third_party/web_platform_tests/websockets/constructor.html

<!DOCTYPE html>
<title>WebSocket constructor</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="websocket.js?pipe=sub"></script>
<div id="log"></div>
<script>
test(function() {
  var ws = new WebSocket("ws://" + __SERVER__NAME + ":" + __PORT + "/" + __PATH,
                         "echo", "Stray argument")
  assert_true(ws instanceof WebSocket, "Expected a WebSocket instance.")
}, "Calling the WebSocket constructor with too many arguments should not throw.")
</script>