public void DefaultCollectionModificationRaisesChangeEvents()
{
var collection = new ItemsSourceCollection();
// We want to test that the following methods raise the
// PropertyChanged/CollectionChanged events.
TestChangeEventsForAction(() => collection.Add(1));
TestChangeEventsForAction(() =>
{
collection.Add(0);
collection.Remove(0);
});
TestChangeEventsForAction(() =>
{
collection.Add(0);
collection.RemoveAt(0);
});
TestChangeEventsForAction(() => collection.Clear());
// Checks if the *Changed events are raised when executing changeAction().
void TestChangeEventsForAction(Action changeAction)
{
Assert.PropertyChanged(
collection,
nameof(ItemsSourceCollection.Count),
changeAction);
Assert.PropertyChanged(
collection,
"Items[]",
changeAction);
AssertCollectionChanged(
collection,
changeAction);
}
}
public void ThrowsWhenModifyingCollectionWithItemsSource()
{
var itemsSource = CreateIntItemsSource(5);
var collection = new ItemsSourceCollection();
collection.ItemsSource = itemsSource;
TestForMethod(() => collection.Add(0));
TestForMethod(() => collection.Remove(0));
TestForMethod(() => collection.RemoveAt(0));
TestForMethod(() => collection.Clear());
Assert.True(collection.Cast <int>().SequenceEqual(itemsSource));
void TestForMethod(Action method)
{
var ex = Record.Exception(method);
Assert.NotNull(ex);
Assert.IsType <InvalidOperationException>(ex);
}
}