add unit tests

[ubogdan]

No description provided.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@01d66cd). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             master       #12   +/-   ##
==========================================
  Coverage          ?   100.00%           
==========================================
  Files             ?         1           
  Lines             ?        28           
  Branches          ?         0           
==========================================
  Hits              ?        28           
  Misses            ?         0           
  Partials          ?         0           

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