InternalUnmanagedType internalImpl = proxyClassInternal.newInstance(state, typeConverter, unmanagedInstance)

        then:
        unmanagedInstance.unmanagedValue == "Lajos"

        when:
        internalImpl.unmanagedValue = "Geza"
        then:
        unmanagedInstance.unmanagedValue == "Geza"

        expect:
        internalImpl.add(2, 3) == 5

        when:

            modelNode.addReference(name, target.getManagedType(), target.getBackingNode(), descriptor);
        } else {
            modelNode.addLink(
                ModelRegistrations.unmanagedInstance(
                    ModelReference.of(modelNode.getPath().child(name), type),
                    Factories.constant(instance)
                )
                .descriptor(descriptor)
                .build()