Catel.Test.Data.ChangeNotificationWrapperFacts.TheCollectionChangesLogic.HandlesCollectionChangesCorrectly C# (CSharp) Метод

            public void HandlesCollectionChangesCorrectly()
            {
                var collection = new ObservableCollection<TestModel>();
                var wrapper = new ChangeNotificationWrapper(collection);

                bool itemsAdded = false;
                bool itemsRemoved = false;

                wrapper.CollectionChanged += (sender, e) =>
                {
                    if (e.OldItems != null)
                    {
                        itemsRemoved = true;
                    }

                    if (e.NewItems != null)
                    {
                        itemsAdded = true;
                    }
                };

                var model = new TestModel();
                collection.Add(model);
                Assert.IsTrue(itemsAdded);
                Assert.IsFalse(itemsRemoved);

                collection.Remove(model);
                Assert.IsTrue(itemsRemoved);
            }