Adapt method validator and add test cases

[Momo-Not-Emo]

No description provided.

[JonasKlauke]

Thanks for the help 👍

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 13 lines in your changes are missing coverage. Please review.

Project coverage is 69.80%. Comparing base (d4f0096) to head (7037f52).

Files	Patch %	Lines
...n/java/sootup/core/validation/MethodValidator.java	0.00%	13 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             develop     #866      +/-   ##
=============================================
- Coverage      69.85%   69.80%   -0.06%     
  Complexity      4040     4040              
=============================================
  Files            311      311              
  Lines          15254    15266      +12     
  Branches        2600     2603       +3     
=============================================
  Hits           10656    10656              
- Misses          3743     3755      +12     
  Partials         855      855              

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