Tests for the reducer function

[ujh]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.60%. Comparing base (1cb6b5f) to head (bb17e2f).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2156      +/-   ##
==========================================
+ Coverage   71.73%   72.60%   +0.87%     
==========================================
  Files         236      236              
  Lines        4019     4019              
  Branches      156      156              
==========================================
+ Hits         2883     2918      +35     
+ Misses       1118     1083      -35     
  Partials       18       18              

Flag	Coverage Δ
javascript	59.37% <100.00%> (+2.44%)	⬆️
ruby	79.91% <ø> (ø)

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