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diff --git a/dom/media/tests/mochitest/test_getUserMedia_bug1223696.html b/dom/media/tests/mochitest/test_getUserMedia_bug1223696.html
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+<!DOCTYPE HTML>
+<html>
+<head>
+ <script type="application/javascript" src="mediaStreamPlayback.js"></script>
+ <script type="application/javascript" src="/tests/dom/canvas/test/captureStream_common.js"></script>
+</head>
+<body>
+<pre id="test">
+<script type="application/javascript">
+ "use strict";
+
+ createHTML({
+ title: "Testing that removeTrack+addTrack of video tracks still render the correct track in a media element",
+ bug: "1223696",
+ visible: true
+ });
+
+ runTest(() => Promise.resolve()
+ .then(() => getUserMedia({audio:true, video: true})).then(stream => {
+ info("Test addTrack()ing a video track to an audio-only gUM stream");
+
+ var video = createMediaElement("video", "test_video_track");
+ video.srcObject = stream;
+ video.play();
+
+ var h = new CaptureStreamTestHelper2D();
+ var removedTrack = stream.getVideoTracks()[0];
+ stream.removeTrack(removedTrack);
+ video.onloadeddata = () => {
+ info("loadeddata");
+ var canvas = document.createElement("canvas");
+ canvas.getContext("2d");
+ var canvasStream = canvas.captureStream();
+ setInterval(() => h.drawColor(canvas, h.grey), 1000);
+
+ stream.addTrack(canvasStream.getVideoTracks()[0]);
+
+ checkMediaStreamContains(stream, [stream.getAudioTracks()[0],
+ canvasStream.getVideoTracks()[0]]);
+ };
+
+ return listenUntil(video, "loadeddata", () => true)
+ .then(() => h.waitForPixelColor(video, h.grey, 5,
+ "The canvas track should be rendered by the media element"))
+ .then(() => {
+ [removedTrack, ...stream.getAudioTracks()].forEach(t => t.stop());
+ });
+ }));
+</script>
+</pre>
+</body>
+</html>