fix: DatabaseLive tests failing locally

[paulbalandan]

Description
Fixes #9668

Checklist:

• Securely signed commits
• Component(s) with PHPDoc blocks, only if necessary or adds value
• Unit testing, with >80% coverage
• User guide updated
• Conforms to style guide

[paulbalandan]

This fix, although passing, is not yet deterministic, as this assumes there's no database.db in the writable/ folder. After running the DB tests, the database db file remains, so the next local run will now cause test failures.

[neznaika0]

If I understood databases better (and I don't have some on unix), I would try to change the tests. Make them unique, without dependencies. PHPUnit has a randomization option, which is ideal for applying it to the entire project.

[paulbalandan]

Randomising the tests has been envisioned before but early attempts proved very difficult to implement as there are hidden interdependencies within the tests, especially the database tests. That's why up until now we don't have random testing and mutation testing cannot be setup also.

[paulbalandan]

This fix is okay for the meantime as we are not using randomised testing. Once we randomise the tests, we need to isolate and eliminate dependencies.

[neznaika0]

My local tests passed. Thanks!

[michalsn]

I'm glad you figured it out. Thanks @paulbalandan

[paulbalandan]

Thanks for the reviews!