Добавлены тесты и покрытие

[maksimepikhin]

Изменена среда тестирования

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (stable@73065f6). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             stable        #2   +/-   ##
==========================================
  Coverage          ?   100.00%           
  Complexity        ?         7           
==========================================
  Files             ?         1           
  Lines             ?        15           
  Branches          ?         0           
==========================================
  Hits              ?        15           
  Misses            ?         0           
  Partials          ?         0           

Flag	Coverage Δ
unittests	100.00% <0.00%> (?)

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