#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!