public void CopyPasteBlock()
        {
            var initContextDesc = VFXLibrary.GetContexts().Where(t => t.name == "Initialize").First();

            var newContext = m_ViewController.AddVFXContext(new Vector2(100, 100), initContextDesc);

            m_ViewController.ApplyChanges();
            Assert.AreEqual(m_ViewController.allChildren.Where(t => t is VFXContextController).Count(), 1);

            var contextController = m_ViewController.allChildren.OfType <VFXContextController>().First();

            Assert.AreEqual(contextController.model, newContext);

            var flipBookBlockDesc = VFXLibrary.GetBlocks().First(t => t.name == "Set Tex Index ");

            contextController.AddBlock(0, flipBookBlockDesc.CreateInstance());

            var newBlock = contextController.model.children.First();

            m_ViewController.ApplyChanges();

            VFXViewWindow window = EditorWindow.GetWindow <VFXViewWindow>();

            VFXView view = window.graphView;

            view.controller = m_ViewController;

            view.ClearSelection();
            foreach (var element in view.Query().OfType <VFXBlockUI>().ToList().OfType <ISelectable>())
            {
                view.AddToSelection(element);
            }

            VFXBlock flipBookBlock = m_ViewController.contexts.First().blockControllers.First().model;
            VFXSlot  minValueSlot  = flipBookBlock.GetInputSlot(0);

            float originalMinValue = 123.456f;

            minValueSlot.value = originalMinValue;

            view.CopySelectionCallback();

            minValueSlot.value = 789f;

            view.PasteCallback();

            view.controller.ApplyChanges();

            var elements = view.Query().OfType <VFXBlockUI>().ToList();

            var copyBlock = elements.Select(t => t.controller).First(t => t.model != newBlock).model;

            var copyMinSlot = copyBlock.GetInputSlot(0);

            Assert.AreEqual((float)copyMinSlot.value, originalMinValue);
        }
        public void CopyPasteContextWithBlock()
        {
            var initContextDesc = VFXLibrary.GetContexts().Where(t => t.name == "Initialize").First();

            var newContext = m_ViewController.AddVFXContext(new Vector2(100, 100), initContextDesc);

            m_ViewController.ApplyChanges();

            Assert.AreEqual(m_ViewController.allChildren.Where(t => t is VFXContextController).Count(), 1);

            var contextController = m_ViewController.allChildren.OfType <VFXContextController>().First();

            Assert.AreEqual(contextController.model, newContext);

            var flipBookBlockDesc = VFXLibrary.GetBlocks().First(t => t.name == "Set Tex Index ");

            contextController.AddBlock(0, flipBookBlockDesc.CreateInstance());

            m_ViewController.ApplyChanges();

            VFXViewWindow window = EditorWindow.GetWindow <VFXViewWindow>();

            VFXView view = window.graphView;

            view.controller = m_ViewController;

            view.ClearSelection();
            foreach (var element in view.Query().OfType <GraphElement>().ToList().OfType <ISelectable>())
            {
                view.AddToSelection(element);
            }

            VFXSlot boundsSlot = newContext.GetInputSlot(0);

            AABox originalBounds = new AABox()
            {
                center = Vector3.one, size = Vector3.one * 10
            };

            boundsSlot.value = originalBounds;

            VFXBlock flipBookBlock = m_ViewController.contexts.First().blockControllers.First().model;
            VFXSlot  minValueSlot  = flipBookBlock.GetInputSlot(0);


            float originalMinValue = 123.456f;

            minValueSlot.value = originalMinValue;

            view.CopySelectionCallback();

            boundsSlot.value = new AABox()
            {
                center = Vector3.zero, size = Vector3.zero
            };
            minValueSlot.value = 789f;

            view.PasteCallback();
            var elements = view.Query().OfType <GraphElement>().ToList();

            var contexts    = elements.OfType <VFXContextUI>().ToArray();
            var copyContext = elements.OfType <VFXContextUI>().Select(t => t.controller).First(t => t.model != newContext).model;

            var copyBoundsSlot = copyContext.GetInputSlot(0);
            var copyMinSlot    = copyContext[0].GetInputSlot(0);

            Assert.AreEqual((AABox)copyBoundsSlot.value, originalBounds);
            Assert.AreEqual((float)copyMinSlot.value, originalMinValue);
            Assert.AreNotEqual(copyContext.position, newContext.position);


            view.PasteCallback();

            elements = view.Query().OfType <GraphElement>().ToList();
            contexts = elements.OfType <VFXContextUI>().ToArray();

            var copy2Context = contexts.First(t => t.controller.model != newContext && t.controller.model != copyContext).controller.model;

            Assert.AreNotEqual(copy2Context.position, newContext.position);
            Assert.AreNotEqual(copy2Context.position, copyContext.position);
        }