Improve Test Coverage

[svchb]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 94.73684% with 3 lines in your changes missing coverage. Please review.

Project coverage is 68.51%. Comparing base (c93ab39) to head (4464531).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...chemes/boundary/dummy_particles/dummy_particles.jl	96.42%	2 Missing ⚠️
test/callbacks/postprocess.jl	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #674      +/-   ##
==========================================
+ Coverage   68.39%   68.51%   +0.12%     
==========================================
  Files          87       87              
  Lines        5401     5406       +5     
==========================================
+ Hits         3694     3704      +10     
+ Misses       1707     1702       -5     

Flag	Coverage Δ
unit	68.51% <94.73%> (+0.12%)	⬆️

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[efaulhaber]

@LasNikas do you want to take a look as well before this is merged?

[LasNikas]

yes please

[svchb]

@LasNikas Reminder! This waits for over a week now.