public void Test_ConcurrentObservableCollection_Reset()
{
var initial = Enumerable.Range(0, 100).ToList();
var toAdd = Enumerable.Range(100, 100).ToList();
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.Reset(toAdd);
// Check two collection changed events were fired
Assert.AreEqual(2, returnedList.Count);
(var returnedObject0, var returnedArgs0) = returnedList[0];
(var returnedObject1, var returnedArgs1) = returnedList[1];
Assert.IsNotNull(returnedObject0);
Assert.IsNotNull(returnedArgs0);
Assert.IsNotNull(returnedObject1);
Assert.IsNotNull(returnedArgs1);
Assert.AreEqual(returnedObject0, collection);
Assert.AreEqual(returnedObject1, collection);
Assert.AreEqual(NotifyCollectionChangedAction.Remove, returnedArgs0.Action);
Assert.AreEqual(NotifyCollectionChangedAction.Add, returnedArgs1.Action);
Assert.IsNull(returnedArgs0.NewItems);
Assert.IsNotNull(returnedArgs0.OldItems);
Assert.AreEqual(initial.Count(), returnedArgs0.OldItems.Count);
Assert.IsTrue(CollectionsAreEqual(initial, returnedArgs0.OldItems));
Assert.IsNull(returnedArgs1.OldItems);
Assert.IsNotNull(returnedArgs1.NewItems);
Assert.AreEqual(toAdd.Count(), returnedArgs1.NewItems.Count);
Assert.IsTrue(CollectionsAreEqual(toAdd, returnedArgs1.NewItems));
}
