public void Numbers_PingPongNumberLineGenerates_True() { PingPong testPingPong = new PingPong(); List <string> expectedResultList = new List <string> { "1", "2", "ping", "4", "pong", "ping", "7", "8", "ping", "pong", "11", "ping", "13", "14", "PiNg-PoNg", "16", "17", "ping", "19", "pong" }; var actualResult = testPingPong.NumberRange(20); CollectionAssert.AreEqual(expectedResultList, actualResult); }