<!DOCTYPE html>
<html class="reftest-wait">
<head>
<title>Bug 1378826 : Removing last video track from recorder stream crashes.</title>
</head>
<body>
<canvas id="canvas"></canvas>
<script type="text/javascript">

function wait(ms) {
  return new Promise(resolve => setTimeout(resolve, ms));
}

function boom() {
  let canvas = document.getElementById("canvas");
  let ctx = canvas.getContext('2d');
  ctx.fillRect(10, 10, 100, 100);
  let stream = canvas.captureStream();
  let rec = new MediaRecorder(stream);
  // At the time of fixing this bug onstop would fire, but this may change in
  // future. As such defensively listen for onerror too to prevent this test
  // timing out.
  let stoppedPromise = new Promise(y => (rec.onstop = y,
                                         rec.onerror = e => y));
  rec.onstart = () => {
    // Remove the video track from the stream we're recording
    stream.removeTrack(stream.getTracks()[0]);
    // Recorder should stop or error in response to the above
    return stoppedPromise
    .then(() => {
      // Little wait to help get bad writes if they're going to happen
      wait(100)
      .then(() => {
        // Didn't crash, finish
        document.documentElement.removeAttribute("class");
      });
    });
  };
  rec.start();
}

window.onload = boom;

</script>
</body>
</html>
