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Bug 1642590 - part2 : add test. r=bryce

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Differential Revision: https://phabricator.services.mozilla.com/D79926
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alwu 2020-06-17 20:50:08 +00:00
parent 6a60b27685
commit 110c2fe364
2 changed files with 47 additions and 0 deletions
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1
dom/media/test/mochitest.ini
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@ -974,6 +974,7 @@ scheme=https
[test_networkState.html]
[test_new_audio.html]
[test_no_load_event.html]
[test_not_reset_playbackRate_when_removing_nonloaded_media_from_document.html]
[test_paused.html]
[test_paused_after_ended.html]
[test_play_events.html]

46
dom/media/test/test_not_reset_playbackRate_when_removing_nonloaded_media_from_document.html Normal file
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@ -0,0 +1,46 @@
<!DOCTYPE HTML>
<html>
<head>
<title>Do not reset playback rate when removing non-loaded media from a document</title>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<script src="manifest.js"></script>
<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
</head>
<body>
<script class="testbody" type="text/javascript">
/**
* When removing media from a document, it should only trigger internal pause,
* instead of the pause method, which would trigger loading process and reset
* the media's playback rate for non-loaded media.
*/
async function startTest() {
info(`create a media and append it to a document`);
const audio = document.createElement("audio");
document.body.appendChild(audio);
info(`change audio's playbackRate and remove it from a document`);
const expectedRate = 0.1;
audio.playbackRate = expectedRate;
await once(audio, "ratechange");
is(audio.playbackRate, expectedRate,
`${audio.playbackRate} is equal to ${expectedRate}`);
audio.remove();
info(`queue a macrotask to check if the playback rate is still unchanged`);
setTimeout(() => {
// If we unexpectedly reset the playback rate, it would happen in a
// microtask when removing media from a document [1] (Await a stable state),
// which would always be run before the macrotask.
// [1] https://html.spec.whatwg.org/#playing-the-media-resource:remove-an-element-from-a-document
is(audio.playbackRate, expectedRate,
`${audio.playbackRate} is equal to ${expectedRate}`);
SimpleTest.finish();
}, 0);
}
SimpleTest.waitForExplicitFinish();
onload = startTest;
</script>
</body>
</html>