Fix: Add tests

[localheinz]

This PR

• adds tests

Slightly related to #365.

[codecov]

Codecov Report

Merging #367 into main will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##               main     #367   +/-   ##
=========================================
  Coverage     98.95%   98.95%           
  Complexity      102      102           
=========================================
  Files            23       23           
  Lines           288      288           
=========================================
  Hits            285      285           
  Misses            3        3           

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