more major fixes for #7 and more tests

[gebv]

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[codecov-commenter]

Codecov Report

Merging #10 (80e8360) into master (c2741d7) will increase coverage by 0.17%.
The diff coverage is 78.26%.

@@            Coverage Diff             @@
##           master      #10      +/-   ##
==========================================
+ Coverage   80.40%   80.57%   +0.17%     
==========================================
  Files           8        8              
  Lines         398      417      +19     
==========================================
+ Hits          320      336      +16     
- Misses         64       66       +2     
- Partials       14       15       +1     

Flag	Coverage Δ
unittests	80.57% <78.26%> (+0.17%)	⬆️

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Impacted Files	Coverage Δ
store.go	90.09% <78.26%> (-3.39%)	⬇️
rand.go	100.00% <0.00%> (+22.22%)	⬆️

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