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Test Info: Warnings
- This test has a WPT meta file that expects 1 subtest issues.
- This WPT test may be referenced by the following Test IDs:
- /webmessaging/message-channels/close-event/garbage-collected.tentative.any.html - WPT Dashboard Interop Dashboard
- /webmessaging/message-channels/close-event/garbage-collected.tentative.any.worker.html - WPT Dashboard Interop Dashboard
// META: title=Close event test when an entangled port is GCed.
// META: script=/common/gc.js
/**
* Create a new MessageChannel and return port1 and a weak reference to port2.
* It is expected that port2 will be garbage collected and a close event
* will be fired on port1.
*
* @returns {Array.<[MessagePort, WeakRef<MessagePort>]>}
*/
function createMessageChannelAndWeakReferToPort() {
const {port1, port2} = new MessageChannel();
port1.start();
return [port1, new WeakRef(port2)];
}
promise_test(async t => {
const [port1, weakport2] = createMessageChannelAndWeakReferToPort();
const closeEventPromise = new Promise(resolve => port1.onclose = resolve);
garbageCollect();
await closeEventPromise;
assert_equals(weakport2.deref(), undefined, 'port2 should be GCed');
}, 'Entangled port is garbage collected, and the close event is fired.')