Improve the tests

[Glutexo]

This is an umbrella task listing the issues with the current state of tests. There are many and can be solved incrementally. Let’s not forget about them.

• Make the tests structured – modules, subfolders… Make the tests structured #102
• Get rid of the HostWrapper class and its utils module Kill the HostWrapper class #194
• Fix (notoriously, not only) failing tests Failing metrics test #101, Fix update system profile test #264
• Use a different database for testing Running the tests destroys the current database #20
• Unify the tests – migrate them to pytest Unify the tests – migrate to Pytest #196
• Clean up the tests by fixtures and parametrization Unify the tests – migrate to Pytest #196
• Add more unit tests, ideally even to the API operations Unit test all the things #197
• Destroy database on setup Destroy database on test setup #199
• Test delete events (MQ producing) consistently and without unittest.mock Remove unittest.mock from API tests #280

… and possibly many others. Please add a separate issue for them and link them here once found.

[Glutexo]

Pytest, fixtures…