public void Should_write_the_components()
        {
            var classMapping = new JoinedSubclassMapping();
            classMapping.AddComponent(new ComponentMapping());

            _mocker.Get<IHbmWriter<ComponentMapping>>()
                .Expect(x => x.Write(classMapping.Components.First())).Return(new HbmComponent());

            _subclassWriter.VerifyXml(classMapping)
                .Element("component").Exists();
        }