More flexible testing of array representation

[giordano]

Fix #60.

[codecov-io]

Codecov Report

Merging #61 into master will increase coverage by 0.11%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #61      +/-   ##
==========================================
+ Coverage   96.32%   96.43%   +0.11%     
==========================================
  Files          12       12              
  Lines         544      561      +17     
==========================================
+ Hits          524      541      +17     
  Misses         20       20

Impacted Files	Coverage Δ
src/special-functions.jl	100% <ø> (ø)	⬆️
src/plot-recipes.jl	100% <ø> (ø)	⬆️
src/show.jl	72.72% <ø> (ø)	⬆️
src/unitful.jl	100% <ø> (ø)	⬆️
src/quadgk.jl	100% <ø> (ø)	⬆️
src/utils.jl	100% <0%> (ø)	⬆️
src/conversions.jl	87.5% <0%> (+0.83%)	⬆️

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