private fun WebSocketExtensions.isValid(): Boolean {
    // If the server returned parameters we don't understand, fail the web socket.
    if (unknownValues) return false

    // If the server returned a value for client_max_window_bits, fail the web socket.
    if (clientMaxWindowBits != null) return false

    // If the server returned an illegal server_max_window_bits, fail the web socket.

  }

  @Test
  @Throws(Exception::class)
  fun clientMaxWindowBitsIncluded() {
    extensionNegotiationFailure("permessage-deflate; client_max_window_bits=15")
  }

  @Test
  @Throws(Exception::class)
  fun serverMaxWindowBitsTooLow() {
    extensionNegotiationFailure("permessage-deflate; server_max_window_bits=7")
  }

  @Test