public void AddTwoNumbersTest() { LinkedList <int> num1 = new LinkedList <int>(); num1.AddLast(2); num1.AddLast(4); num1.AddLast(3); num1.AddLast(2); LinkedList <int> num2 = new LinkedList <int>(); num2.AddLast(5); num2.AddLast(6); num2.AddLast(4); LinkedList <int> sum = Algorithm.AddTwoNumbers(num1, num2); string stringSum = ""; foreach (int i in sum) { stringSum = i.ToString() + stringSum; } string stringSolution = "2807"; Assert.Equal(stringSum, stringSolution); }