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chromium/third_party/blink/web_tests/external/wpt/workers/interfaces/WorkerGlobalScope/onerror/not-handled.html 

<!doctype html>
<title>onerror, "not handled"</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id="log"></div>
<script>
function createHandler(t) {
  return t.step_func(function(e) {
    assert_true(e instanceof ErrorEvent, 'e instanceof ErrorEvent');
    assert_equals(typeof e.message, 'string', 'typeof e.message');
    assert_equals(e.filename, document.URL.replace('.html', '.js'), 'e.filename');
    assert_equals(typeof e.lineno, 'number', 'typeof e.lineno');
    assert_equals(typeof e.colno, 'number', 'typeof e.column');
    e.preventDefault(); // "handled"
    t.done();
  });
}

async_test(function(t) {
  var worker = new Worker('not-handled.js');
  worker.onerror = createHandler(t);
}, 'Not handled evaluation error => Worker.onerror handler');

async_test(function(t) {
  var worker = new Worker('not-handled.js');
  worker.addEventListener('error', createHandler(t));
}, 'Not handled evaluation error => Worker error listener');
</script>