public static RaiseCollectionEventExpectation WithNew(this NotifyCollectionChangedAction action, params object[] items)
 {
     return action.AsEvent().WithNew(items);
 }
 public static RaiseCollectionEventExpectation WithNewCount(this NotifyCollectionChangedAction action, int count)
 {
     return action.AsEvent().WithNewCount(count);
 }
 public static RaiseCollectionEventExpectation AtOld(this NotifyCollectionChangedAction action, int index)
 {
     return action.AsEvent().AtOld(index);
 }