Feature/168 tests

[Sevitas]

Motivation

Fixes #168

Checklist

• [x] Code follows coding conventions held in this repo
• [x] Automated tests have been added
• [x] Tests are passing
• [x] Docs have been updated (if applicable)
• [x] Temporary settings (e.g. variables used during development and testing) have been reverted to defaults

How to test

the number of tests is equal or greater than the master's count

[codecov[bot]]

Codecov Report

Merging #178 (87d8f0a) into master (5a0b662) will decrease coverage by 2.25%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #178      +/-   ##
==========================================
- Coverage   91.31%   89.07%   -2.25%     
==========================================
  Files          33       33              
  Lines        1255     1263       +8     
  Branches      129      130       +1     
==========================================
- Hits         1146     1125      -21     
- Misses        106      111       +5     
- Partials        3       27      +24     

Impacted Files	Coverage Δ
...elGenerator.Core/Helpers/ClassDeclarationHelper.cs	100.00% <100.00%> (ø)

... and 14 files with indirect coverage changes

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