Clean up after test run? / If tests pass, and are immediately rerun, should pass again.

> The tests also create an uploads directory in the root higlass-server directory. Can this be placed in /tmp and removed when the tests finished?
>
> Same for db_test.sqlite3.

I am not sure about this. I think we want to be sure tests can be run repeatedly, and if the test fails it can be good to hold on to artifacts from the past run... I guess I don't see cleaning up from a successful run as so important: It's more important to be able to rerun reliably after failed tests.

I might be looking at this the wrong way.