improve unit tests

[hmdsefi]

No description provided.

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +22.60 🎉

Comparison is base (74fedbf) 69.97% compared to head (669fac4) 92.58%.

Additional details and impacted files

@@             Coverage Diff             @@
##           master      #23       +/-   ##
===========================================
+ Coverage   69.97%   92.58%   +22.60%     
===========================================
  Files           8        8               
  Lines         443      445        +2     
===========================================
+ Hits          310      412      +102     
+ Misses        117       25       -92     
+ Partials       16        8        -8     

Flag	Coverage Δ
unittests	92.58% <100.00%> (+22.60%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
graph.go	100.00% <100.00%> (+65.78%)	⬆️
base.go	86.58% <0.00%> (+15.58%)	⬆️
traverse/df_iterator.go	100.00% <0.00%> (+16.66%)	⬆️
traverse/bf_iterator.go	100.00% <0.00%> (+20.51%)	⬆️
traverse/topological_iterator.go	93.93% <0.00%> (+27.27%)	⬆️
properties.go	100.00% <0.00%> (+44.44%)	⬆️
graph_types.go	100.00% <0.00%> (+66.66%)	⬆️

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