Run tests in /tmp

[jorisroovers]

run tests in /tmp to avoid gitlint picking up the .gitlint config

[webknjaz]

FTR if you were to use pytest, it'd provide built-in capabilities to use unique tmp dirs for testing via its fixtures like tmp_path. This way, you could achieve isolation that spreads beyond just CI and would work the same on the contributors' machines too.

[jorisroovers]

This way, you could achieve isolation that spreads beyond just CI and would work the same on the contributors' machines too.

You're absolutely right about this, I was being hasty here. Let me re-work this.

FWIW, we only use pytest to run tests today, we have no code-level dependency on it in our tests. For consistency reasons, I'm going to keep it this way - I have nothing against writing pytest-style tests (I do so in plenty of other projects), it's just that gitlint uses traditional unittest style tests and it will be jarring if we start mixing in pytest constructs at this point. If we want to start using pytest at the code level, it will require a more holistic approach. I don't think there's a strong argument for that at this time.

While I could fix this in ./run_tests.sh, in the context of #378, that's not the right thing to do. I'll have a look at fixing this in the unit tests itself.