public void Registering_a_valid_new_customer_sends_a_confirmation_mail()
{
// Arrange
var mailer = Substitute.For <IMailer>();
var validCustomer = new ValidCustomer();
var sut = new RegistrationService(mailer);
// Act
sut.Register(validCustomer);
// Assert
mailer.Received().Send();
}
public void Register(ValidCustomer validCustomer)
{
_mailer.Send();
}
