Channel_postMessage_ports_readonly_array.any.js

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This WPT test may be referenced by the following Test IDs:
- /webmessaging/Channel_postMessage_ports_readonly_array.any.html - WPT Dashboard Interop Dashboard
- /webmessaging/Channel_postMessage_ports_readonly_array.any.worker.html - WPT Dashboard Interop Dashboard

// META: title=postMessage(): read-only ports array

    "use strict";

    var TargetPort = null;

    var description = "The postMessage() method - Make new ports into a read only array.";

    var t = async_test("Test Description: " + description);

    var channel = new MessageChannel();

    TargetPort = channel.port2;

    TargetPort.start();

    TargetPort.addEventListener("message", t.step_func(TestMessageEvent), true);

    var channel2 = new MessageChannel();

    channel.port1.postMessage("ports", [channel2.port1]);

    function TestMessageEvent(evt)

        var channel3 = new MessageChannel();

        assert_throws_js(TypeError, () => {

            evt.ports.push(channel3.port1);

        }, "ports is a frozen object");

        assert_equals(evt.ports.length, 1, "ports is a read only array with length == 1.");

        t.done();