Function handler

src/tests/test_python_socket.py:65–68

(conn, _addr)

    server_received = []

    def handler(conn, _addr):
        data = conn.recv(1024)
        server_received.append(data)
        conn.sendall(RESPONSE_MESSAGE)

    @run_in_pyodide
    async def run(selenium, host, port, message):