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  <title>Bug 1395022 - MediaRecorder fires start event when erroring.</title>
  <script src="/tests/SimpleTest/SimpleTest.js"></script>
  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
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<body>
<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1395022">Mozilla Bug 1395022</a>
<pre id="test">
<script class="testbody" type="text/javascript">
function startTest() {
  let audioContext = new AudioContext();
  let destination1 = audioContext.createMediaStreamDestination();
  let oscilator = audioContext.createOscillator();
  oscilator.connect(destination1);
  oscilator.start();

  let destination2 = audioContext.createMediaStreamDestination();

  let rec = new MediaRecorder(destination1.stream);

  let numStartEvents = 0;

  rec.onstart = () => {
    numStartEvents += 1;
    is(numStartEvents, 1, "One start event should be fired by the recorder");
    // Trigger an error in the recorder
    destination1.stream.addTrack(destination2.stream.getTracks()[0]);
  };

  rec.onerror = () => {
    is(numStartEvents, 1, "One start event should have been fired by the recorder");
    SimpleTest.finish();
  };

  rec.start();
}

SimpleTest.waitForExplicitFinish();
startTest();

</script>
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