Improve backend tests

[sylvanie85]

Context

We want to improve backend testing, currently we test each route with a success case and an error case. The current problem is that our tests are dependent of the datastore and each tests commit changes to the database and therefore shouldn't be committed.

Objective

1. Add module tests to ensure that all functions work independently of the routes.
2. Making sure that all routes work.
3. Deleting the entries in the database if some are created

The file test_manage_folders.py is a good start and an example of what we want for route tests.

Acceptance criteria:

• new module test for datastore functions
• all routes have a unit test using a mock/patch for datastore functions :
• an end-to-end test verifies everything
• coverage must be at least 80% (pytest --cov=. --cov-fail-under=80 tests/ )

[sylvanie85]

I closed this issue so as not to leave any work pending before I leave (end of my internship). So far, here's what's been done about the issue:

• new test module to test each datastore function
• directory routes have a unit test using a mock/patch for datastore functions
• Required test coverage of 80% reached

I've opened a new issue ( #123 ) that follows this one because there's still a lot of work to be done on route testing with mocks to avoid using the database and Azure storage.