????2.???Shim?滻???????
???????????????????????????????????????????????????DateTime.Now???????????????????????????DateTime??.NET???????????????????????????????????????????MS Fakes????????????????
??????????

?????????????????????
??????Tests??????System???????Fakes????

???????Shim?????????

???????в????
????Ctrl+T+R

??????????????????????MS Fakes??????滻??DateTime.Now??????????????????
????Shim???????滻????????????????????檔
????3.???Shim?滻???????????????
????Students??

?????????????

????4.???Shim?滻??????????????
?????????????Student??

????????Stu.Instance????????Student?????Instance??GetName???????滻?ɡ?
???????Shim????????????????飬?????????????