Converted fileformats/pp to pytest

[ESadek-MO]

🚀 Pull Request

Description

THere's a todo I've left. Technically, unittest.mock is still allowable, but more importantly it creates a problem I can't solve if I remove it.

[HGWright]

A few small changes, that should also fix the tests on this PR.

Worth noting that there are some PT ruff checks still failing after these changes:

PT031
PT006
PT011

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.18%. Comparing base (ec2e6af) to head (e678bb8).
⚠️ Report is 58 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6904   +/-   ##
=======================================
  Coverage   90.18%   90.18%           
=======================================
  Files          91       91           
  Lines       24822    24822           
  Branches     4656     4656           
=======================================
  Hits        22385    22385           
  Misses       1669     1669           
  Partials      768      768           

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[HGWright]

Thanks @ESadek-MO