chore: add missing stateless provider tests

[gruebel]

Related Issues

Fixes #295

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.89%. Comparing base (837fef9) to head (fe3747d).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #531      +/-   ##
==========================================
+ Coverage   97.86%   97.89%   +0.03%     
==========================================
  Files          39       39              
  Lines        1823     1849      +26     
==========================================
+ Hits         1784     1810      +26     
  Misses         39       39              

Flag	Coverage Δ
unittests	97.89% <100.00%> (+0.03%)	⬆️

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