author Kagami Sascha Rosylight <>
Sat, 12 Jun 2021 11:04:51 +0000
changeset 582907 dfe6447f4f8a033dd471d920a0665fd9645bdf3c
parent 496302 85af0c8641abb9516e88c3e72244f98da7465c3f
permissions -rw-r--r--
Bug 1715819 - Select the text node if exists in TextEditor::SelectEntireDocument r=masayuki Differential Revision:

  <title>Test MediaRecorder Immediate Stop</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>
<pre id="test">
<script class="testbody" type="text/javascript">
var manager = new MediaTestManager;

 * Stops the media recorder immediately after starting the recorder. This test
 * verifies whether the media recorder can handle this scenario nicely. The
 * return blob size should be greater than zero, but its duration would be zero
 * length when play.
function startTest(test, token) {
  var element = document.createElement('audio');
  var expectedMimeType = test.type;

  element.token = token;

  element.src =;
  element.test = test; = element.mozCaptureStreamUntilEnded();

  var mediaRecorder =
    new MediaRecorder(, {mimeType: expectedMimeType});
  var onStopFired = false;
  var onDataAvailableFired = false;

  mediaRecorder.onerror = function () {
    ok(false, 'Unexpected onerror callback fired');

  mediaRecorder.onwarning = function () {
    ok(false, 'Unexpected onwarning callback fired');

  // This handler verifies that only a single onstop event handler is fired.
  mediaRecorder.onstop = function () {
    if (onStopFired) {
      ok(false, 'onstop unexpectedly fired more than once');
    } else {
      onStopFired = true;

      // ondataavailable should always fire before onstop
      if (onDataAvailableFired) {
      } else {
        ok(false, 'onstop fired without an ondataavailable event first');

  // This handler verifies that only a single ondataavailable event handler
  // is fired with the blob generated having greater than zero size
  // and a correct mime type.
  mediaRecorder.ondataavailable = function (evt) {
    if (onDataAvailableFired) {
        ok(false, 'ondataavailable unexpectedly fired more than once');
    } else {
      onDataAvailableFired = true;

      ok(evt instanceof BlobEvent,
         'Events fired from ondataavailable should be BlobEvent');
      is(evt.type, 'dataavailable',
         'Event type should dataavailable');

      // The initialization of encoder can be cancelled.
      // On some platforms, the stop method may run after media stream track
      // available, so the blob can contain the header data.
      is(, expectedMimeType,
         'Blob data received and should have mime type');
      is(mediaRecorder.mimeType, expectedMimeType,
         'Media Recorder mime type in ondataavailable = ' + expectedMimeType);
      ok( >= 0, 'Blob size can not be negative');

      // onstop should not have fired before ondataavailable
      if (onStopFired) {
        ok(false, 'ondataavailable unexpectedly fired later than onstop');

  // This handler completes a start and stop of recording and verifies
  // respective media recorder state.
  element.onloadedmetadata = function () {
    element.onloadedmetadata = null;;
    is(mediaRecorder.state, 'recording', 'Media recorder should be recording');
       'Media recorder stream = element stream at the start of recording');

    is(mediaRecorder.state, 'inactive',
       'Media recorder is inactive after being stopped');
       'Media recorder stream = element stream post recording');

  element.preload = "metadata";

manager.runTests(gMediaRecorderTests, startTest);