658 add simple tests

[ReDBrother]

#658

[codecov-io]

Codecov Report

Merging #676 into master will not change coverage by %.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #676   +/-   ##
=======================================
  Coverage   80.47%   80.47%           
=======================================
  Files          79       79           
  Lines        1311     1311           
=======================================
  Hits         1055     1055           
  Misses        256      256           

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