test__monkey.py: check if 'create_connection' was replaced

greentest/test__monkey.py

@@ -9,3 +9,7 @@ import threading
 assert 'built-in' not in repr(thread.start_new_thread), repr(thread.start_new_thread)
 assert 'built-in' not in repr(threading._start_new_thread), repr(threading._start_new_thread)
 assert 'built-in' not in repr(threading._sleep), repr(threading._sleep)
+
+import socket
+from gevent import socket as gevent_socket
+assert socket.create_connection is gevent_socket.create_connection