public async Task ShouldRaiseCollectionChangedEventForRemoveRange()
{
// Arrange
List <TestObservableObject> objectsToRemove = TestObservableObjectFaker.Create().Generate(10);
var collection = new ObservableItemCollection <TestObservableObject>();
var tcs = new TaskCompletionSource <NotifyCollectionChangedEventArgs>();
collection.CollectionChanged += (sender, args) =>
{
tcs.SetResult(args);
};
// Act
collection.RemoveRange(objectsToRemove);
// Assert
NotifyCollectionChangedEventArgs collectionChanged = await tcs.Task;
collectionChanged.ShouldNotBeNull();
collectionChanged.OldItems.Count.ShouldBe(objectsToRemove.Count);
foreach (object item in collectionChanged.OldItems)
{
objectsToRemove.ShouldContain(item);
}
}
public async Task ShouldRaiseCollectionChangedEventForAdd()
{
// Arrange
TestObservableObject objectToAdd = TestObservableObjectFaker.Create().Generate();
var collection = new ObservableItemCollection <TestObservableObject>();
var tcs = new TaskCompletionSource <NotifyCollectionChangedEventArgs>();
collection.CollectionChanged += (sender, args) =>
{
tcs.SetResult(args);
};
// Act
collection.Add(objectToAdd);
// Assert
NotifyCollectionChangedEventArgs collectionChanged = await tcs.Task;
collectionChanged.ShouldNotBeNull();
collectionChanged.NewItems.Contains(objectToAdd).ShouldBeTrue();
}