Test with an actual NetCDF file

[tomchor]

Adds a script to plot a NetCDF file, stores that file in the repo, and update tests to actually read that file and test that everything works correctly.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.33%. Comparing base (0432624) to head (f008f0e).
Report is 1 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main       #8       +/-   ##
===========================================
+ Coverage   77.14%   93.33%   +16.19%     
===========================================
  Files           4        4               
  Lines         105      105               
===========================================
+ Hits           81       98       +17     
+ Misses         24        7       -17     

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