transfer-mediasourcehandle.html

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This test has a WPT meta file that expects 1 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /html/infrastructure/safe-passing-of-structured-data/transfer-mediasourcehandle.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<meta charset="utf-8">

<title>MessageChannel transfer of MediaSourceHandle</title>

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<script>

promise_test(async t => {

    const worker = new Worker(URL.createObjectURL(new Blob([`

        const ms = new ManagedMediaSource();

        const handle = ms.handle;

        self.postMessage(handle, [handle]);

    `], { type: "text/javascript" })));

    const handle = await new Promise((resolve, reject) => {

        worker.onmessage = e => resolve(e.data);

        worker.onerror = e => { e.preventDefault(); reject(e.message); };

});

    worker.terminate();

    const channel = new MessageChannel();

    const received = new Promise(resolve => {

        channel.port2.onmessage = e => resolve(e.data);

});

    channel.port1.postMessage(handle, [handle]);

    const copy = await received;

    assert_true(copy instanceof MediaSourceHandle);

}, "MediaSourceHandle can be transferred through a MessageChannel");

</script>