static void Main(string[] args)
        {
            Console.WriteLine("Please, input the annual electric consumption.");
            string strConsumptionPerYear = Console.ReadLine();

            int.TryParse(strConsumptionPerYear, out var consuptionPerYear);

            ITariffCalculator productA = new ProductA();
            ITariffCalculator productB = new ProductB();

            TariffCalculateService service = new TariffCalculateService(productA, productB);
            var list = service.GetList(consuptionPerYear);

            Console.WriteLine("------------------------------------------------------------");
            Console.WriteLine("See the two products sorted by annual tariff.");
            int count = 0;

            list.ForEach(x =>
            {
                count += 1;
                Console.WriteLine($"{count} - {x.Title}: {x.AnnualTariff} euros");
            });

            Console.ReadKey();
        }
        public void ShouldCreateAnInstanceOfTariffCalculateService()
        {
            var service = new TariffCalculateService(new ProductA(), new ProductB());

            service.Should().NotBeNull();
        }