Fix bug in test_model_ScalarFunctionConstantNotZero (#1762)

Author: odow

src/Test/test_model.jl

@@ -748,16 +748,18 @@ function test_model_ScalarFunctionConstantNotZero(
     try
         f = MOI.ScalarAffineFunction(MOI.ScalarAffineTerm{T}[], T(1))
         c = MOI.add_constraint(model, f, MOI.EqualTo(T(2)))
-        @requires _supports(config, MOI.ConstraintFunction)
-        @test MOI.get(model, MOI.ConstraintFunction(), c) ≈ f
+        if _supports(config, MOI.ConstraintFunction)
+            @test MOI.get(model, MOI.ConstraintFunction(), c) ≈ f
+        end
     catch err
         @test err == _error(MOI.EqualTo{T}, T(1))
     end
     try
         f = MOI.ScalarAffineFunction(MOI.ScalarAffineTerm{T}[], T(2))
         c = MOI.add_constraint(model, f, MOI.GreaterThan(T(1)))
-        @requires _supports(config, MOI.ConstraintFunction)
-        @test MOI.get(model, MOI.ConstraintFunction(), c) ≈ f
+        if _supports(config, MOI.ConstraintFunction)
+            @test MOI.get(model, MOI.ConstraintFunction(), c) ≈ f
+        end
     catch err
         @test err == _error(MOI.GreaterThan{T}, T(2))
     end

test/Test/Test.jl

@@ -38,6 +38,16 @@ MOI.Test.runtests(
     ],
 )
 
+# Test for Issue #1757
+
+MOI.Test.test_model_ScalarFunctionConstantNotZero(
+    MOI.Utilities.MockOptimizer(
+        MOI.Utilities.Model{Float64}(),
+        scalar_function_constant_non_zero = false,
+    ),
+    MOI.Test.Config(exclude = Any[MOI.ConstraintFunction]),
+)
+
 # Test exclude_tests_after. This should work despite no methods being added for IncompleteOptimizer
 # because every test should get skipped.