Fix test fields

[mrp089]

Current situation

Closes #173.

Release Notes

• fix test loop to run ALL fields (and report errors for all individually)
• reran ALL test cases
• tightened tolerances as much as possible (had to change some linear solvers from NS to GMRES)
• limited max number of nonlinear steps to the current converged one
• adapted tolerances for ALL fields we test to the tightest ones with which all tests still pass

Documentation

Added testing guide #195

Testing

• tests still pass
• and importantly: didn't pass before adapting the tolerances

Code of Conduct & Contributing Guidelines

• I agree to follow the Code of Conduct and Contributing Guidelines.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 57.70%. Comparing base (6c60ff7) to head (9071ad9).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #175      +/-   ##
==========================================
+ Coverage   57.50%   57.70%   +0.20%     
==========================================
  Files         103      103              
  Lines       26964    26964              
==========================================
+ Hits        15505    15560      +55     
+ Misses      11459    11404      -55     

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[mrp089]

@MatteoSalvador, I would merge this one first, and then I'll fix the conflicts in #174 and #188

[MatteoSalvador]

Thank you very much @mrp089, really nice job (as always)!

Before merging, I would only make sure that the .inp files perfectly match the .xml for all the test cases, for reproducibility reasons. I saw that sometimes tolerances and other settings have not been updated accordingly.

[mrp089]

You mean .inp from FORTRAN svFSI? I tried deleting the remaining ones I found so there are no duplicates.

[MatteoSalvador]

Thanks @mrp089! Following up on our conversation this afternoon, it is probably better to remove the .inp files from all the test cases and stick with .xml files only.