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Test Info:
- This WPT test may be referenced by the following Test IDs:
- /mediacapture-streams/MediaDevices-after-discard.https.html - WPT Dashboard Interop Dashboard
<!doctype html>
<title>Test promises from MediaDevices methods in a discarded browsing
context</title>
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<script src=/resources/testdriver.js></script>
<script src=/resources/testdriver-vendor.js></script>
<script src=permission-helper.js></script>
<body></body>
<script>
let devices;
let child_DOMException;
setup(() => {
const frame = document.createElement('iframe');
document.body.appendChild(frame);
devices = frame.contentWindow.navigator.mediaDevices;
child_DOMException = frame.contentWindow.DOMException;
frame.remove();
});
// If the current settings object's responsible document is NOT fully active,
// return a promise rejected with a DOMException object whose name attribute
// has the value "InvalidStateError".
promise_test(async () => {
await setMediaPermission("granted", ["microphone"]);
// `catch()` is used rather than static Promise methods because microtasks
// for `PromiseResolve()` do not run when Promises in inactive Documents are
// involved. Whether microtasks for `catch()` run depends on the realm of
// the handler rather than the realm of the Promise.
let promise_already_rejected = false;
let rejected_reason;
devices.getUserMedia({audio:true}).catch(reason => {
promise_already_rejected = true;
rejected_reason = reason;
});
// Race a settled promise to check that the returned promise is already
// rejected.
await Promise.reject().catch(() => {
assert_true(promise_already_rejected,
'should have returned an already-rejected promise.');
assert_throws_dom('InvalidStateError', child_DOMException,
() => { throw rejected_reason });
});
}, 'getUserMedia() in a discarded browsing context');
// Device enumeration can proceed steps return false when device enumeration
// can be exposed is true and the document is not fully active.
promise_test(async () => {
let promise_state = 'pending';
// `then()` is used to avoid methods that apply `PromiseResolve()` to
// Promises from inactive realms, which would lead to microtasks that don't
// run.
devices.enumerateDevices().then(() => promise_state = 'resolved',
() => promise_state = 'rejected');
// Enumerate in the parent document to provide enough time to check that the
// Promise from the inactive document does not settle.
await navigator.mediaDevices.enumerateDevices();
assert_equals(promise_state, 'pending', 'Promise state');
}, 'enumerateDevices() in a discarded browsing context');
</script>