code: def unix_server(self, *args, **kwargs):
      if not hasattr(socket, "AF_UNIX"):
          raise NotImplementedError
      return self.tcp_server(*args, family=socket.AF_UNIX, **kwargs)
  
imports: import asyncio
  import asyncio.events
  import contextlib
  import os
  import pprint
  import select
  import socket
  import tempfile
  import threading
  from test import support
label_desc: Use image node_id 8 for calling the FunctionalTestCaseMixin obj's underlying member method code with example usage: obj.unix_server() and returns: self