Backend: Unit Tests For Each Endpoint

[ethanbaruh]

• [x] Posts
  • [x] create_post_review
  • [x] update_post_review
  • [x] delete_post_review
  • [x] get_post_review
• [x] Auth
  • [x] create_user
  • [x] login
  • [x] update_user
  • [x] get_user