Use SingleVariable as objective function in a test.

[tkoolen]

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[codecov-io]

Codecov Report

Merging #244 into master will increase coverage by 0.01%.
The diff coverage is 37.93%.

@@            Coverage Diff             @@
##           master     #244      +/-   ##
==========================================
+ Coverage   59.17%   59.18%   +0.01%     
==========================================
  Files          23       23              
  Lines        3559     3560       +1     
==========================================
+ Hits         2106     2107       +1     
  Misses       1453     1453

Impacted Files	Coverage Δ
src/Test/contlinear.jl	55.14% <37.93%> (+0.05%)	⬆️

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[joaquimg]

I think this test shouldn´t be in linear1test.

Having it in a new test function would be good. We can start doing the smaller tests: #224 (comment)

Many MOI implementations might choose not to allow it.