postMessage_ports_readonly_array.htm

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This WPT test may be referenced by the following Test IDs:
- /workers/postMessage_ports_readonly_array.htm - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<title> postMessage(): read-only ports array </title>

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<div id=log></div>

<script>

"use strict";

async_test(function(t) {

  var channel = new MessageChannel();

  var targetPort = channel.port2;

  targetPort.start();

  targetPort.addEventListener("message", t.step_func_done(function(e) {

    var channel3 = new MessageChannel();

    assert_throws_js(TypeError, () => {

      e.ports.push(channel3.port1);

    }, "ports is a frozen object");

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

  }), true);

  var channel2 = new MessageChannel();

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

});

</script>