Write automated test that creates a new user every time

[eddiejaoude]

Description

When the tests run on an existing DB, the user is no longer created but updated.

A bug was recently found when new users log in with GitHub OAuth, so we need to test the login for new users

1. This could be done by generating a random mock user
   OR
2. Reset the DB everytime the tests run

I think option 1 is best, because we don't want to reset the DB in our local dev environment

Related issue #243

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Additional information

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