gistfile1.txt

@contextmanager
def socket_send_wrapper(send_args):
  def fake_send(*args, **kwargs):
    send_args.append(args, kwargs)
  mocked_send = patch("socket.send", fake_send)
  mocked_send.start()
  yield
  mocked_send.stop()


.... then in your test...

send_args = []
with socket_send_wrapper(send_args):
  run your test...
  check what got added to send_args...