Test RAT v3

[ChrisRackauckas]

Checklist

• Appropriate tests were added
• Any code changes were done in a way that does not break public API
• All documentation related to code changes were updated
• The new code follows the
  contributor guidelines, in particular the SciML Style Guide and
  COLPRAC.
• Any new documentation only uses public API

Additional context

Add any other context about the problem here.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (735b5a9) 26.36% compared to head (a5644f9) 26.31%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #59      +/-   ##
==========================================
- Coverage   26.36%   26.31%   -0.06%     
==========================================
  Files           8        8              
  Lines        1995     1995              
==========================================
- Hits          526      525       -1     
- Misses       1469     1470       +1     

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