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 var frameLoadsPending = 2;

 var callMasterFrame = true;

 var testDone = false;

 var masterFrameOrigin = "";

 var slaveFrameOrigin = "";

 var failureRegExp = new RegExp("^FAILURE");

 var todoRegExp = new RegExp("^TODO");

 const framePath = "/tests/dom/tests/mochitest/storageevent/";

 window.addEventListener("message", onMessageReceived, false);

 function onMessageReceived(event)

 {

   switch (event.data)

   {

     // Indication of the frame onload event

     case "frame loaded":

       if (--frameLoadsPending)

         break;

       // Just fall through...

     // Indication of successfully finished step of a test

     case "perf":

       if (callMasterFrame)

         masterFrame.postMessage("step", "*");

       else if (slaveFrame)

         slaveFrame.postMessage("step", "*");

       else if (SpecialPowers.wrap(masterFrame).slaveFrame)

         SpecialPowers.wrap(masterFrame).slaveFrame.postMessage("step", "*");

       callMasterFrame = !callMasterFrame;

       break;

     // Indication of all test parts finish (from any of the frames)

     case "done":

       if (testDone)

         break;

       testDone = true;

       SimpleTest.finish();

       break;

     // Any other message indicates error, succes or todo message of a test

     default:

       if (typeof event.data == "undefined")

         break; // XXXkhuey this receives undefined values

                // (which used to become empty strings) on occasion ...

       if (event.data.match(todoRegExp))

         SimpleTest.todo(false, event.data);

       else

         SimpleTest.ok(!event.data.match(failureRegExp), event.data);

       break;

   }

 }