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<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>
<pre id="test">
// Name: loadAlgorithmKeepPromisesPendingWhenNotPausing
// Case: step1: create an element with its paused member to be fause and networkState to be NETWORK_EMPTY.
// stpe2: invoke load() on the element and the load() leaves the promise pending.
// Expected result: the pending promise should finally be resolved.
let manager = new MediaTestManager;
function initTest(test, token) {
let element = document.createElement(getMajorMimeType(test.type));
// Invoke play() -> (1) the promise will be left pending.
// (2) invoke load() -> (1) set the networkState to be NETWORK_NO_SOURCE.
// (2) queue a task to run resouce selection algorithm.
(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 ${}.`);
).then( () => { manager.finished(token); } );
once(element, "play").then(() => {
// The resouce selection algorithm has been done.
// -> set the networkState to be NETWORK_EMPTY because there is no valid resource to load.
ok(element.networkState == HTMLMediaElement.NETWORK_EMPTY);
// Invoke load() again and since the networkState is NETWORK_EMPTY, the load() does not reject the pending promise.
// The load() will queue a task to run resouce selection algorithm which will change the readyState and finally resolve the pending promise.
element.src =;
// Since the networkState is NETWORK_EMPTY, the load() does not set paused to be true.
ok(!element.paused, `loadAlgorithmKeepPromisesPendingWhenNotPausing(${token}).paused should be false.`);
manager.runTests(gSmallTests, initTest);