chromium/third_party/blink/web_tests/external/wpt/workers/constructors/SharedWorker/port-properties.html

<!doctype html>
<title>worker.port</title>
<link rel=help href="http://www.whatwg.org/html/#sharedworker">
<link rel=help href="http://www.whatwg.org/html/#messageport">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
test(() => {
  const worker = new SharedWorker('empty.js', '');
  assert_true('port' in worker, "port");
  assert_true('postMessage' in worker.port, "postMessage");
  assert_true('start' in worker.port, "start");
  assert_true('close' in worker.port, "close");
  assert_true('onmessage' in worker.port, "onmessage");
  assert_true('addEventListener' in worker.port, "addEventListener");
  assert_true('removeEventListener' in worker.port, "removeEventListener");
  assert_true('dispatchEvent' in worker.port, "dispatchEvent");
});
</script>