dom/media/test/test_play_promise_16.html


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<!DOCTYPE HTML>
<html>
<head>
  <title>Media test: promise-based play() method</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>
</head>
<body>
<pre id="test">

<script>
// Name: loadAlgorithmResolveOrdering
// Case: invoke load() on an element should resolve pending promises in order.
// Expected result: the pending promises are resolved in order.

let manager = new MediaTestManager;

function initTest(test, token) {
  manager.started(token);

  let element = document.createElement(getMajorMimeType(test.type));
  element.preload = "auto";
  element.src = test.name;
  once(element, "canplay").then(() => {
    let firstPromiseResolved = false;

    // play
    element.play().then(
      () => { firstPromiseResolved = true; },
      () => { ok(false,  `loadAlgorithmResolveOrdering(${token}) should not be rejected.`); }
    );

    // play again
    element.play().then(
      () => { ok(firstPromiseResolved, `loadAlgorithmResolveOrdering(${token}), the first play should already be resolved.`); },
      () => { ok(false,  `loadAlgorithmResolveOrdering(${token}) should not be rejected.`); }
    ).then( () => { manager.finished(token); } );

    // triger load
    element.src = test.name;
  });
}

manager.runTests(gSmallTests, initTest);

</script>