027.html - mozsearch

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This WPT test may be referenced by the following Test IDs:
- /webmessaging/with-ports/027.html - WPT Dashboard Interop Dashboard

<!doctype html>

<title>message channel as ports</title>

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

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

<div id=log></div>

<script>

async_test(function(t) {

  var channel = new MessageChannel();

  postMessage('', '*', [channel.port1, channel.port2]);

  onmessage = t.step_func(function(e) {

    assert_equals(e.ports.length, 2);

    t.done();

});

}, "MessageChannel's ports as MessagePort objects");

test(() => {

  var channel = new MessageChannel();

  channel[0] = channel.port1;

  channel[1] = channel.port2;

  channel.length = 2;

  assert_throws_js(TypeError,

                   () => { postMessage('', '*', channel) },

                   'Old-style WebIDL arrays must throw a type error');

}, "Old-style array objects");

</script>