public void PinLengthTest()
        {
            PinGeneratorService testExample = new PinGeneratorService();
            string result = testExample.Generate();

            Assert.IsTrue(result.Length == 4);
        }
        public void PinIntTest()
        {
            PinGeneratorService testExample = new PinGeneratorService();
            string result = testExample.Generate();
            int    num;

            Assert.IsTrue(int.TryParse(result, out num));
        }