dom/media/webvtt/test/mochitest/test_texttrack_moz.html

   1 <!DOCTYPE HTML>
   2 <html>
   3 <head>
   4   <title>Test for Bug 881976 - TextTrackList</title>
   5   <script src="/tests/SimpleTest/SimpleTest.js"></script>
   6   <script type="text/javascript" src="manifest.js"></script>
   7   <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
   8 </head>
   9 <body>
  10 <video id="v" src="seek.webm" preload="metadata">
  11 <script type="text/javascript">
  12 /**
  13  * This test is used to ensure the text track list we got from video is as same
  14  * as the one in the text track.
  15  */
  16 var video = document.getElementById("v");
  17
  18 async function runTest() {
  19   addTrackViaAddTrackAPI();
  20   await addTrackViaTrackElement();
  21   SimpleTest.finish();
  22 }
  23
  24 SimpleTest.waitForExplicitFinish();
  25 onload = runTest;
  26
  27 /**
  28  * The following are test helper functions.
  29  */
  30 function addTrackViaAddTrackAPI() {
  31   // Check if adding a text track manually sets the TextTrackList correctly.
  32   video.addTextTrack("subtitles", "", "");
  33   // TextTrack.textTrackList is an extension available only to privileged code,
  34   // so we need to access it through the SpecialPowers object.
  35   is(SpecialPowers.unwrap(SpecialPowers.wrap(video.textTracks[0]).textTrackList),
  36      video.textTracks,
  37      "The Track's TextTrackList should be the Video's TextTrackList.");
  38 }
  39
  40 async function addTrackViaTrackElement() {
  41   // Check if loading a Track via a TrackElement sets the TextTrackList correctly.
  42   let trackElement = document.createElement("track");
  43   trackElement.src = "basic.vtt";
  44   trackElement.kind = "subtitles";
  45   trackElement.default = true;
  46   video.appendChild(trackElement);
  47
  48   info(`wait until the track finishes loading`);
  49   await once(trackElement, "load");
  50
  51   is(trackElement.readyState, HTMLTrackElement.LOADED,
  52      "Track::ReadyState should be set to LOADED.");
  53   is(SpecialPowers.unwrap(SpecialPowers.wrap(trackElement.track).textTrackList),
  54      video.textTracks,
  55      "TrackElement's Track's TextTrackList should be the Video's TextTrackList.");
  56 }
  57
  58 </script>
  59 </body>
  60 </html>