The Tor Browser / file revision

 /* Any copyright is dedicated to the Public Domain.

  * http://creativecommons.org/publicdomain/zero/1.0/ */

 MARIONETTE_TIMEOUT = 10000;

 SpecialPowers.addPermission("fmradio", true, document);

 let FMRadio = window.navigator.mozFMRadio;

 function verifyInitialState() {

   log("Verifying initial state.");

   ok(FMRadio);

   is(FMRadio.enabled, false);

   setUp();

 }

 function setUp() {

   let frequency = FMRadio.frequencyLowerBound + FMRadio.channelWidth;

   FMRadio.enable(frequency);

   FMRadio.onenabled = seek;

 }

 function seek() {

   log("Seek up");

   var request = FMRadio.seekUp();

   ok(request);

   var seekUpIsCancelled = false;

   request.onerror = function() {

     seekUpIsCancelled = true;

   };

   var seekUpCompleted = false;

   request.onsuccess = function() {

     ok(!seekUpIsCancelled);

     seekUpCompleted = true;

   };

   log("Seek up");

   var cancelSeekReq = FMRadio.cancelSeek();

   ok(cancelSeekReq);

   // There are two possibilities which depends on the system

   // process scheduling (bug 911063 comment 0):

   //   - seekup action is canceled

   //   - seekup's onsuccess fires before cancelSeek's onerror

   cancelSeekReq.onsuccess = function() {

     ok(seekUpIsCancelled, "Seekup request failed.");

     cleanUp();

   };

   cancelSeekReq.onerror = function() {

     ok(seekUpCompleted);

     cleanUp();

   };

 }

 function cleanUp() {

   FMRadio.disable();

   FMRadio.ondisabled = function() {

     FMRadio.ondisabled = null;

     ok(!FMRadio.enabled);

     finish();

   };

 }

 verifyInitialState();