Fix: Add more tests for FixtureFactory::defineEntity()

[localheinz]

This PR

• adds more tests for FixtureFactory::defineEntity()

Follows #1.

[codecov]

Codecov Report

Merging #60 into master will not change coverage by %.
The diff coverage is 86.66%.

@@            Coverage Diff            @@
##             master      #60   +/-   ##
=========================================
  Coverage     93.56%   93.56%           
  Complexity       80       80           
=========================================
  Files             8        8           
  Lines           202      202           
=========================================
  Hits            189      189           
  Misses           13       13           

Impacted Files	Coverage Δ	Complexity Δ
src/FixtureFactory.php	91.11% <86.66%> (ø)	37.00 <4.00> (ø)

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