public void ModifyOnlySubset()
{
// Arrange
ObservableCollection <int> set = new ObservableCollection <int>(new[] { 2, 3, 5, 6, 7 });
IObservableCollectionSubset <int> subSet = set.Where(i => i % 2 == 0);
CollectionListener collectionListener = new CollectionListener();
subSet.AddListener(collectionListener);
int[] array1 = subSet.ToArray();
// Act
subSet.Remove(6, false);
int[] array2 = subSet.ToArray();
// Assert
CollectionAssert.AreEqual(new[] { 2, 6 }, array1);
CollectionAssert.AreEqual(new[] { 2 }, array2);
CollectionAssert.AreEqual(new[] { 2, 3, 5, 6, 7 }, set); // Origin set mustn't be modified
Assert.AreEqual(1, collectionListener.Removed);
}
public void WhereIteration()
{
// Arrange
ObservableCollection <int> set = new ObservableCollection <int>(new[] { 1, 2, 3, 4, 5, 6, 7, 8, 9 });
IObservableEnumerable <int> subset = set.Where(i => i % 2 == 0);
CollectionListener collectionListener = new CollectionListener();
subset.AddListener(collectionListener);
int[] array1 = subset.ToArray();
// Act
set.Add(12);
set.Add(13);
set.Add(14);
int[] array2 = subset.ToArray();
// Assert
CollectionAssert.AreEqual(new[] { 2, 4, 6, 8 }, array1);
CollectionAssert.AreEqual(new[] { 2, 4, 6, 8, 12, 14 }, array2);
CollectionAssert.AreEqual(new[] { 1, 2, 3, 4, 5, 6, 7, 8, 9, 12, 13, 14 }, set); // Origin set must(!) be modified
Assert.AreEqual(2, collectionListener.Added);
}