Improve dialect test coverage

[j6k4m8]

No description provided.

[codecov-commenter]

Codecov Report

Merging #37 (62592d0) into master (26c736a) will increase coverage by 4.15%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #37      +/-   ##
==========================================
+ Coverage   71.51%   75.67%   +4.15%     
==========================================
  Files          18       18              
  Lines        1355     1451      +96     
==========================================
+ Hits          969     1098     +129     
+ Misses        386      353      -33     

Impacted Files	Coverage Δ
grand/__init__.py	100.00% <100.00%> (ø)
grand/backends/backend.py	83.69% <100.00%> (+2.79%)	⬆️
grand/dialects/__init__.py	85.71% <100.00%> (+17.39%)	⬆️
grand/dialects/test_dialect.py	100.00% <100.00%> (ø)
grand/backends/_networkx.py	87.50% <0.00%> (+7.50%)	⬆️

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