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() {

   var request = FMRadio.seekUp();

   ok(request);

   // There are two possibilities which depends on the system

   // process scheduling (bug 911063 comment 0):

   //   - the second seek fails

   //   - both seeks are executed

   request.onerror = function() {

     ok(!firstSeekCompletes);

     cleanUp();

   };

   var firstSeekCompletes = false;

   request.onsuccess = function() {

     firstSeekCompletes = true;

   };

   var seekAgainReq = FMRadio.seekUp();

   ok(seekAgainReq);

   seekAgainReq.onerror = function() {

     log("Cancel the first seek to finish the test");

     let cancelReq = FMRadio.cancelSeek();

     ok(cancelReq);

     // It's possible that the first seek completes when the

     // cancel request is handled.

     cancelReq.onerror = function() {

       cleanUp();

     };

   };

   seekAgainReq.onsuccess = function() {

     ok(firstSeekCompletes);

     cleanUp();

   };

 }

 function cleanUp() {

   FMRadio.disable();

   FMRadio.ondisabled = function() {

     FMRadio.ondisabled = null;

     ok(!FMRadio.enabled);

     finish();

   };

 }

 verifyInitialState();