Refactor testsets, fixes #25

[MichaelHatherly]

All testsets are now able to be run in isolation. Will speed up development cycles when iterating on new tests.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (ce01a73) 85.81% compared to head (ae41143) 85.81%.
Report is 1 commits behind head on main.

❗ Current head ae41143 differs from pull request most recent head 722fd8c. Consider uploading reports for the commit 722fd8c to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #27   +/-   ##
=======================================
  Coverage   85.81%   85.81%           
=======================================
  Files           5        5           
  Lines         430      430           
=======================================
  Hits          369      369           
  Misses         61       61           

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