Add more tests

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[codecov-commenter]

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Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 85.56%. Comparing base (6f358a4) to head (f82ca4f).
⚠️ Report is 4 commits behind head on master.

Files with missing lines	Patch %	Lines
src/lib.rs	0.00%	1 Missing ⚠️
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Additional details and impacted files

@@             Coverage Diff             @@
##           master       #4       +/-   ##
===========================================
+ Coverage   68.01%   85.56%   +17.54%     
===========================================
  Files           3        3               
  Lines         469      464        -5     
===========================================
+ Hits          319      397       +78     
+ Misses        150       67       -83     

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