Remove redundant attributes

[siriak]

I'm removing those attributes because they are redundant. NUnit can already figure out that those are tests based on TestCase attribute.

• 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 (6922799) 94.50% compared to head (57e9dee) 94.50%.

Additional details and impacted files

@@ Coverage Diff @@ ## master #438 +/- ## ======================================= Coverage 94.50% 94.50% ======================================= Files 234 234 Lines 9843 9843 Branches 1455 1455 ======================================= Hits 9302 9302 Misses 381 381 Partials 160 160 

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