<!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();
  channel[0] = channel.port1;
  channel[1] = channel.port2;
  channel.length = 2;
  postMessage('', '*', channel);
  onmessage = t.step_func(function(e) {
    assert_equals(e.ports.length, 2);
    t.done();
  });
});
</script>