public void NextCodeTestA19999()
        {
            string oldCode = "A19999";
            SequenceGenerator generator = new SequenceGenerator();

            string newCode = generator.NextCode(oldCode);

            Assert.AreEqual(newCode, "A20000");
        }
        public void NextCodeTestZBR934()
        {
            string oldCode = "ZBR934";
            SequenceGenerator generator = new SequenceGenerator();

            string newCode = generator.NextCode(oldCode);

            Assert.AreEqual(newCode, "ZBR935");
        }
        public void NextCodeTestZZZZZZ()
        {
            string oldCode = "ZZZZZZ";
            SequenceGenerator generator = new SequenceGenerator();

            string newCode = generator.NextCode(oldCode);
           
        }