working couette flow case and pytest

[JonasErbesdobler]

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 69.0%. Comparing base (aa0e93a) to head (6626abd).

Files	Patch %	Lines
jax_sph/case_setup.py	0.0%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##            main     #20     +/-   ##
=======================================
+ Coverage   66.4%   69.0%   +2.5%     
=======================================
  Files         11      11             
  Lines       1353    1353             
=======================================
+ Hits         899     934     +35     
+ Misses       454     419     -35     

Flag	Coverage Δ
unittests	69.0% <0.0%> (+2.5%)	⬆️

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