66 write service file tests

[ErinKelley17]

Files Edited

• backend/src/services/tests/unit/auth.service.test.ts
• backend/src/services/tests/unit/issue.service.test.ts
• backend/src/services/tests/unit/login.service.test.ts
• backend/src/services/tests/unit/upvote.service.test.ts

will likely need to revisit upvote.service.test.ts since we are still having problems with it in on our phones

Run Tests

• npm run test