from mock import *

class Test:
	def a(self):
		print('Test')

class Mock:
	def	a(self):
		print('Mock')

@patch('__main__.Test', new=Mock)
def patched_class():
	t=Test()
	t.a()

def not_patched_class():
	t=Test()
	t.a()

patched_class()
not_patched_class()