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diff --git a/dom/media/tests/mochitest/test_getUserMedia_audioCapture.html b/dom/media/tests/mochitest/test_getUserMedia_audioCapture.html
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+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Test AudioCapture </title>
+  <script type="application/javascript" src="mediaStreamPlayback.js"></script>
+</head>
+<body>
+<pre id="test">
+<script>
+
+createHTML({
+  bug: "1156472",
+  title: "Test AudioCapture with regular HTMLMediaElement, AudioContext, and HTMLMediaElement playing a MediaStream",
+  visible: true
+});
+
+scriptsReady
+.then(() => FAKE_ENABLED = false)
+.then(() => {
+  runTestWhenReady(function() {
+    // Get an opus file containing a sine wave at maximum amplitude, of duration
+    // `lengthSeconds`, and of frequency `frequency`.
+    function getSineWaveFile(frequency, lengthSeconds, callback) {
+      var chunks = [];
+      var off = new OfflineAudioContext(1, lengthSeconds * 48000, 48000);
+      var osc = off.createOscillator();
+      var rec = new MediaRecorder(osc);
+      rec.ondataavailable = function(e) {
+        chunks.push(e.data);
+      };
+      rec.onstop = function(e) {
+        var blob = new Blob(chunks, { 'type' : 'audio/ogg; codecs=opus' });
+        callback(blob);
+      }
+      osc.frequency.value = frequency;
+      osc.start();
+      rec.start();
+      off.startRendering().then(function(buffer) {
+        rec.stop();
+      });
+    }
+    /**
+     * Get two HTMLMediaElements:
+     * - One playing a sine tone from a blob (of an opus file created on the fly)
+     * - One being the output for an AudioContext's OscillatorNode, connected to
+     *   a MediaSourceDestinationNode.
+     *
+     * Also, use the AudioContext playing through its AudioDestinationNode another
+     * tone, using another OscillatorNode.
+     *
+     * Capture the output of the document, feed that back into the AudioContext,
+     * with an AnalyserNode, and check the frequency content to make sure we
+     * have recorded the three sources.
+     *
+     * The three sine tones have frequencies far apart from each other, so that we
+     * can check that the spectrum of the capture stream contains three
+     * components with a high magnitude.
+     */
+    var wavtone = createMediaElement("audio", "WaveTone");
+    var acTone = createMediaElement("audio", "audioContextTone");
+    var ac = new AudioContext();
+
+    var oscThroughMediaElement = ac.createOscillator();
+    oscThroughMediaElement.frequency.value = 1000;
+    var oscThroughAudioDestinationNode = ac.createOscillator();
+    oscThroughAudioDestinationNode.frequency.value = 5000;
+    var msDest = ac.createMediaStreamDestination();
+
+    oscThroughMediaElement.connect(msDest);
+    oscThroughAudioDestinationNode.connect(ac.destination);
+
+    acTone.mozSrcObject = msDest.stream;
+
+    getSineWaveFile(10000, 10, function(blob) {
+      wavtone.src = URL.createObjectURL(blob);
+      oscThroughMediaElement.start();
+      oscThroughAudioDestinationNode.start();
+      wavtone.loop = true;
+      wavtone.play();
+      acTone.play();
+    });
+
+    var constraints = {audio: {mediaSource: "audioCapture"}};
+
+    return getUserMedia(constraints).then((stream) => {
+      window.grip = stream;
+      var analyser = new AudioStreamAnalyser(ac, stream);
+      analyser.enableDebugCanvas();
+      return analyser.waitForAnalysisSuccess(function(array) {
+        // We want to find three frequency components here, around 1000, 5000
+        // and 10000Hz. Frequency are logarithmic. Also make sure we have low
+        // energy in between, not just a flat white noise.
+        return (array[analyser.binIndexForFrequency(50)]    < 50 &&
+                array[analyser.binIndexForFrequency(1000)]  > 200 &&
+                array[analyser.binIndexForFrequency(2500)]  < 50 &&
+                array[analyser.binIndexForFrequency(5000)]  > 200 &&
+                array[analyser.binIndexForFrequency(7500)]  < 50 &&
+                array[analyser.binIndexForFrequency(10000)] > 200);
+      }).then(finish);
+    }).catch(finish);
+  });
+});
+
+
+
+</script>
+</pre>
+</body>
+</html>