous initializations
+  for (let i = 0; i < numberOfInitializers; ++i) {
+    let me = i;
+    pending[me] = true;
+    Services.search.init(function search_initialized_0(aStatus) {
+      do_check_true(Components.isSuccessCode(aStatus));
+      init_complete(me);
+    });
+  }
+
+  // Wait until all initializers have completed
+  let init_complete = function init_complete(i) {
+    do_check_true(pending[i]);
+    pending[i] = false;
+    numberPending--;
+    do_check_true(numberPending >= 0);
+    do_check_true(Services.search.isInitialized);
+    if (numberPending == 0) {
+      // Just check that we can access a list of engines.
+      let engines = Services.search.getEngines();
+      do_check_neq(engines, null);
+
+      // Wait a little before quitting: if some initializer is
+      // triggered twice, we want to catch that error.
+      do_timeout(1000, function() {
+        do_test_finished();
+      });
+    }
+  };
+}
+