improve test coverage for addDefinition

[TianTianBigWang]

No description provided.

[codecov]

Codecov Report

Base: 88.61% // Head: 90.59% // Increases project coverage by +1.98% 🎉

Coverage data is based on head (634994a) compared to base (c385f15).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #18      +/-   ##
==========================================
+ Coverage   88.61%   90.59%   +1.98%     
==========================================
  Files          11       11              
  Lines         808      808              
==========================================
+ Hits          716      732      +16     
+ Misses         83       69      -14     
+ Partials        9        7       -2     

Flag	Coverage Δ
all	90.59% <ø> (+1.98%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
api.go	83.60% <0.00%> (+6.39%)	⬆️

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