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chromium/third_party/blink/web_tests/external/wpt/workers/semantics/run-a-worker/003.html 

<!doctype html>
<title>handling for 404 response</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
async_test(t => {
  const worker = new Worker('404_worker');
  worker.onerror = e => t.done();
}, 'worker');

async_test(t => {
  const shared = new SharedWorker('404_shared');
  shared.onerror = e => t.done();
}, 'shared');
</script>