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+<!DOCTYPE HTML>
+<html>
+<head>
+ <title>Test the ability of MediaStream with multiple MediaStreamTracks</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() {
+ try {
+ await setupGetUserMediaTestPrefs();
+ let orgStream = await navigator.mediaDevices.getUserMedia({audio: true, video: true});
+ let a = orgStream.getAudioTracks()[0];
+ let v = orgStream.getVideoTracks()[0];
+ let stream = new MediaStream([a, a, a, a, v, v, v].map(track => track.clone()));
+ let element = document.createElement("video");
+
+ element.onloadedmetadata = function() {
+ is(stream.getAudioTracks().length, 4, 'Length of audio tracks should be 4.');
+ is(stream.getVideoTracks().length, 3, 'Length of vudio tracks should be 3.');
+ SimpleTest.finish();
+ };
+
+ element.srcObject = stream;
+ element.play();
+ } catch (err) {
+ ok(false, 'Unexpected error fired with: ' + err);
+ SimpleTest.finish();
+ }
+}
+
+SimpleTest.waitForExplicitFinish();
+SpecialPowers.pushPrefEnv(
+ {
+ "set": [
+ ["media.track.enabled", true]
+ ]
+ }, startTest);
+
+</script>
+</pre>
+</body>
+</html>