code: def _connected_pair(self):
      client = socket.socket()
      client.setblocking(False)
      try:
          client.connect(
              ("127.0.0.1", self.serverSocket.getsockname()[1])
          )
      except OSError as e:
          self.assertEqual(e.args[0], errno.EINPROGRESS)
      else:
          raise AssertionError("Connect should have raised EINPROGRESS")
      server, addr = self.serverSocket.accept()
  
      self.connections.extend((client, server))
      return client, server
  
imports: import errno
  import os
  import select
  import socket
  import time
  import unittest
  from test import support
label_desc: Use image node_id 3 for calling the TestEPoll obj's underlying member method code with example usage: obj._connected_pair() and returns: client,  server