public void FindNextBiggerNumber_Test_WrongValues_ReturnsException(int number)
 {
     Assert.Throws <ArgumentException>(
         () => FindNextBiggerNumber.FindingNextBiggerNumber(number));
 }
        public void FindNextBiggerNumber_Test_CorrectValues_Success(int number, int expected)
        {
            int result = FindNextBiggerNumber.FindingNextBiggerNumber(number);

            Assert.AreEqual(result, expected);
        }