Update runtests.jl (#376)

* Update runtests.jl

* Update test/runtests.jl

Co-authored-by: Tangi Migot <tangi.migot@gmail.com>

---------

Co-authored-by: Tangi Migot <tangi.migot@gmail.com>

Author: arnavk23

test/runtests.jl

@@ -4,7 +4,7 @@ using NLPModels, NLPModelsJuMP, OptimizationProblems, Test
 
 import ADNLPModels
 
-list_problems = intersect(names(ADNLPProblems), names(PureJuMP))
+const list_problems = intersect(names(ADNLPProblems), names(PureJuMP))
 # all problems have a JuMP and ADNLPModels formulations
 @test setdiff(union(names(ADNLPProblems), names(PureJuMP)), list_problems) ==
       [:ADNLPProblems, :PureJuMP]