Add additional unit tests for _check_operations_valid

[gsheni]

• Fixes Add additional unit tests for _check_operations_valid #92

[codecov]

Codecov Report

Patch coverage: 80.00% and project coverage change: -0.18 ⚠️

Comparison is base (96ee9c2) 87.97% compared to head (af29f01) 87.79%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #93      +/-   ##
==========================================
- Coverage   87.97%   87.79%   -0.18%     
==========================================
  Files          24       24              
  Lines         790      795       +5     
==========================================
+ Hits          695      698       +3     
- Misses         95       97       +2     

Impacted Files	Coverage Δ
trane/typing/inference_functions.py	80.15% <ø> (ø)
trane/core/prediction_problem_generator.py	93.45% <71.42%> (-1.69%)	⬇️
trane/typing/inference.py	100.00% <100.00%> (ø)

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