public void EnumeratorDoesNotIncludeConcurrentModifications()
{
//Arrange
var arr = new[] { 1, 2, 3 };
var deque = new ConcurrentDeque <Int32>(arr);
Int32 item;
//Act
var iterator = deque.GetEnumerator();
iterator.MoveNext();
deque.TryPopLeft(out item);
deque.TryPopLeft(out item);
deque.PushLeft(6);
deque.TryPopRight(out item);
deque.PushRight(6);
//Assert
Assert.AreEqual(1, iterator.Current);
Assert.True(iterator.MoveNext());
Assert.AreEqual(2, iterator.Current);
Assert.True(iterator.MoveNext());
Assert.AreEqual(3, iterator.Current);
Assert.False(iterator.MoveNext());
}