public void Test_ConcurrentObservableCollection_InsertRange()
{
var initial = Enumerable.Range(0, 100).ToList();
var toAdd = Enumerable.Range(100, 100).ToList();
var startIndex = 50;
var collection = new ConcurrentObservableCollection <int>();
collection.AddRange(initial);
Assert.AreEqual(100, collection.Count);
// Record all the collection changed events
List <(object, NotifyCollectionChangedEventArgs)> returnedList = new List <(object, NotifyCollectionChangedEventArgs)>();
collection.CollectionChanged += (s, e) => returnedList.Add((s, e));
collection.InsertRange(startIndex, toAdd);
// Check just one collection changed event was fired
Assert.AreEqual(1, returnedList.Count);
(var returnedObject, var returnedArgs) = returnedList[0];
Assert.AreEqual(returnedObject, collection);
Assert.AreEqual(NotifyCollectionChangedAction.Add, returnedArgs.Action);
Assert.AreEqual(startIndex, returnedArgs.NewStartingIndex);
Assert.IsNotNull(returnedArgs.NewItems);
Assert.IsNull(returnedArgs.OldItems);
Assert.AreEqual(toAdd.Count(), returnedArgs.NewItems.Count);
Assert.IsTrue(CollectionsAreEqual(toAdd, returnedArgs.NewItems));
}
