public void AddCustomerService_Test()
        {
            Customer customer = new Customer()
            {
                LastName      = "POsosx",
                PaymentMethod = new PaymentMethod()
                {
                    PaymentName = "Ща", DecriptionPayment = "osa"
                },
                Name = "Dasa"
            };
            bool item = service.AddItemAsync(customer).GetAwaiter().GetResult();

            Assert.IsTrue(item);
            var count = service.GetItemsAsync().GetAwaiter().GetResult().Count();

            Assert.AreEqual(2, count);
        }