Improve test coverage

[iwamot]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 35.68%. Comparing base (9814964) to head (5401bcf).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #91      +/-   ##
==========================================
+ Coverage   35.36%   35.68%   +0.31%     
==========================================
  Files          11       11              
  Lines         639      639              
  Branches      143      143              
==========================================
+ Hits          226      228       +2     
+ Misses        411      410       -1     
+ Partials        2        1       -1     

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