Add unit tests

[andrewda]

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[snowsignal]

What would the tests look like, exactly?

[SUPERCILEX]

@andrewda lol, what he said 😂

[andrewda]

Making sure cv_utils.py functions work as intended, and maybe abstracting out some more methods and testing those. I basically want to make sure it works on the low-level with certain images.

[andrewda]

Right now we test that the output is what we expect, which is good and all, but making sure the individual steps work would be even better so we know what breaks when it breaks.

[SUPERCILEX]

Oh, K. Yeah, that SGTM.

[snowsignal]

I think we should use the unittest module for testing. I've used it before, and it's very complete and surprisingly easy to use.

[andrewda]

Yep. The problem right now is that the way this program is organized unit tests won't really work. We'll have to refactor quite a bit to make it all testable.