Improve tests

[BraisGabin]

This is a boy scout PR. I'm just preparing the tests to add some more meat on them. I think that reviewing it commit by commit will help to understand it.

[codecov]

Codecov Report

Merging #3618 (3fb8ad1) into main (7c4a690) will not change coverage.
The diff coverage is n/a.

❗ Current head 3fb8ad1 differs from pull request most recent head 85b1568. Consider uploading reports for the commit 85b1568 to get more accurate results

@@            Coverage Diff            @@
##               main    #3618   +/-   ##
=========================================
  Coverage     77.58%   77.58%           
  Complexity     2832     2832           
=========================================
  Files           465      465           
  Lines          8807     8807           
  Branches       1720     1720           
=========================================
  Hits           6833     6833           
  Misses         1047     1047           
  Partials        927      927           

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[picklebento]

Thanks for adding test coverage for type resolution and detektTest