public void FindNextBiggerNumber_input3456432_3462345returned()
        {
            int result = Task_2_3.FindNextBiggerNumber(3456432);

            Assert.AreEqual(result, 3462345);
        }
        public void FindNextBiggerNumber_input1234321_1241233returned()
        {
            int result = Task_2_3.FindNextBiggerNumber(1234321);

            Assert.AreEqual(result, 1241233);
        }
        public void FindNextBiggerNumber_input8_negative_1returned()
        {
            int result = Task_2_3.FindNextBiggerNumber(8);

            Assert.AreEqual(result, -1);
        }
        public void FindNextBiggerNumber_input2017_2071returned()
        {
            int result = Task_2_3.FindNextBiggerNumber(2017);

            Assert.AreEqual(result, 2071);
        }
        public void FindNextBiggerNumber_input513_531returned()
        {
            int result = Task_2_3.FindNextBiggerNumber(513);

            Assert.AreEqual(result, 531);
        }
        public void FindNextBiggerNumber_input12_21returned()
        {
            int result = Task_2_3.FindNextBiggerNumber(12);

            Assert.AreEqual(result, 21);
        }