Revert "Refactor testing"

[gibahjoe]

Reverts #108

was merged in error

[codecov]

Codecov Report

Attention: 8 lines in your changes are missing coverage. Please review.

Comparison is base (bfb0ec4) 90.50% compared to head (0ccca8b) 84.56%.
Report is 5 commits behind head on master.

Files	Patch %	Lines
...ns/lib/src/openapi_generator_annotations_base.dart	20.00%	8 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #123      +/-   ##
==========================================
- Coverage   90.50%   84.56%   -5.94%     
==========================================
  Files           8        1       -7     
  Lines         579      162     -417     
==========================================
- Hits          524      137     -387     
+ Misses         55       25      -30     

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