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+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Test track interfaces when consuming a MediaStream from gUM</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+  <script type="text/javascript" src="manifest.js"></script>
+  <script type="text/javascript" src="gUM_support.js"></script>
+</head>
+<body>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+async function startTest() {
+  let steps = 0;
+  let audioOnchange = 0;
+  let audioOnaddtrack = 0;
+  let videoOnchange = 0;
+  let videoOnaddtrack = 0;
+  let isPlaying = false;
+  let element = document.createElement("video");
+  let stream;
+  try {
+    await setupGetUserMediaTestPrefs();
+    stream = await navigator.mediaDevices.getUserMedia({audio: true, video: true});
+  } catch (err) {
+    ok(false, 'Unexpected error fired with: ' + err);
+    SimpleTest.finish();
+    return;
+  }
+
+  element.audioTracks.onaddtrack = function(e) {
+    audioOnaddtrack++;
+  };
+
+  element.audioTracks.onchange = function(e) {
+    audioOnchange++;
+  };
+
+  element.videoTracks.onaddtrack = function(e) {
+    videoOnaddtrack++;
+  };
+
+  element.videoTracks.onchange = function(e) {
+    videoOnchange++;
+  };
+
+  function checkTrackRemoved() {
+    if (isPlaying) {
+      is(element.audioTracks.length, 0, 'The length of audioTracks should be 0.');
+      is(element.videoTracks.length, 0, 'The length of videoTracks should be 0.');
+    }
+  }
+
+  element.onended = function() {
+    ok(true, 'Event ended is expected to be fired on element.');
+    checkTrackRemoved();
+    element.onended = null;
+    element.onplaying = null;
+    element.onpause = null;
+    SimpleTest.finish();
+  }
+
+  function checkTrackAdded() {
+    isPlaying = true;
+    is(audioOnaddtrack, 1, 'Calls of onaddtrack on audioTracks should be 1.');
+    is(element.audioTracks.length, 1, 'The length of audioTracks should be 1.');
+    ok(element.audioTracks[0].enabled, 'Audio track should be enabled as default.');
+    is(videoOnaddtrack, 1, 'Calls of onaddtrack on videoTracks should be 1.');
+    is(element.videoTracks.length, 1, 'The length of videoTracks should be 1.');
+    is(element.videoTracks.selectedIndex, 0,
+        'The first video track is set selected as default.');
+  }
+
+  function setTrackEnabled(enabled) {
+    element.audioTracks[0].enabled = enabled;
+    element.videoTracks[0].selected = enabled;
+  }
+
+  function checkTrackChanged(calls, enabled) {
+    is(audioOnchange, calls, 'Calls of onchange on audioTracks should be '+calls);
+    is(element.audioTracks[0].enabled, enabled,
+        'Enabled value of the audio track should be ' +enabled);
+    is(videoOnchange, calls, 'Calls of onchange on videoTracks should be '+calls);
+    is(element.videoTracks[0].selected, enabled,
+        'Selected value of the video track should be ' +enabled);
+    var index = enabled ? 0 : -1;
+    is(element.videoTracks.selectedIndex, index,
+        'SelectedIndex of video tracks should be ' +index);
+  }
+
+  function onpause() {
+    element.onpause = null;
+    if (element.ended) {
+      return;
+    }
+    if (steps == 1) {
+      setTrackEnabled(false);
+      element.onplaying = onplaying;
+      element.play();
+      steps++;
+    } else if (steps == 2) {
+      setTrackEnabled(true);
+      element.onplaying = onplaying;
+      element.play();
+      steps++;
+    }
+  }
+
+  function onplaying() {
+    element.onplaying = null;
+    if (element.ended) {
+      return;
+    }
+    if (steps == 1) {
+      element.onpause = onpause;
+      element.pause();
+      checkTrackAdded();
+    } else if (steps == 2) {
+      element.onpause = onpause;
+      element.pause();
+      checkTrackChanged(1, false);
+    } else if (steps == 3) {
+      checkTrackChanged(2, true);
+      stream.getTracks().forEach(t => t.stop());
+    }
+  }
+
+  element.onplaying = onplaying;
+  element.srcObject = stream;
+
+  steps++;
+  await element.play();
+}
+
+SimpleTest.waitForExplicitFinish();
+SpecialPowers.pushPrefEnv(
+  {
+    "set": [
+      ["media.track.enabled", true]
+    ]
+  }, startTest);
+
+</script>
+</pre>
+</body>
+</html>