The Tor Browser / file revision

 /* 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/. */

 function run_test() {   

   do_load_manifest("component-file.manifest");

   const contractID = "@mozilla.org/tests/component-file;1";

   do_check_true(contractID in Components.classes);

   var foo = Components.classes[contractID]

                       .createInstance(Components.interfaces.nsIClassInfo);

   do_check_true(Boolean(foo));

   do_check_true(foo.contractID == contractID);

   do_check_true(!!foo.wrappedJSObject);

   do_check_true(foo.wrappedJSObject.doTest());

 }