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chromium/third_party/blink/web_tests/external/wpt/websockets/opening-handshake/005.html 

<!doctype html>
<title>WebSockets: response header and close frame in same packet</title>
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<script src=../constants.sub.js></script>
<meta name="variant" content="?default">
<meta name="variant" content="?wss">
<div id=log></div>
<script>
async_test(function(t) {
  var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/simple_handshake');
  ws.onmessage = t.unreached_func();
  ws.onopen = t.step_func(function(e) {
    ws.onclose = t.step_func(function(e) {
      assert_equals(e.wasClean, true);
      assert_equals(e.code, 1001);
      assert_equals(e.reason, 'PASS');
      ws.onclose = t.unreached_func('onclose should not be called twice');
      t.step_timeout(() => t.done(), 50);
    })
    ws.close();
  })
  ws.onclose = t.unreached_func('onclose should not be called before onopen');
});
</script>