public void Have_Ability_To_Add_To_Head_Or_Tail_Node()
{
LinkedList<int> list = new LinkedList<int>();
Node<int> headNode = new Node<int>(100);
Node<int> tailNode = new Node<int>(200);
list.AddToHead(headNode);
list.AddToTail(tailNode);
Assert.AreSame(headNode, list.Head);
Assert.AreSame(tailNode, list.Tail);
}