public void ObservableSelect_ChangeItemsTest()
{
var collection = new ObservableCollection<TestObject>();
var values = collection.ObservableSelect(item => item.Value);
var receivedEvents = new ObservableIndexer<NotifyCollectionChangedAction, int>(_ => 0);
var expectedValues = new[] { 2, 3, 4 };
var expectedEvents = new[] { KeyValuePair(NotifyCollectionChangedAction.Replace, 3) };
var testObject1 = new TestObject { Value = 1 };
var testObject2 = new TestObject { Value = 2 };
var testObject3 = new TestObject { Value = 3 };
NotifyCollectionChangedEventHandler collectionChangedEventHandler = (sender, e) =>
{
receivedEvents[e.Action] += 1;
};
collection.AddRange(testObject1, testObject2, testObject3);
values.CollectionChanged += collectionChangedEventHandler;
foreach (var item in collection)
{
item.Value += 1;
}
Assert.IsTrue(receivedEvents.SequenceEqual(expectedEvents));
Assert.IsTrue(values.SequenceEqual(expectedValues));
}
