Convert ff/rules to pytest

[ESadek-MO]

🚀 Pull Request

Tiny change, all seems to be good otherwise!

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.43%. Comparing base (bb0ef8c) to head (695a184).
⚠️ Report is 10 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6897      +/-   ##
==========================================
+ Coverage   90.40%   90.43%   +0.02%     
==========================================
  Files          91       91              
  Lines       24833    24839       +6     
  Branches     4653     4656       +3     
==========================================
+ Hits        22451    22463      +12     
+ Misses       1612     1608       -4     
+ Partials      770      768       -2     

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