API: Users Models tests #508
Description
We need to add tests for the following:
- CustomUserManager.create_user returns a user if the user's email ends with uwaterloo.ca or the email is teamumigrate@gmail.com, or raises an error otherwise.
- CustomUser.delete deletes the profile_photo and/or background_photo from the file system.
- Photo.delete does not throw an exception when there are no profile_photo and/or background_photo.
- Photo.save deletes the old profile_photo and/or background_photo from the file system when being replaced with new ones (can be None).
- Photo.save does not throw an exception when there are no old profile_photo and/or background_photo.