test_messageChannel.js

Enable keyboard shortcuts

/* Any copyright is dedicated to the Public Domain.

 * http://creativecommons.org/publicdomain/zero/1.0/ */

add_task(async function() {

  let sb = new Cu.Sandbox('http://www.example.com',

                          { wantGlobalProperties: ["MessageChannel"] });

  sb.ok = ok;

  Cu.evalInSandbox('ok((new MessageChannel()) instanceof MessageChannel);',

                   sb);

  Cu.evalInSandbox('ok((new MessageChannel()).port1 instanceof MessagePort);',

                   sb);

  Cu.importGlobalProperties(["MessageChannel"]);

  let mc = new MessageChannel();

  Assert.ok(mc instanceof MessageChannel);

  Assert.ok(mc.port1 instanceof MessagePort);

  Assert.ok(mc.port2 instanceof MessagePort);

  mc.port1.postMessage(42);

  let result = await new Promise(resolve => {

    mc.port2.onmessage = e => {

      resolve(e.data);

});

  Assert.equal(result, 42);

});