mozilla-release/testing/web-platform/tests/webmessaging/Transferred_objects_unusable.sub.htm

<!DOCTYPE html>
<html>
<head>
<title> Transferred objects are no longer usable on the sending side </title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
</head>
<body>
<div id=log></div>

<div style="display:none">
    <iframe width="70%" onload="PostMessageTest()" src="{{location[scheme]}}://{{domains[www1]}}:{{location[port]}}/webmessaging/support/ChildWindowPostMessage.htm"></iframe>
</div>

<script>


    var description = "Test Description: " +
                      "Objects listed in transfer are transferred, not just cloned, meaning that they are " +
                      "no longer usable on the sending side.";

    var t = async_test(description);

    var DATA = {test: "e.ports[0].postMessage('TRANSFERRED')"};
    var TARGET = document.querySelector("iframe");
    var ExpectedResult = ["PING", "TRANSFERRED"];
    var ActualResult = [];

    function PostMessageTest()
    {
        test(function()
        {
            assert_own_property(window, "MessageChannel", "window");

            var channel = new MessageChannel();

            channel.port2.onmessage = t.step_func(VerifyResult);

            channel.port1.postMessage("PING");

            TARGET.contentWindow.postMessage(DATA, "*", [channel.port1]);

            channel.port1.postMessage("PONG");

        }, "MessageChannel is supported.");
    }

    function VerifyResult(e)
    {
        ActualResult.push(e.data)

        if (ActualResult.length >= ExpectedResult.length)
        {
            assert_array_equals(ActualResult, ExpectedResult, "ActualResult");
            t.done();
        }
    }
</script>
</body>
</html>