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 CanAddItemsNormally()
{
var collection = new ItemsSourceCollection();
int itemToAdd = 1;
collection.Add(itemToAdd);
Assert.Contains(itemToAdd, collection);
}
public void IndexAccessorWorksWithDefaultCollection()
{
var collection = new ItemsSourceCollection();
int itemToAdd = 1;
collection.Add(0); // Placeholder, so that the index exists.
collection[0] = itemToAdd;
Assert.Equal(itemToAdd, collection[0]);
}
public void GetEnumeratorWorksWithDefaultCollection()
{
var collection = new ItemsSourceCollection();
var items = new int[] { 1, 2, 3, 4, 5 };
IEnumerator collectionEnumerator;
IEnumerator itemsEnumerator;
foreach (var item in items)
{
collection.Add(item);
}
collectionEnumerator = collection.GetEnumerator();
itemsEnumerator = items.GetEnumerator();
TestEnumeratorEquality(collectionEnumerator, itemsEnumerator);
}
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);
}
}