new_contents: import os
  import sys
  import socket
  import atexit
  
  import cherrypy
  from cherrypy.test import helper
  from cherrypy._cpcompat import HTTPConnection
  
  
  USOCKET_PATH = os.path.join(
      os.path.dirname(os.path.realpath(__file__)),
      'cp_test.sock'
  )
  
  
  class USocketHTTPConnection(HTTPConnection):
      """
      HTTPConnection over a unix socket.
      """
  
      def __init__(self, path):
          HTTPConnection.__init__(self, 'localhost')
          self.path = path
  
      def __call__(self, *args, **kwargs):
          """
          Catch-all method just to present itself as a constructor for the
          HTTPConnection.
          """
          return self
  
      def connect(self):
          """
          Override the connect method and assign a unix socket as a transport.
          """
          sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
          sock.connect(self.path)
          self.sock = sock
          atexit.register(lambda: os.remove(self.path))
  
  
  def skip_on_windows(method):
      """
      Decorator to skip the method call if the test is executing on Windows.
      """
      def wrapper(self):
          if sys.platform == "win32":
              return self.skip("No UNIX Socket support in Windows.")
          else:
              return method(self)
      wrapper.__doc__ = method.__doc__
      wrapper.__name__ = method.__name__
      return wrapper
  
  
  
  class WSGI_UnixSocket_Test(helper.CPWebCase):
      """
      Test basic behavior on a cherrypy wsgi server listening
      on a unix socket.
  
      It exercises the config option `server.socket_file`.
      """
      HTTP_CONN = USocketHTTPConnection(USOCKET_PATH)
  
  
      @staticmethod
      def setup_server():
          class Root(object):
  
              @cherrypy.expose
              def index(self):
                  return "Test OK"
  
              @cherrypy.expose
              def error(self):
                  raise Exception("Invalid page")
  
          config = {
              'server.socket_file': USOCKET_PATH
          }
          cherrypy.config.update(config)
          cherrypy.tree.mount(Root())
  
      def tearDown(self):
          cherrypy.config.update({'server.socket_file': None})
  
      @skip_on_windows
      def test_simple_request(self):
          self.getPage("/")
          self.assertStatus("200 OK")
          self.assertInBody("Test OK")
  
      @skip_on_windows
      def test_not_found(self):
          self.getPage("/invalid_path")
          self.assertStatus("404 Not Found")
  
      @skip_on_windows
      def test_internal_error(self):
          self.getPage("/error")
          self.assertStatus("500 Internal Server Error")
          self.assertInBody("Invalid page")
  
subject: Add a basic test case for the unix socket support in cherrypy.