#442 Update NUnit to 4.0.1

[MarcosSimoneli]

The NUnit package was updated to 4.0.1 and the corrections required by this update were made, the tests were executed successfully

• I have performed a self-review of my code
• My code follows the style guidelines of this project
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Comments in areas I changed are up to date
• I have added comments to hard-to-understand areas of my code
• I have made corresponding changes to the README.md

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (c7f0d62) 94.89% compared to head (68dbc7a) 94.94%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #443      +/-   ##
==========================================
+ Coverage   94.89%   94.94%   +0.04%     
==========================================
  Files         234      234              
  Lines        9843     9843              
  Branches     1382     1382              
==========================================
+ Hits         9341     9345       +4     
+ Misses        387      384       -3     
+ Partials      115      114       -1     

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[siriak]

Please also check why tests fail, it has something to do with precision. Everything else looks good!

[siriak]

And please also resolve conflicts so that I could merge

[siriak]

Looks good, thanks a lot!