feature/tests: add more tests and refactor Makefile for race tests

[KaymeKaydex]

• Makefile refactored for racetests
• Tests coverage up

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 32.20%. Comparing base (cf02580) to head (c8762cf).

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Additional details and impacted files

@@             Coverage Diff             @@
##           master      #52       +/-   ##
===========================================
+ Coverage   21.82%   32.20%   +10.37%     
===========================================
  Files           9        9               
  Lines         678      680        +2     
===========================================
+ Hits          148      219       +71     
+ Misses        524      447       -77     
- Partials        6       14        +8     

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