EmailSender Component

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The EmailSender component is used to abstract email sending approaches.

Simple example on how to use the EmailSender Component

In this example the RegisterCustomerService class is used to register new customers on a fictitious shop (MyShop). As part of the registration the new customer gets emailed a "Welcome Email" when they first register.


public class RegisterCustomerService
{
    public IEmailSender EmailSender { get; set; }

    public void Register(Customer customer)
    {
        //Save customer details in database
        //customer.Save();

        //Send email to customer, welcoming them to our store
        EmailSender.Send("MyShop@somewhere.com", customer.Email, "Welcome to MyShop", 
            String.Format("Hi {0},\nWelcome to our shop!", customer.Firstname));
    }
}

public class Customer
{
    public string Email { get; set; }
    public string Firstname { get; set; }
}

Here is a simple way of testing the RegisterCustomerService class above to ensure that the email is being sent to the right customer. This test uses Rhino Mocks.


[TestFixture]
public class RegisterCustomerServiceTest
{
    [Test]
    public void Customer_Registration_Sends_Email_To_Correct_Customer()
    {
        MockRepository mockery = new MockRepository();
        IEmailSender mockEmailSender = mockery.StrictMock<IEmailSender>();

        RegisterCustomerService registerCustomerService = new RegisterCustomerService
                                                            {
                                                                EmailSender = mockEmailSender
                                                            };

        using (mockery.Record())
        {
            mockEmailSender.Send(null, null, null, null);
            LastCall.On(mockEmailSender).Constraints(Rhino.Mocks.Constraints.Is.Anything(),
                                                     Rhino.Mocks.Constraints.Is.Equal("blah@somewhere.com"),
                                                     Rhino.Mocks.Constraints.Is.Anything(),
                                                     Rhino.Mocks.Constraints.Text.StartsWith("Hi Tim"));
        }

        using (mockery.Playback())
        {
            Customer customer = new Customer();
            customer.Email = "blah@somewhere.com";
            customer.Firstname = "Tim";

            registerCustomerService.Register(customer);
        }
    }
}

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EmailSender Component

Simple example on how to use the EmailSender Component