Generell code coverage increasing

[olikra]

Added some missing tests on several classes - mainly on the init-part for classes @solegalli please have a look

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 98.07692% with 1 line in your changes missing coverage. Please review.

Project coverage is 97.87%. Comparing base (8cfab26) to head (b5fbbae).

Files	Patch %	Lines
feature_engine/creation/math_features.py	97.91%	0 Missing and 1 partial :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #777 +/- ## ========================================== + Coverage 97.52% 97.87% +0.34% ========================================== Files 107 108 +1 Lines 4283 4329 +46 Branches 854 865 +11 ========================================== + Hits 4177 4237 +60 + Misses 62 54 -8 + Partials 44 38 -6 ```

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[olikra]

Forget this comment - I sorted it out. Keep track tomorrow or on Friday @solegalli tox got updated yesterday from 4.15.1 to 4.16. I did a tox-run localy with both versions and all went fine:

On github the ci failed by an error in creation/CyclicalFeatures. But this class wasn't touched by me. I have no clue what's going on...