Add tests for min(x, y) and max(x, y)

[odow]

Closes #39

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.07% 🎉

Comparison is base (a85f1a5) 95.64% compared to head (b498c1b) 95.71%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #42      +/-   ##
==========================================
+ Coverage   95.64%   95.71%   +0.07%     
==========================================
  Files         180      184       +4     
  Lines        2042     2078      +36     
==========================================
+ Hits         1953     1989      +36     
  Misses         89       89              

Files Changed	Coverage Δ
src/nlp-expr/009_010.jl	100.00% <100.00%> (ø)
src/nlp-expr/009_011.jl	100.00% <100.00%> (ø)
src/nlp/009_010.jl	100.00% <100.00%> (ø)
src/nlp/009_011.jl	100.00% <100.00%> (ø)

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[ccoffrin]

I like the test. Is support for min/max only in the new NL interface? Should these be added in the @nl tests as well?

[odow]

There should be support for the old interface. But I didn't add tests because I figured we'll deprecate it at some point. I can add though

[ccoffrin]

LGTM