public virtual void CreateAllRenderersTest()
        {
            DefaultSvgNodeRendererMapper mapper = new DefaultSvgNodeRendererMapper();

            foreach (Type rendererClazz in mapper.GetMapping().Values)
            {
                // the test is that this method does not throw an exception on any class here
                // meaning that every (non-abstract) implementation must have a public no-args constructor
                System.Activator.CreateInstance(rendererClazz);
            }
        }
        public virtual void MapperNotEmptyTest()
        {
            DefaultSvgNodeRendererMapper mapper = new DefaultSvgNodeRendererMapper();

            NUnit.Framework.Assert.IsFalse(mapper.GetMapping().IsEmpty());
        }