- fix validation of open generic type registrations without parameter constraints

LightweightIocContainer.Validation/IocValidator.cs

@@ -68,8 +68,13 @@ public class IocValidator(IocContainer iocContainer)
             foreach (Type genericArgument in genericArguments.Where(g => g.IsGenericParameter))
             {
                 Type[] genericParameterConstraints = genericArgument.GetGenericParameterConstraints();
-                object mock = Substitute.For(genericParameterConstraints, []);
-                genericParameters.Add(mock.GetType());
+                if (genericParameterConstraints.Any())
+                {
+                    object mock = Substitute.For(genericParameterConstraints, []);
+                    genericParameters.Add(mock.GetType());
+                }
+                else
+                    genericParameters.Add(typeof(object));
             }
 
             type = type.MakeGenericType(genericParameters.ToArray());

Test.LightweightIocContainer.Validation/IocValidatorTest.cs

@@ -41,6 +41,12 @@ public class IocValidatorTest
     [UsedImplicitly]
     public class GenericTest<T> : IGenericTest<T> where T : IConstraint, new();
     
+    [UsedImplicitly]
+    public interface IGenericTestWithoutConstraint<T>;
+    
+    [UsedImplicitly]
+    public class GenericTestWithoutConstraint<T> : IGenericTestWithoutConstraint<T>;
+    
     [UsedImplicitly]
     public interface IGenericTestFactory
     {
@@ -59,6 +65,15 @@ public class IocValidatorTest
         }
     }
     
+    [UsedImplicitly]
+    public class GenericParameterWithoutConstraint : IGenericParameter
+    {
+        public GenericParameterWithoutConstraint(IGenericTestWithoutConstraint<IParameter> test)
+        {
+            
+        }
+    }
+
     [UsedImplicitly]
     private class TestViewModelDontIgnoreDesignTimeCtor : ITest
     {
@@ -322,6 +337,17 @@ public class IocValidatorTest
         validator.Validate();
     }
     
+    [Test]
+    public void TestValidateOpenGenericTypeWithoutConstraintAsParameter()
+    {
+        IocContainer iocContainer = new();
+        iocContainer.Register(r => r.AddOpenGenerics(typeof(IGenericTestWithoutConstraint<>), typeof(GenericTestWithoutConstraint<>)));
+        iocContainer.Register(r => r.Add<IGenericParameter, GenericParameterWithoutConstraint>());
+
+        IocValidator validator = new(iocContainer);
+        validator.Validate();
+    }
+
     private void AssertNoMatchingConstructorFoundForType<T>(AggregateException aggregateException)
     {
         Exception exception = aggregateException?.InnerExceptions[0];