Added tests for reducing statistics

[jorgecarleitao]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 80.55556% with 7 lines in your changes missing coverage. Please review.

Project coverage is 71.77%. Comparing base (9f95ce6) to head (970031f).
Report is 90 commits behind head on main.

Files with missing lines	Patch %	Lines
src/write/statistics.rs	80.55%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #116      +/-   ##
==========================================
+ Coverage   70.04%   71.77%   +1.72%     
==========================================
  Files          77       77              
  Lines        3322     3298      -24     
==========================================
+ Hits         2327     2367      +40     
+ Misses        995      931      -64     

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