JOSS Review - unit tests

[mturiansky]

As part of the JOSS review, unit tests are required to demonstrate the functionality of the code:

Automated tests: Are there automated tests or manual steps described so that the functionality of the software can be verified?

While automated tests are not required, I would highly suggest implementing them using github actions as it will help with the long-term maintainability of the code. Similarly, I would recommend setting up a linter (but that's optional of course).

I see that there is something implemented in tests/, but it includes hard-coded paths, which are specific to the maintainer's system. These fail when I run it on my computer.

[thohamm]

fixed