def setup_back_to_back(self, streaming=False):
a, b = socket.socketpair()
self.assertGreaterEqual(a.fileno(), 0)
self.assertGreaterEqual(b.fileno(), 0)
c1 = Client()
c1._s = a
c1.enable_server()
c1.standalone_server = True
if streaming:
c1.streaming = True
c1.rpc.streaming_enabled = True
c1.register_service('test', TestService())
c1.connect('fd://{0}'.format(a.fileno()))
self.assertTrue(c1.connected)
c2 = Client()
c2._s = b
c2.streaming = True
c2.connect('fd://{0}'.format(b.fileno()))
self.assertTrue(c2.connected)
return c1, c2
