add tests for statistics calculations

[giovanni-guidini]

No description provided.

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +3.37% 🎉

Comparison is base (1598ac6) 70.13% compared to head (4e5c604) 73.50%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #15      +/-   ##
==========================================
+ Coverage   70.13%   73.50%   +3.37%     
==========================================
  Files          28       26       -2     
  Lines         750      755       +5     
==========================================
+ Hits          526      555      +29     
+ Misses        224      200      -24     

Flag	Coverage Δ
smart-tests	73.50% <100.00%> (+3.37%)	⬆️

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Files Changed	Coverage Δ
services/process_data/__init__.py	22.01% <100.00%> (+22.01%)	⬆️
services/process_data/tests/test_process_data.py	100.00% <100.00%> (ø)

... and 3 files with indirect coverage changes

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