perf(test): optimize code

[flc1125]

close: #7

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.42%. Comparing base (5c28406) to head (0c088fb).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master       #9      +/-   ##
==========================================
- Coverage   94.61%   94.42%   -0.19%     
==========================================
  Files           1        1              
  Lines         297      323      +26     
==========================================
+ Hits          281      305      +24     
- Misses         14       16       +2     
  Partials        2        2              

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