REFACTOR: test_12_1_post processing

[nunesanderson]

Description

Refactor test_12_1_post processing file.

Issue linked

close #6182

Checklist

• I have tested my changes locally.
• I have added necessary documentation or updated existing documentation.
• I have followed the coding style guidelines of this project.
• I have added appropriate tests (unit, integration, system).
• I have reviewed my changes before submitting this pull request.
• I have linked the issue or issues that are solved by the PR if any.
• I have agreed with the Contributor License Agreement (CLA).

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.18%. Comparing base (9c68b0a) to head (6039068).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6200      +/-   ##
==========================================
+ Coverage   84.06%   85.18%   +1.12%     
==========================================
  Files         170      170              
  Lines       64179    64179              
==========================================
+ Hits        53955    54674     +719     
+ Misses      10224     9505     -719     

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