Convert test_loaders_pydantic.py to pytest format

[vladistan]

• Extract loader_test helper function from base class
• Convert 4 test methods to standalone functions
• Test both YAML and JSON loaders with different models

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.41%. Comparing base (bbf4f8b) to head (96d34dc).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #446   +/-   ##
=======================================
  Coverage   77.41%   77.41%           
=======================================
  Files          52       52           
  Lines        4476     4476           
  Branches     1303     1303           
=======================================
  Hits         3465     3465           
  Misses        783      783           
  Partials      228      228           

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[ialarmedalien]

use pytest.mark.parametrize instead of the individual test functions

tests failing

[vladistan]

weird... works on my machine :-(

[ialarmedalien]

The issue here is that there is a test somewhere that's creating the files that these tests are using for comparison (the files already exist if you've run the tests locally, which is why it's so hard to debug locally). Files need to be added to the repo for these comparisons to execute correctly. The potentially bigger problem is that some directories are being git-ignored and this problem may affect numerous files in the repo.