Revert "Removed the getters from test_causal_test_case.py"

[f-allian]

Reverts #228

[github-actions]

🦙 MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ PYTHON	black	26		0	1.48s
✅ PYTHON	pylint	26		0	5.44s

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[codecov]

Codecov Report

Merging #229 (4b170fc) into main (c187754) will increase coverage by 0.14%.
Report is 1 commits behind head on main.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #229      +/-   ##
==========================================
+ Coverage   95.51%   95.65%   +0.14%     
==========================================
  Files          20       20              
  Lines        1405     1405              
==========================================
+ Hits         1342     1344       +2     
+ Misses         63       61       -2     

see 1 file with indirect coverage changes

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