diff --git a/src/Test/test_model.jl b/src/Test/test_model.jl
index 4fa013deb4..9f992f4a62 100644
--- a/src/Test/test_model.jl
+++ b/src/Test/test_model.jl
@@ -802,17 +802,16 @@ function test_model_LowerBoundAlreadySet(
     sets = [MOI.EqualTo(lb), MOI.Interval(lb, lb)]
     set2 = MOI.GreaterThan(lb)
     for set1 in sets
-        if !MOI.supports_constraint(model, MOI.VariableIndex, typeof(set1))
-            continue
+        if MOI.supports_constraint(model, MOI.VariableIndex, typeof(set1))
+            ci = MOI.add_constraint(model, x, set1)
+            err = MOI.LowerBoundAlreadySet{typeof(set1),typeof(set2)}(x)
+            @test_throws err MOI.add_constraint(model, x, set2)
+            MOI.delete(model, ci)
+            ci = MOI.add_constraint(model, x, set2)
+            err = MOI.LowerBoundAlreadySet{typeof(set2),typeof(set1)}(x)
+            @test_throws err MOI.add_constraint(model, x, set1)
+            MOI.delete(model, ci)
         end
-        ci = MOI.add_constraint(model, x, set1)
-        err = MOI.LowerBoundAlreadySet{typeof(set1),typeof(set2)}(x)
-        @test_throws err MOI.add_constraint(model, x, set2)
-        MOI.delete(model, ci)
-        ci = MOI.add_constraint(model, x, set2)
-        err = MOI.LowerBoundAlreadySet{typeof(set2),typeof(set1)}(x)
-        @test_throws err MOI.add_constraint(model, x, set1)
-        MOI.delete(model, ci)
     end
     return
 end
@@ -836,17 +835,16 @@ function test_model_UpperBoundAlreadySet(
     sets = [MOI.EqualTo(ub), MOI.Interval(ub, ub)]
     set2 = MOI.LessThan(ub)
     for set1 in sets
-        if !MOI.supports_constraint(model, MOI.VariableIndex, typeof(set1))
-            continue
+        if MOI.supports_constraint(model, MOI.VariableIndex, typeof(set1))
+            ci = MOI.add_constraint(model, x, set1)
+            err = MOI.UpperBoundAlreadySet{typeof(set1),typeof(set2)}(x)
+            @test_throws err MOI.add_constraint(model, x, set2)
+            MOI.delete(model, ci)
+            ci = MOI.add_constraint(model, x, set2)
+            err = MOI.UpperBoundAlreadySet{typeof(set2),typeof(set1)}(x)
+            @test_throws err MOI.add_constraint(model, x, set1)
+            MOI.delete(model, ci)
         end
-        ci = MOI.add_constraint(model, x, set1)
-        err = MOI.UpperBoundAlreadySet{typeof(set1),typeof(set2)}(x)
-        @test_throws err MOI.add_constraint(model, x, set2)
-        MOI.delete(model, ci)
-        ci = MOI.add_constraint(model, x, set2)
-        err = MOI.UpperBoundAlreadySet{typeof(set2),typeof(set1)}(x)
-        @test_throws err MOI.add_constraint(model, x, set1)
-        MOI.delete(model, ci)
     end
     return
 end
diff --git a/src/Test/test_solve.jl b/src/Test/test_solve.jl
index cbd18faec4..281631ecc4 100644
--- a/src/Test/test_solve.jl
+++ b/src/Test/test_solve.jl
@@ -437,9 +437,7 @@ function test_solve_DualStatus_INFEASIBILITY_CERTIFICATE_EqualTo_upper(
     )
     MOI.optimize!(model)
     @test MOI.get(model, MOI.TerminationStatus()) == config.infeasible_status
-    if MOI.get(model, MOI.DualStatus()) != MOI.INFEASIBILITY_CERTIFICATE
-        return
-    end
+    @requires MOI.get(model, MOI.DualStatus()) == MOI.INFEASIBILITY_CERTIFICATE
     clb_dual = MOI.get.(model, MOI.ConstraintDual(), clb)
     c_dual = MOI.get(model, MOI.ConstraintDual(), c)
     @test clb_dual[1] > config.atol
@@ -491,9 +489,7 @@ function test_solve_DualStatus_INFEASIBILITY_CERTIFICATE_EqualTo_lower(
     )
     MOI.optimize!(model)
     @test MOI.get(model, MOI.TerminationStatus()) == config.infeasible_status
-    if MOI.get(model, MOI.DualStatus()) != MOI.INFEASIBILITY_CERTIFICATE
-        return
-    end
+    @requires MOI.get(model, MOI.DualStatus()) == MOI.INFEASIBILITY_CERTIFICATE
     clb_dual = MOI.get.(model, MOI.ConstraintDual(), clb)
     c_dual = MOI.get(model, MOI.ConstraintDual(), c)
     @test clb_dual[1] > config.atol
@@ -544,9 +540,7 @@ function test_solve_DualStatus_INFEASIBILITY_CERTIFICATE_LessThan(
     )
     MOI.optimize!(model)
     @test MOI.get(model, MOI.TerminationStatus()) == config.infeasible_status
-    if MOI.get(model, MOI.DualStatus()) != MOI.INFEASIBILITY_CERTIFICATE
-        return
-    end
+    @requires MOI.get(model, MOI.DualStatus()) == MOI.INFEASIBILITY_CERTIFICATE
     clb_dual = MOI.get.(model, MOI.ConstraintDual(), clb)
     c_dual = MOI.get(model, MOI.ConstraintDual(), c)
     @test clb_dual[1] > config.atol
@@ -598,9 +592,7 @@ function test_solve_DualStatus_INFEASIBILITY_CERTIFICATE_GreaterThan(
     )
     MOI.optimize!(model)
     @test MOI.get(model, MOI.TerminationStatus()) == config.infeasible_status
-    if MOI.get(model, MOI.DualStatus()) != MOI.INFEASIBILITY_CERTIFICATE
-        return
-    end
+    @requires MOI.get(model, MOI.DualStatus()) == MOI.INFEASIBILITY_CERTIFICATE
     clb_dual = MOI.get.(model, MOI.ConstraintDual(), clb)
     c_dual = MOI.get(model, MOI.ConstraintDual(), c)
     @test clb_dual[1] > config.atol
@@ -652,9 +644,7 @@ function test_solve_DualStatus_INFEASIBILITY_CERTIFICATE_Interval_upper(
     )
     MOI.optimize!(model)
     @test MOI.get(model, MOI.TerminationStatus()) == config.infeasible_status
-    if MOI.get(model, MOI.DualStatus()) != MOI.INFEASIBILITY_CERTIFICATE
-        return
-    end
+    @requires MOI.get(model, MOI.DualStatus()) == MOI.INFEASIBILITY_CERTIFICATE
     clb_dual = MOI.get.(model, MOI.ConstraintDual(), clb)
     c_dual = MOI.get(model, MOI.ConstraintDual(), c)
     @test clb_dual[1] > config.atol
@@ -706,9 +696,7 @@ function test_solve_DualStatus_INFEASIBILITY_CERTIFICATE_Interval_lower(
     )
     MOI.optimize!(model)
     @test MOI.get(model, MOI.TerminationStatus()) == config.infeasible_status
-    if MOI.get(model, MOI.DualStatus()) != MOI.INFEASIBILITY_CERTIFICATE
-        return
-    end
+    @requires MOI.get(model, MOI.DualStatus()) == MOI.INFEASIBILITY_CERTIFICATE
     clb_dual = MOI.get.(model, MOI.ConstraintDual(), clb)
     c_dual = MOI.get(model, MOI.ConstraintDual(), c)
     @test clb_dual[1] > config.atol
@@ -760,9 +748,7 @@ function test_solve_DualStatus_INFEASIBILITY_CERTIFICATE_VariableIndex_LessThan(
     )
     MOI.optimize!(model)
     @test MOI.get(model, MOI.TerminationStatus()) == config.infeasible_status
-    if MOI.get(model, MOI.DualStatus()) != MOI.INFEASIBILITY_CERTIFICATE
-        return
-    end
+    @requires MOI.get(model, MOI.DualStatus()) == MOI.INFEASIBILITY_CERTIFICATE
     clb_dual = MOI.get.(model, MOI.ConstraintDual(), clb)
     c_dual = MOI.get(model, MOI.ConstraintDual(), c)
     @test clb_dual[1] < -config.atol
@@ -818,9 +804,7 @@ function test_solve_DualStatus_INFEASIBILITY_CERTIFICATE_VariableIndex_LessThan_
     MOI.set(model, MOI.ObjectiveFunction{MOI.VariableIndex}(), x[1])
     MOI.optimize!(model)
     @test MOI.get(model, MOI.TerminationStatus()) == config.infeasible_status
-    if MOI.get(model, MOI.DualStatus()) != MOI.INFEASIBILITY_CERTIFICATE
-        return
-    end
+    @requires MOI.get(model, MOI.DualStatus()) == MOI.INFEASIBILITY_CERTIFICATE
     clb_dual = MOI.get.(model, MOI.ConstraintDual(), clb)
     c_dual = MOI.get(model, MOI.ConstraintDual(), c)
     @test clb_dual[1] < -config.atol
diff --git a/test/Utilities/mockoptimizer.jl b/test/Utilities/mockoptimizer.jl
index 0c1f0f2848..c7f76b8cc2 100644
--- a/test/Utilities/mockoptimizer.jl
+++ b/test/Utilities/mockoptimizer.jl
@@ -241,6 +241,23 @@ function test_delete_allowed_false()
     return
 end
 
+function test_modify_not_allowed()
+    model = MOI.Utilities.MockOptimizer(MOI.Utilities.Model{Float64}())
+    config = MOI.Test.Config(
+        exclude = Any[MOI.ScalarCoefficientChange, MOI.VectorConstantChange],
+    )
+    MOI.Test.runtests(
+        model,
+        config,
+        include = [
+            r"$test_linear_integration^",
+            r"$test_linear_integration_modification^",
+            r"$test_linear_VectorAffineFunction^",
+        ],
+    )
+    return
+end
+
 end  # module
 
 TestMockOptimizer.runtests()