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<!DOCTYPE html>
<meta charset=utf-8>
<link rel="help" href="https://html.spec.whatwg.org/multipage/comms.html#dom-messageport-close">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
// How long (in ms) these tests should wait before deciding no further messages
// will be received.
const time_to_wait_for_messages = 100;
async_test(t => {
const c = new MessageChannel();
c.port1.onmessage = t.unreached_func('Should not have delivered message');
c.port1.close();
c.port2.postMessage('TEST');
setTimeout(t.step_func_done(), time_to_wait_for_messages);
}, 'Message sent to closed port should not arrive.');
async_test(t => {
const c = new MessageChannel();
c.port1.onmessage = t.unreached_func('Should not have delivered message');
c.port2.close();
c.port2.postMessage('TEST');
setTimeout(t.step_func_done(), time_to_wait_for_messages);
}, 'Message sent from closed port should not arrive.');
async_test(t => {
const c = new MessageChannel();
c.port1.onmessage = t.unreached_func('Should not have delivered message');
c.port1.close();
const c2 = new MessageChannel();
c2.port1.onmessage = t.step_func(e => {
e.ports[0].postMessage('TESTMSG');
setTimeout(t.step_func_done(), time_to_wait_for_messages);
});
c2.port2.postMessage('TEST', [c.port2]);
}, 'Message sent to closed port from transferred port should not arrive.');
async_test(t => {
const c = new MessageChannel();
let isClosed = false;
c.port1.onmessage = t.step_func_done(e => {
assert_true(isClosed);
assert_equals(e.data, 'TEST');
});
c.port2.postMessage('TEST');
c.port2.close();
isClosed = true;
}, 'Inflight messages should be delivered even when sending port is closed afterwards.');
async_test(t => {
const c = new MessageChannel();
c.port1.onmessage = t.step_func_done(e => {
if (e.data == 'DONE') t.done();
assert_equals(e.data, 'TEST');
c.port1.close();
});
c.port2.postMessage('TEST');
c.port2.postMessage('DONE');
}, 'Close in onmessage should not cancel inflight messages.');
test(() => {
const c = new MessageChannel();
c.port1.close();
assert_throws("DataCloneError", () => self.postMessage(null, "*", [c.port1]));
self.postMessage(null, "*", [c.port2]);
}, "close() detaches a MessagePort (but not the one its entangled with)");
</script>
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