public void AddFiveItemsCopyToArray()
        {
            var linkedListStackArray = new int[5];
            var arrayStackArray      = new int[5];
            int linkedListStackLast  = 0;
            int arrayStackLast       = 0;

            for (int i = 1; i <= 5; i++)
            {
                linkedListStack.Push(i);
                arrayStack.Push(i);
            }
            foreach (var item in linkedListStack.Get())
            {
                linkedListStackLast = item;
            }

            foreach (var item in arrayStack.Get())
            {
                arrayStackLast = item;
            }

            linkedListStack.CopyTo(linkedListStackArray, 0);
            arrayStack.CopyTo(arrayStackArray, 0);

            Assert.AreEqual(linkedListStackLast, 1, "invalid last element");
            Assert.AreEqual(arrayStackLast, 1, "invalid last element");

            Assert.AreEqual(linkedListStackArray[0], 5, "invalid element");
            Assert.AreEqual(arrayStackArray[0], 5, "invalid element");

            Assert.AreEqual(linkedListStackArray[4], 1, "invalid element");
            Assert.AreEqual(arrayStackArray[4], 1, "invalid element");
        }