snow test

[mrke]

add snow test ready for comparison with snow model

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.59%. Comparing base (49490fd) to head (7e1b9f8).
⚠️ Report is 7 commits behind head on performance-changes.

Additional details and impacted files

@@                   Coverage Diff                   @@
##           performance-changes      #84      +/-   ##
=======================================================
- Coverage                91.60%   91.59%   -0.01%     
=======================================================
  Files                        8        8              
  Lines                      977      976       -1     
=======================================================
- Hits                       895      894       -1     
  Misses                      82       82              

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