chrome/test/data/prerender/prerender_html5_common.js

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 // Common js for the HTML5_* tests. The following variables need to be defined
   6 // before this js is included:
   7 //   - 'willPlay' - indicates if the media is expected to start playing during
   8 //      the test.
   9 //   - 'testNetworkEvents' - if set to true, the test will test for the
  10 //     loadstart and stalled events. NOTE that since the loadstart event fires
  11 //     very early, to test for it reliably, the source of the media tag
  12 //     should be added after this script is included or add
  13 //     'onLoadStart=mediEventHandler' as an attribute to the media element.
  14 //     Also to reliably test the stalled event, the the test should wait for the
  15 //     prerendered page's title to change to "READY" before calling
  16 //     DidPrerenderPass.
  17
  18 function assert(bool) {
  19   if (!bool)
  20     throw new Error('Assert Failed.');
  21 }
  22
  23 var canPlaySeen = false;
  24 var playingSeen = false;
  25 var canPlayThroughSeen = false;
  26 var loadStartSeen = false;
  27 var stalledSeen = false;
  28 var hasError = false;
  29
  30 assert(typeof(willPlay) != 'undefined');
  31 assert(typeof(testNetworkEvents) != 'undefined');
  32
  33 var mediaEl = document.getElementById("mediaEl");
  34
  35 function mediaEventHandler(e) {
  36   switch (e.type) {
  37     case 'canplay':
  38       canPlaySeen = true;
  39       break;
  40     case 'playing':
  41       assert(canPlaySeen);
  42       playingSeen = true;
  43       break;
  44     case 'canplaythrough':
  45       assert(canPlaySeen);
  46       canPlayThroughSeen = true;
  47       break;
  48     case 'error':
  49       hasError = true;
  50       break;
  51     case 'loadstart':
  52       loadStartSeen = true;
  53       break;
  54     case 'stalled':
  55       assert(loadStartSeen);
  56       stalledSeen = true;
  57       if (testNetworkEvents) {
  58         document.title = 'READY';
  59       }
  60       break;
  61   }
  62
  63   var progressDone = (willPlay && canPlayThroughSeen && playingSeen) ||
  64       (!willPlay && canPlayThroughSeen && !playingSeen);
  65
  66   if (progressDone)
  67     document.title = 'PASS';
  68 }
  69
  70 mediaEl.addEventListener('playing', mediaEventHandler, false);
  71 mediaEl.addEventListener('canplay', mediaEventHandler, false);
  72 mediaEl.addEventListener('canplaythrough', mediaEventHandler, false);
  73 mediaEl.addEventListener('error', mediaEventHandler, false);
  74
  75 if (testNetworkEvents) {
  76   mediaEl.addEventListener('stalled', mediaEventHandler, false);
  77   mediaEl.addEventListener('loadstart', mediaEventHandler, false);
  78 }
  79
  80 // TODO(shishir): Remove this once http://crbug.com/130788 is fixed.
  81 function printDebugInfo() {
  82   console.log("\ncanPlaySeen: " + canPlaySeen);
  83   console.log("playingSeen: " + playingSeen);
  84   console.log("canPlayThroughSeen: " + canPlayThroughSeen);
  85   console.log("loadStartSeen: " + loadStartSeen);
  86   console.log("stalledSeen: " + stalledSeen);
  87   console.log("hasError: " + hasError + "\n");
  88 }
  89 setInterval(printDebugInfo, 5000);
  90
  91 function DidPrerenderPass() {
  92   // The media should not have started at this point.
  93   return !canPlaySeen && !playingSeen && !hasError &&
  94       mediaEl.currentTime == 0 &&
  95       mediaEl.readyState == mediaEl.HAVE_NOTHING &&
  96       (!testNetworkEvents || stalledSeen);
  97 }
  98
  99 function DidDisplayPass() {
 100   // The actual test is done via the TitleWatcher.
 101   return true;
 102 }