1 CONSOLE ERROR: line 15: WebSocket connection to 'ws://localhost:8880/handshake-fail-by-extensions-header' failed: Error during WebSocket handshake: Found an unsupported extension 'x-foo' in 'Sec-WebSocket-Extensions' header
2 Test whether WebSocket handshake fails if the server sends Sec-WebSocket-Extensions header.
4 On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
6 PASS closeEvent.wasClean is false
7 PASS successfullyParsed is true