Bug 1276530 - Fix test_texttrackevents_video.html. r=rillian

MozReview-Commit-ID: Gn11D3I0MRb

--HG--
extra : transplant_source : %B0%83%11%19m%870%98%90%14%2A%82%D3f%B0%C1%8A%B5Cw

dom/media/test/test_texttrackevents_video.html

@@ -29,6 +29,8 @@ SpecialPowers.pushPrefEnv({"set": [["media.webvtt.enabled", true]]},
 
     var trackElementCueChangeCount = 0;
     var trackCueChangeCount = 0;
+    var cueEnterCount = 0;
+    var cueExitCount = 0;
 
     video.addEventListener("loadedmetadata", function run_tests() {
       // Re-queue run_tests() at the end of the event loop until the track
@@ -39,6 +41,27 @@ SpecialPowers.pushPrefEnv({"set": [["media.webvtt.enabled", true]]},
       is(trackElement.readyState, 2, "Track::ReadyState should be set to LOADED.");
       ok('oncuechange' in trackElement.track, "Track::OnCueChange should exist.");
 
+      var textTrack = trackElement.track;
+      is(textTrack.cues.length, 3, "textTrack.cues.length should 3.");
+      textTrack.cues[0].onenter = function() {
+        ++cueEnterCount;
+      };
+      textTrack.cues[0].onexit = function() {
+        ++cueExitCount;
+      };
+      textTrack.cues[1].onenter = function() {
+        ++cueEnterCount;
+      };
+      textTrack.cues[1].onexit = function() {
+        ++cueExitCount;
+      };
+      textTrack.cues[2].onenter = function() {
+        ++cueEnterCount;
+      };
+      textTrack.cues[2].onexit = function() {
+        ++cueExitCount;
+      };
+
       trackElement.track.oncuechange = function() {
         ++trackElementCueChangeCount;
       };
@@ -51,10 +74,15 @@ SpecialPowers.pushPrefEnv({"set": [["media.webvtt.enabled", true]]},
     });
 
     video.addEventListener('ended', function() {
-      // Should be fired 6 times, as there are 3 cues, with a change event
-      // for when it is activated/deactivated (6 events total)
-      is(trackElementCueChangeCount, 6, "TrackElement should fire cue change 6 times.");
-      is(trackCueChangeCount, 6, "TrackElement.track should fire cue change 6 times.");
+      // Should be fired 1 to 6 times, as there are 3 cues,
+      // with a change event for when it is activated/deactivated
+      // (6 events at most).
+      isnot(trackElementCueChangeCount, 0, "TrackElement should fire cue change at least one time.");
+      ok(trackElementCueChangeCount <= 6, 'trackElementCueChangeCount should <= 6');
+      isnot(trackCueChangeCount, 0, "TrackElement.track should fire cue change at least one time.");
+      ok(trackCueChangeCount <= 6, 'trackCueChangeCount should <= 6');
+      is(cueEnterCount, 3, "cueEnterCount should fire three times.");
+      is(cueExitCount, 3, "cueExitCount should fire three times.");
       SimpleTest.finish()
     })
   }