Increase code coverage

[DilumAluthge]

No description provided.

[codecov]

Codecov Report

Merging #3 into master will increase coverage by 37.64%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           master       #3       +/-   ##
===========================================
+ Coverage   60.86%   98.51%   +37.64%     
===========================================
  Files          11       10        -1     
  Lines         230      202       -28     
===========================================
+ Hits          140      199       +59     
+ Misses         90        3       -87     

Impacted Files	Coverage Δ
src/PharmaceuticalClassification.jl	100.00% <ø> (ø)
src/build.jl	100.00% <ø> (+8.51%)	⬆️
src/edge.jl	100.00% <ø> (+53.33%)	⬆️
src/iterate.jl	100.00% <ø> (+33.33%)	⬆️
src/system.jl	100.00% <100.00%> (ø)
src/traversal.jl	100.00% <100.00%> (+52.94%)	⬆️
src/vertex.jl	100.00% <0.00%> (+37.50%)	⬆️
src/types.jl	70.00% <0.00%> (+42.72%)	⬆️
... and 2 more

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