Add some basic tests for the Voigt module

[smokestacklightnin]

:pencil: Description

Type: :vertical_traffic_light: testing

This pull request adds a few basic tests to the opacities.voigt module. The tests are parametrized to test several input values and also include tests to raise errors when a division by zero is attempted.

:pushpin: Resources

How to parametrize pytest fixtures and test functions

Examples for parametrized test functions

:vertical_traffic_light: Testing

How did you test these changes?

• [X] Testing pipeline
• [X] Tested locally

:ballot_box_with_check: Checklist

• [x] I requested two reviewers for this pull request
• [ ] I updated the documentation according to my changes
• [ ] I built the documentation by applying the build_docs label

[codecov[bot]]

Codecov Report

Merging #94 (bcc07c5) into main (0b48514) will increase coverage by 1.54%. Report is 9 commits behind head on main. The diff coverage is 76.66%.

:exclamation: Current head bcc07c5 differs from pull request most recent head 0dce29b. Consider uploading reports for the commit 0dce29b to get more accurate results

@@            Coverage Diff             @@
##             main      #94      +/-   ##
==========================================
+ Coverage   33.44%   34.99%   +1.54%     
==========================================
  Files          15       16       +1     
  Lines         592      623      +31     
==========================================
+ Hits          198      218      +20     
- Misses        394      405      +11     

Files Changed	Coverage Δ
stardis/plasma/base.py	43.93% <0.00%> (ø)
stardis/transport/base.py	25.49% <0.00%> (ø)
stardis/model/base.py	16.27% <33.33%> (+0.89%)	:arrow_up:
stardis/model/geometry/radial1d.py	66.66% <66.66%> (ø)
stardis/io/model/marcs.py	90.76% <75.00%> (-9.24%)	:arrow_down:
stardis/io/model/tests/test_model_io.py	100.00% <100.00%> (ø)

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