public override void Enqueue(T item)
{
if (!IsValidObject(item))
{
throw new ArgumentException(nameof(item));
}
items.AddLast(item);
}
public void AddNullItem()
{
var list = new CircularDoublyLinkedList <string>();
list.AddFirst(null);
list.AddLast(null);
list.AddAfter(null, null);
list.AddBefore(null, null);
Assert.AreEqual(list.Count(), 4, "invalid count");
list.Remove(null);
list.RemoveFirst();
list.RemoveLast();
Assert.AreEqual(list.Count(), 1, "invalid count");
}
public void AddTwoNodesToTail()
{
circularDoublyLinkedList.AddLast(1);
circularDoublyLinkedList.AddLast(2);
Assert.AreEqual(circularDoublyLinkedList.GetFirst(), 1, "invalid head element");
Assert.AreEqual(circularDoublyLinkedList.GetLast(), 2, "invalid tail element");
}
