Fix: Split defining and getting entities

[localheinz]

This PR

• splits defining and getting entities in tests

Follows #1.

[codecov]

Codecov Report

Merging #43 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master      #43   +/-   ##
=========================================
  Coverage     61.22%   61.22%           
  Complexity       81       81           
=========================================
  Files             8        8           
  Lines           196      196           
=========================================
  Hits            120      120           
  Misses           76       76

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