Refactor test/constraints.jl

[odow]

Extracted from #2277

[codecov]

Codecov Report

Merging #2306 into master will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2306      +/-   ##
==========================================
- Coverage   91.38%   91.37%   -0.02%     
==========================================
  Files          42       42              
  Lines        4250     4255       +5     
==========================================
+ Hits         3884     3888       +4     
- Misses        366      367       +1     

Impacted Files	Coverage Δ
src/constraints.jl	90.37% <0.00%> (-0.75%)	⬇️
src/variables.jl	97.61% <0.00%> (+0.04%)	⬆️

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