add Test coverage

[HashEngineering]

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[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (master@dd43a29). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master       #1   +/-   ##
=========================================
  Coverage          ?   38.92%           
  Complexity        ?      131           
=========================================
  Files             ?       25           
  Lines             ?      691           
  Branches          ?       62           
=========================================
  Hits              ?      269           
  Misses            ?      370           
  Partials          ?       52           

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