fix: add test cases

[viney-shih]

Description

• add test cases for event_enum.go generated by go-generate

[codecov]

Codecov Report

Merging #6 (833135c) into master (7428dc0) will increase coverage by 1.29%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master       #6      +/-   ##
==========================================
+ Coverage   87.03%   88.33%   +1.29%     
==========================================
  Files          11       11              
  Lines         540      540              
==========================================
+ Hits          470      477       +7     
+ Misses         42       35       -7     
  Partials       28       28              

Impacted Files	Coverage Δ
event_enum.go	100.00% <0.00%> (+70.00%)	⬆️

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