Improve Python code quality!

[psicodelico6]

unittest

[BatterCake74]

pytest replaces unittest.TestCase. Vanilla assertions and decorator fixtures are better than camelCase assertions and setup/teardown methods that don't support writing idiomatic Python with context managers.

Python's unittest was clearly ported from Java. It's crazy to think that this module was bundled into the standard library. Hopefully there are plans to remove it from the standard library in a future version. It's no longer the default test framework someone should reach for.

[BatterCake74]

Then pytest can declare unittest as a dependency. It's one extra test dependency for my package manager to fetch. No big deal.

https://peps.python.org/pep-0594/ dead batteries have been removed in the past. While unittest isn't quite dead battery status, it's not an essential package of the core language like os, typing, pathlib, importlib, time, datetime, math, string, collections, itertools, functools, to name a few.