public void GetEnumeratorWorksWithItemsSource()
{
var collection = new ItemsSourceCollection();
var itemsSource = CreateIntItemsSource(5);
IEnumerator collectionEnumerator;
IEnumerator itemsEnumerator;
collection.ItemsSource = itemsSource;
collectionEnumerator = collection.GetEnumerator();
itemsEnumerator = itemsSource.GetEnumerator();
TestEnumeratorEquality(collectionEnumerator, itemsEnumerator);
}
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 GetEnumeratorWorksWithNonEnumerableItemsSource()
{
var collection = new ItemsSourceCollection();
var itemsSource = CreateNonEnumerableItemsSource();
IEnumerator enumerator;
collection.ItemsSource = itemsSource;
enumerator = collection.GetEnumerator();
var enumerationNotStartedEx = Record.Exception(() => enumerator.Current);
Assert.IsType <InvalidOperationException>(enumerationNotStartedEx);
Assert.True(enumerator.MoveNext());
Assert.Same(itemsSource, enumerator.Current);
Assert.False(enumerator.MoveNext());
var enumerationStoppedEx = Record.Exception(() => enumerator.Current);
Assert.IsType <InvalidOperationException>(enumerationStoppedEx);
}