chromium/third_party/blink/web_tests/external/wpt/workers/semantics/multiple-workers/008.html

<!doctype html>
<title>messagechannel in shared worker</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id=log></div>
<iframe src=008-1.html></iframe>
<script>
var t = async_test();
onload = t.step_func(function() {
  var w1 = new SharedWorker('008.js');
  w1.port.onmessage = this.step_func(function(e) {
    e.ports[0].onmessage = this.step_func(function(e) {
      assert_equals(e.data, 2);
      this.done();
    });
  });
  w1.onerror = this.unreached_func("error");
});
</script>