From a024e3f31d495af0d05835052bb57cd0a4b280a5 Mon Sep 17 00:00:00 2001
From: joaquimg <joaquimg@users.noreply.github.com>
Date: Sun, 15 Mar 2026 17:45:08 -0300
Subject: [PATCH 1/2] More units tests

---
 test/test_MathOptInterface.jl | 58 ++++++++++++++++++++++++++++-------
 1 file changed, 47 insertions(+), 11 deletions(-)

diff --git a/test/test_MathOptInterface.jl b/test/test_MathOptInterface.jl
index 2e9dccd..dcda270 100644
--- a/test/test_MathOptInterface.jl
+++ b/test/test_MathOptInterface.jl
@@ -377,9 +377,13 @@ function test_moi_ListOfConstraintTypesPresent()
     model = POI.Optimizer(ipopt)
     MOI.set(model, MOI.Silent(), true)
     x = MOI.add_variables(model, N / 2)
-    y = first.(
-        MOI.add_constrained_variable.(model, MOI.Parameter.(ones(Int(N / 2)))),
-    )
+    y =
+        first.(
+            MOI.add_constrained_variable.(
+                model,
+                MOI.Parameter.(ones(Int(N / 2))),
+            ),
+        )
 
     MOI.add_constraint(
         model,
@@ -673,10 +677,11 @@ function test_vector_parameter_affine_nonnegatives()
     t, ct = MOI.add_constrained_variable(model, MOI.Parameter(5.0))
     A = [1.0 0 -1; 0 1 -1]
     b = [1.0; 2]
-    terms = MOI.VectorAffineTerm.(
-        1:2,
-        MOI.ScalarAffineTerm.(A, reshape([x, y, t], 1, 3)),
-    )
+    terms =
+        MOI.VectorAffineTerm.(
+            1:2,
+            MOI.ScalarAffineTerm.(A, reshape([x, y, t], 1, 3)),
+        )
     f = MOI.VectorAffineFunction(vec(terms), b)
     set = MOI.Nonnegatives(2)
     cnn = MOI.add_constraint(model, f, MOI.Nonnegatives(2))
@@ -725,10 +730,11 @@ function test_vector_parameter_affine_nonpositives()
     t, ct = MOI.add_constrained_variable(model, MOI.Parameter(5.0))
     A = [-1.0 0 1; 0 -1 1]
     b = [-1.0; -2]
-    terms = MOI.VectorAffineTerm.(
-        1:2,
-        MOI.ScalarAffineTerm.(A, reshape([x, y, t], 1, 3)),
-    )
+    terms =
+        MOI.VectorAffineTerm.(
+            1:2,
+            MOI.ScalarAffineTerm.(A, reshape([x, y, t], 1, 3)),
+        )
     f = MOI.VectorAffineFunction(vec(terms), b)
     set = MOI.Nonnegatives(2)
     cnn = MOI.add_constraint(model, f, MOI.Nonpositives(2))
@@ -2524,6 +2530,36 @@ function test_vector_quadratic_no_parameters_affine_get_constraint_function()
     return
 end
 
+function test_delete_variable_errors()
+    model = POI.Optimizer(MOI.Utilities.Model{Float64}())
+    p, _ = MOI.add_constrained_variable(model, MOI.Parameter(1.0))
+    @test_throws(
+        ErrorException("Cannot delete parameters in ParametricOptInterface."),
+        MOI.delete(model, p),
+    )
+    @test_throws MOI.InvalidIndex MOI.delete(model, MOI.VariableIndex(999999))
+    return
+end
+
+function test_parameter_only_affine_objective()
+    # Objective with only parameter terms (no decision variable terms).
+    # This tests MOI.ScalarConstantChange in isolation.
+    model = POI.Optimizer(HiGHS.Optimizer)
+    MOI.set(model, MOI.Silent(), true)
+    x = MOI.add_variable(model)
+    MOI.add_constraint(model, x, MOI.GreaterThan(0.0))
+    p, pc = MOI.add_constrained_variable(model, MOI.Parameter(3.0))
+    f = MOI.ScalarAffineFunction([MOI.ScalarAffineTerm(2.0, p)], 1.0)
+    MOI.set(model, MOI.ObjectiveFunction{typeof(f)}(), f)
+    MOI.set(model, MOI.ObjectiveSense(), MOI.MIN_SENSE)
+    MOI.optimize!(model)
+    @test MOI.get(model, MOI.ObjectiveValue()) ≈ 7.0  # 2*3 + 1
+    MOI.set(model, MOI.ConstraintSet(), pc, MOI.Parameter(5.0))
+    MOI.optimize!(model)
+    @test MOI.get(model, MOI.ObjectiveValue()) ≈ 11.0  # 2*5 + 1
+    return
+end
+
 end # module
 
 TestMathOptInterfaceTests.runtests()

From ade1867995986fc3a55475728273db38f1906e98 Mon Sep 17 00:00:00 2001
From: joaquimg <joaquimg@users.noreply.github.com>
Date: Sun, 15 Mar 2026 17:47:10 -0300
Subject: [PATCH 2/2] fmt

---
 test/test_MathOptInterface.jl | 28 +++++++++++-----------------
 1 file changed, 11 insertions(+), 17 deletions(-)

diff --git a/test/test_MathOptInterface.jl b/test/test_MathOptInterface.jl
index dcda270..c82dc0e 100644
--- a/test/test_MathOptInterface.jl
+++ b/test/test_MathOptInterface.jl
@@ -377,13 +377,9 @@ function test_moi_ListOfConstraintTypesPresent()
     model = POI.Optimizer(ipopt)
     MOI.set(model, MOI.Silent(), true)
     x = MOI.add_variables(model, N / 2)
-    y =
-        first.(
-            MOI.add_constrained_variable.(
-                model,
-                MOI.Parameter.(ones(Int(N / 2))),
-            ),
-        )
+    y = first.(
+        MOI.add_constrained_variable.(model, MOI.Parameter.(ones(Int(N / 2)))),
+    )
 
     MOI.add_constraint(
         model,
@@ -677,11 +673,10 @@ function test_vector_parameter_affine_nonnegatives()
     t, ct = MOI.add_constrained_variable(model, MOI.Parameter(5.0))
     A = [1.0 0 -1; 0 1 -1]
     b = [1.0; 2]
-    terms =
-        MOI.VectorAffineTerm.(
-            1:2,
-            MOI.ScalarAffineTerm.(A, reshape([x, y, t], 1, 3)),
-        )
+    terms = MOI.VectorAffineTerm.(
+        1:2,
+        MOI.ScalarAffineTerm.(A, reshape([x, y, t], 1, 3)),
+    )
     f = MOI.VectorAffineFunction(vec(terms), b)
     set = MOI.Nonnegatives(2)
     cnn = MOI.add_constraint(model, f, MOI.Nonnegatives(2))
@@ -730,11 +725,10 @@ function test_vector_parameter_affine_nonpositives()
     t, ct = MOI.add_constrained_variable(model, MOI.Parameter(5.0))
     A = [-1.0 0 1; 0 -1 1]
     b = [-1.0; -2]
-    terms =
-        MOI.VectorAffineTerm.(
-            1:2,
-            MOI.ScalarAffineTerm.(A, reshape([x, y, t], 1, 3)),
-        )
+    terms = MOI.VectorAffineTerm.(
+        1:2,
+        MOI.ScalarAffineTerm.(A, reshape([x, y, t], 1, 3)),
+    )
     f = MOI.VectorAffineFunction(vec(terms), b)
     set = MOI.Nonnegatives(2)
     cnn = MOI.add_constraint(model, f, MOI.Nonpositives(2))