--- a/dom/media/tests/mochitest/test_getUserMedia_mediaStreamTrackClone.html
+++ b/dom/media/tests/mochitest/test_getUserMedia_mediaStreamTrackClone.html
@@ -47,17 +47,20 @@
       var cloneStream = new MediaStream();
       cloneStream.addTrack(inceptionClone);
 
       // cloneStream is now essentially the same as stream.clone();
       checkMediaStreamCloneAgainstOriginal(cloneStream, stream);
 
       var test = createMediaElement('video', 'testClonePlayback');
       var playback = new MediaStreamPlayback(test, cloneStream);
-      return playback.playMediaWithMediaStreamTracksStop(false);
+      return playback.playMediaWithMediaStreamTracksStop(false)
+        .then(() => info("Testing that clones of ended tracks are ended"))
+        .then(() => cloneStream.clone().getTracks().forEach(t =>
+          is(t.readyState, "ended", "Track " + t.id + " should be ended")));
     })
     .then(() => getUserMedia({audio: true, video: true})).then(stream => {
       info("Test adding many track clones to the original stream");
 
       const LOOPS = 3;
       for (var i = 0; i < LOOPS; i++) {
         stream.getTracks().forEach(t => stream.addTrack(t.clone()));
       }