diff -r 000000000000 -r 6474c204b198 toolkit/components/search/tests/xpcshell/test_sync.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/components/search/tests/xpcshell/test_sync.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,29 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+function run_test() {
+  removeMetadata();
+  removeCacheFile();
+
+  do_load_manifest("data/chrome.manifest");
+
+  let url  = "chrome://testsearchplugin/locale/searchplugins/";
+  Services.prefs.setCharPref("browser.search.jarURIs", url);
+  Services.prefs.setBoolPref("browser.search.loadFromJars", true);
+
+  do_check_false(Services.search.isInitialized);
+
+  // test engines from dir are loaded.
+  let engines = Services.search.getEngines();
+  do_check_true(engines.length > 1);
+
+  do_check_true(Services.search.isInitialized);
+
+  // test jar engine is loaded ok.
+  let engine = Services.search.getEngineByName("bug645970");
+  do_check_neq(engine, null);
+
+  Services.prefs.clearUserPref("browser.search.jarURIs");
+  Services.prefs.clearUserPref("browser.search.loadFromJars");
+}
+