test:auth test code

[KangSanLee24]

https://github.com/ysys29/p6.teamTrello/issues/45

• [x] auth.service.spec.ts

• [x] signUp

• [x] signIn

• [x] validateUser

• [ ] auth.controller.spec.ts

• [ ] signUp

• [ ] signIn

• [ ] jwt.strategy.ts

• [ ] local.strategy.ts

[KangSanLee24]

auth.servoce.ts 에 findEmail({email}) 대신에 findEmailByToken({token})으로 바꾼거 날아감~~