The Tor Browser / file revision

 // # Test Tor Bug #4902: Add DDG and StartPage to Omnibox

 // Check what search engines are installed in the search box.

 function test() {

   // Grab engine IDs.

   let browserSearchService = Components.classes["@mozilla.org/browser/search-service;1"]

                              .getService(Components.interfaces.nsIBrowserSearchService),

       engineIDs = browserSearchService.getEngines().map(e => e.identifier);

   // Check that we have the correct engines installed, in the right order.

   is(engineIDs[0], "startpage", "Default search engine is startpage");

   is(engineIDs[1], "duckduckgo", "Secondary search engine is duckduckgo");

   is(engineIDs[2], "google", "Google is third search engine");

 }