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+<!doctype html>
+<html>
+<head>
+<title>Adding a track to a MediaStream</title>
+<link rel="author" title="Dominique Hazael-Massieux" href="mailto:dom@w3.org"/>
+<link rel="help" href="http://dev.w3.org/2011/webrtc/editor/getusermedia.html#widl-MediaStreamTrackList-add-void-MediaStreamTrack-track">
+<link rel="help" href="http://dev.w3.org/2011/webrtc/editor/getusermedia.html#event-mediastream-addtrack">
+</head>
+<body>
+<p class="instructions">When prompted, accept to share your audio stream, then your video stream.</p>
+<h1 class="instructions">Description</h1>
+<p class="instructions">This test checks that adding a track to a MediaStream works as expected.</p>
+
+<div id='log'></div>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src="/common/vendor-prefix.js" data-prefixed-objects='[{"ancestors":["navigator"], "name":"getUserMedia"}]'></script>
+<script>
+var t = async_test("Tests that adding a track to a MediaStream works as expected", {timeout: 20000}); // longer timeout since requires double user interaction
+t.step(function () {
+  var audio, video;
+
+  navigator.getUserMedia({audio: true}, gotAudio, function(error) {});
+  function gotAudio(stream) {
+    audio = stream;
+    navigator.getUserMedia({video: true}, gotVideo, function(error) {});
+  }
+
+  function gotVideo(stream) {
+    video = stream;
+    t.step(function () {
+       assert_equals(video.getAudioTracks().length, 0, "video mediastream starts with no audio track");
+       video.addTrack(audio.getAudioTracks()[0]);
+       assert_equals(video.getAudioTracks().length, 1, "video mediastream has now one audio track");
+       video.addTrack(audio.getAudioTracks()[0]);
+       assert_equals(video.getAudioTracks().length, 1, "video mediastream still has one audio track"); // If track is already in stream's track set, then abort these steps.
+
+    });
+    audio.onaddtrack = t.step_func(function () {
+       assert_unreached("onaddtrack is not fired when the script directly modified the track of a mediastream");
+    });
+    t.step(function () {
+       assert_equals(audio.getVideoTracks().length, 0, "audio mediastream starts with no video track");
+       audio.addTrack(video.getVideoTracks()[0]);
+       assert_equals(audio.getVideoTracks().length, 1, "audio mediastream now has one video track");
+    });
+    t.step(function () {
+       t.done();
+    });
+  }
+});
+</script>
+</body>
+</html>