gecko-dev/dom/media/test/test_play_promise_18.html

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HTML

<!DOCTYPE HTML>
<html>
<head>
<title>Media test: promise-based play() method</title>
<script type="text/javascript" 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: 'playing' event should come before promise resolving
// Case: invoke play() on an element which has valis source
// Expected result: receive a 'playing' event before the promise is resolved
let manager = new MediaTestManager;
function initTest(test, token) {
manager.started(token);
let element = document.createElement(getMajorMimeType(test.type));
element.src = test.name;
element.receivedPlayingEvent = false;
element.addEventListener("playing", () => {
element.receivedPlayingEvent = true;
});
element.play().then(
(result) => {
if (result == undefined && element.receivedPlayingEvent) {
ok(true, `${token} is resolved with ${result}.`);
} else {
ok(false, `${token} is resolved with ${result} and receivedPlayingEvent = ${element.receivedPlayingEvent}`);
}
},
(error) => {
ok(false, `${token} is rejected with ${error.name}.`);
}
).then( () => { manager.finished(token); } );
}
manager.runTests(gSmallTests, initTest);
</script>