test_messageEvent_init.html

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<html><head>

<title>Test for bug 1308956</title>

<link rel="stylesheet" href="/tests/SimpleTest/test.css">

<script src="/tests/SimpleTest/SimpleTest.js"></script>

<script src="/tests/SimpleTest/EventUtils.js"></script>

<body>

  <script>

var a = new MessageEvent("message")

ok(!!a, "We have a MessageEvent");

is(a.ports.length, 0, "By default MessageEvent.ports is an empty array");

a.initMessageEvent("message", true, false, {}, window.location.href, "", null, []);

ok(Array.isArray(a.ports), "After InitMessageEvent() we have an array");

is(a.ports.length, 0, "Length is 0");

var mc = new MessageChannel();

a.initMessageEvent("message", true, false, {}, window.location.href, "", null, [mc.port1]);

ok(Array.isArray(a.ports), "After InitMessageEvent() we have an array");

is(a.ports.length, 1, "Length is 1");

  </script>

</body>

</html>