public void CountToNumber_MultiplesOfFivePong_True() { List <string> expectedList = new List <string> { }; expectedList.Add("1"); expectedList.Add("2"); expectedList.Add("ping"); expectedList.Add("4"); expectedList.Add("pong"); List <string> actualList = PingPong.CountToNumber(5); CollectionAssert.AreEqual(expectedList, actualList); }