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 AddFirstNode()
{
circularDoublyLinkedList.AddFirst(1);
Assert.IsNotNull(circularDoublyLinkedList.GetFirst(), "Linked List is empty");
}
