Refactor shared test utilities

[apriha]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 68.75000% with 25 lines in your changes missing coverage. Please review.
✅ Project coverage is 92.78%. Comparing base (f860a33) to head (4f0e47e).
⚠️ Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
src/snps/testing.py	68.75%	15 Missing and 10 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #199      +/-   ##
==========================================
- Coverage   93.71%   92.78%   -0.94%     
==========================================
  Files          11       12       +1     
  Lines        2067     2147      +80     
  Branches      331      344      +13     
==========================================
+ Hits         1937     1992      +55     
- Misses         74       89      +15     
- Partials       56       66      +10     

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