Convert fileformats/ff to pytest

[ESadek-MO]

🚀 Pull Request

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.43%. Comparing base (4141484) to head (1341ce2).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6899   +/-   ##
=======================================
  Coverage   90.43%   90.43%           
=======================================
  Files          91       91           
  Lines       24839    24839           
  Branches     4656     4656           
=======================================
  Hits        22463    22463           
  Misses       1608     1608           
  Partials      768      768           

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