public static void AddFirst_LinkedListNode()
        {
            LinkedList_T_Tests <string> helper = new LinkedList_T_Tests <string>();

            helper.AddFirst_LinkedListNode(s_generateString);

            LinkedList_T_Tests <int> helper2 = new LinkedList_T_Tests <int>();

            helper2.AddFirst_LinkedListNode(s_generateInt);
        }
        public static void AddFirst_LinkedListNode_Negative()
        {
            LinkedList_T_Tests <string> helper = new LinkedList_T_Tests <string>();

            helper.AddFirst_LinkedListNode_Negative(s_generateString);
        }