Fix: Improve tests for Definitions

[localheinz]

This PR

• improves tests for Definitions

[codecov]

Codecov Report

Merging #295 into main will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##               main     #295   +/-   ##
=========================================
  Coverage     98.52%   98.52%           
  Complexity      100      100           
=========================================
  Files            23       23           
  Lines           272      272           
=========================================
  Hits            268      268           
  Misses            4        4           

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