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// 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();
}
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