public void ShouldBeAbleToGetTotalAmountDueForClient()
        {
            //Arrange
            var customerDataServiceMock = Mock.Create<ICustomerDataService>();
            var customer = Mock.Create<Customer>();
            var customerId = Guid.NewGuid();

            customer.Arrange(x => x.GetMowingCharge()).Returns(10);
            customer.Arrange(x => x.GetWateringCharge()).Returns(15);
            customer.Arrange(x => x.GetWeedingCharge()).Returns(25);
            var expectedTotal = 50;

            customerDataServiceMock.Arrange(x => x.GetCustomer(customerId)).Returns(customer);

            var customerBillingService = new CustomerBillingService(customerDataServiceMock);

            //Act
            var result = customerBillingService.GetCustomerCurrentAmountDue(customerId);

            //Assert
            Assert.AreEqual(expectedTotal, result);
        }
        public void ShouldBeAbleToGetTotalAmountDueForClient()
        {
            //Arrange
            var customerDataServiceMock = Mock.Create <ICustomerDataService>();
            var customer   = Mock.Create <Customer>();
            var customerId = Guid.NewGuid();

            customer.Arrange(x => x.GetMowingCharge()).Returns(10);
            customer.Arrange(x => x.GetWateringCharge()).Returns(15);
            customer.Arrange(x => x.GetWeedingCharge()).Returns(25);
            var expectedTotal = 50;

            customerDataServiceMock.Arrange(x => x.GetCustomer(customerId)).Returns(customer);

            var customerBillingService = new CustomerBillingService(customerDataServiceMock);

            //Act
            var result = customerBillingService.GetCustomerCurrentAmountDue(customerId);

            //Assert
            Assert.AreEqual(expectedTotal, result);
        }