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);

   enableThenDisable();

 }

 function enableThenDisable() {

   log("Enable FM Radio and disable it immediately.");

   var frequency = FMRadio.frequencyLowerBound + FMRadio.channelWidth;

   var request = FMRadio.enable(frequency);

   ok(request);

   var failedToEnable = false;

   request.onerror = function() {

     failedToEnable = true;

   };

   var enableCompleted = false;

   request.onsuccess = function() {

     ok(!failedToEnable);

     enableCompleted = true;

   };

   var disableReq = FMRadio.disable();

   ok(disableReq);

   disableReq.onsuccess = function() {

     // There are two possibilities which depends on the system

     // process scheduling (bug 911063 comment 0):

     //   - enable fails

     //   - enable's onsuccess fires before disable's onsucess

     ok(failedToEnable || enableCompleted);

     ok(!FMRadio.enabled);

     finish();

   };

   disableReq.onerror = function() {

     ok(false, "Disable request should not fail.");

   };

 }

 verifyInitialState();