public void input_is_576_should_return_657()
        {
            var input    = 576;
            var expected = 657;
            var actual   = NextLargerNumber.Next(input);

            Assert.AreEqual(expected, actual);
        }
        public void Test_11200_should_return_12001()
        {
            var input    = 11200;
            var expected = 12001;
            var actual   = NextLargerNumber.Next(input);

            Assert.AreEqual(expected, actual);
        }
        public void Test_input_is_345_should_return_354()
        {
            var input    = 345;
            var expected = 354;
            var actual   = NextLargerNumber.Next(input);

            Assert.AreEqual(expected, actual);
        }
        public void Test_input_is_531_should_be_largetNumber()
        {
            var input    = 531;
            var expected = NoLargerNumber;
            var actual   = NextLargerNumber.Next(input);

            Assert.AreEqual(expected, actual);
        }
        public void Test_input_is_12_should_return_21()
        {
            var input    = 12;
            var expected = 21;
            var actual   = NextLargerNumber.Next(input);

            Assert.AreEqual(expected, actual);
        }
        public void Test_9_should_be_largestNumber()
        {
            var input    = 9;
            var expected = NoLargerNumber;
            int actual   = NextLargerNumber.Next(input);

            Assert.AreEqual(expected, actual);
        }
        public void Test_15963_should_return_16359()
        {
            var input    = 15963;
            var expected = 16359;
            var actual   = NextLargerNumber.Next(input);

            Assert.AreEqual(expected, actual);
        }