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// Copyright 2018-2021 the Deno authors. All rights reserved. MIT license.
// NOTE: these are just sometests to test the TypeScript types. Real coverage is
// provided by WPT.
import {
assert,
assertEquals,
} from "../../../test_util/std/testing/asserts.ts";
import { deferred } from "../../../test_util/std/async/deferred.ts";
Deno.test("messagechannel", async () => {
const mc = new MessageChannel();
const mc2 = new MessageChannel();
assert(mc.port1);
assert(mc.port2);
const promise = deferred();
mc.port2.onmessage = (e) => {
assertEquals(e.data, "hello");
assertEquals(e.ports.length, 1);
assert(e.ports[0] instanceof MessagePort);
e.ports[0].close();
promise.resolve();
};
mc.port1.postMessage("hello", [mc2.port1]);
mc.port1.close();
await promise;
mc.port2.close();
mc2.port2.close();
});
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