public void CheckPing_NumberDivisibleByThree_False()
 {
     Assert.AreEqual(false, PingPongs.CheckPing(8));
     Assert.AreEqual(false, PingPongs.CheckPing(17));
 }
 public void CheckPing_NumberDivisibleByThree_True()
 {
     Assert.AreEqual(true, PingPongs.CheckPing(9));
     Assert.AreEqual(true, PingPongs.CheckPing(12));
 }