Replace Assert statements with Shouldly

[sungam3r]

fixes #157 Current usages:

I don't think it's worth to try change these calls to something else.

[sungam3r]

Before changing Release to Debug

After

[sonarcloud[bot]]

Quality Gate failed

Failed conditions
6.2% Duplication on New Code (required ≤ 3%)

See analysis details on SonarCloud

[sonarcloud[bot]]

Quality Gate failed

Failed conditions
6.2% Duplication on New Code (required ≤ 3%)

See analysis details on SonarCloud

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (066abea) 96.58% compared to head (06c8f6a) 96.58%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #158 +/- ## ======================================= Coverage 96.58% 96.58% ======================================= Files 8 8 Lines 351 351 Branches 42 42 ======================================= Hits 339 339 Misses 5 5 Partials 7 7 ```

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