Tests for polymorphic use cases

[MateuszKubuszok]

No description provided.

[codecov-io]

Codecov Report

Merging #60 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master      #60   +/-   ##
=======================================
  Coverage   86.71%   86.71%           
=======================================
  Files           7        7           
  Lines         286      286           
  Branches       60       60           
=======================================
  Hits          248      248           
  Misses         38       38

Impacted Files	Coverage Δ
...scalaland/chimney/internal/TransformerMacros.scala	83.24% <100%> (ø)	⬆️

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