public void FindNextBiggerNumber_negativenumber_exceptionreturned()
        {
            // Arrange.
            int number = -1;

            // Act.
            MathAlgorithm.FindNextBiggerNumber(number);
        }
        public void FindNextBiggerNumber_12_21returned()
        {
            // Arrange.
            int number   = 12;
            int expected = 21;

            // Act.
            int actual = MathAlgorithm.FindNextBiggerNumber(number);

            // Assert.
            Assert.AreEqual(expected, actual);
        }
 public int FindNextBiggerNumberTest(int number)
 {
     return(MathAlgorithm.FindNextBiggerNumber(number));
 }