test_play_promise_13.html

Enable keyboard shortcuts

<!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: loadAlgorithmDoesNotCancelTasks

// Case: re-invoke the load() on an element which had dispatched a task to resolve a promise.

// Expected result: the already dispatched promise should still be resolved with undefined.

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;

  // We must wait for "canplay" event; otherwise, invoke play() will lead to a

  // pending promise and will then be rejected by the following load().

  once(element, "canplay").then(() => {

    // The play() promise will be queued to be resolved immediately, which means

    // the promise is not in the pending list.

    element.play().then(

      (result) => {

        if (result == undefined) {

          ok(true, `${token} is resolved with ${result}.`);

        } else {

          ok(false, `${token} is resolved with ${result}.`);

},

      (error) => {

        ok(false, `${token} is rejected with ${error.name}.`);

    ).then( () => { manager.finished(token); } );

    element.src = test.name; // Re-invoke the load algorithm again.

});

manager.runTests(gSmallTests, initTest);

</script>