<!DOCTYPE html>
<html>
<body>
<script src="../resources/js-test.js"></script>
<script>
description("Worker to worker communication via MessagePorts");

if (window.testRunner)
  window.testRunner.waitUntilDone();

const worker = (port) => new Promise(resolve => {
  const w = new Worker("worker-to-worker.js");
  w.postMessage({ port }, [port]);
  w.onmessage = (e) => {
    debug(e.data);
    resolve();
  };
});

const mc = new MessageChannel();
Promise.all([
  worker(mc.port1),
  worker(mc.port2),
]).then(() => {
  if (window.testRunner)
    window.testRunner.notifyDone();
});

</script>
</body>
</html>