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

            public void HandlesCollectionChangesByResetCorrectly()
            {
                var collection = new FastObservableCollection<TestModel>();
                var wrapper = new ChangeNotificationWrapper(collection);

                var itemsReset = false;
                var itemsAdded = false;
                var itemsRemoved = false;

                var model = new TestModel();
                collection.Add(model);

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

                    if (e.Action == NotifyCollectionChangedAction.Reset)
                    {
                        itemsReset = true;
                    }

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

                using (collection.SuspendChangeNotifications())
                {
                    ((ICollection<TestModel>)collection).ReplaceRange(new [] { new TestModel() });
                }

                Assert.IsFalse(itemsAdded);
                Assert.IsFalse(itemsRemoved);
                Assert.IsTrue(itemsReset);
            }