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[FileFormats.MPS] test that duplicate entries are summed #2787

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Merged
merged 1 commit into from
Jul 20, 2025
Merged

[FileFormats.MPS] test that duplicate entries are summed #2787

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14 changes: 14 additions & 0 deletions test/FileFormats/MPS/MPS.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -1661,6 +1661,20 @@ function test_obj_constant_max_to_max()
return
end

function test_duplicate_coefficient()
model = MPS.Model()
MOI.read_from_file(model, joinpath(@__DIR__, "duplicate_coefficient.mps"))
dest = MOI.Utilities.Model{Float64}()
MOI.copy_to(dest, model)
F, S = MOI.ScalarAffineFunction{Float64}, MOI.EqualTo{Float64}
x = only(MOI.get(dest, MOI.ListOfVariableIndices()))
c = only(MOI.get(dest, MOI.ListOfConstraintIndices{F,S}()))
f = MOI.get(dest, MOI.ConstraintFunction(), c)
@test isapprox(f, 2.0 * x)
@test MOI.get(dest, MOI.ConstraintSet(), c) == MOI.EqualTo(1.0)
return
end

end # TestMPS

TestMPS.runtests()
13 changes: 13 additions & 0 deletions test/FileFormats/MPS/duplicate_coefficient.mps
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Original file line number Diff line number Diff line change
@@ -0,0 +1,13 @@
NAME DUPLICATE_COEFFICIENT
ROWS
N obj
E c
COLUMNS
x obj 1
x c 1
x c 1
RHS
rhs c 1
BOUNDS
FR bounds x
ENDATA
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