ASP.NET 系列：单元测试之SmtpClient

使用SmtpClient发送Email时，我们可以创建ISmtpClient接口和SmtpClientWrapper适配类，在单元测试中对ISmtpClient进行Mock或自定义FackeSmtpClient，但nDumbster的Facke SMTP Server给我们提供了更直观更简单的方式进行单元测试。可以通过Nuget搜索nDumbster，这里使用的是netDumbster。

1.IEmailSender接口

public interface IEmailSender
{
void SendMail(string from, string to, string subject, string body);
}

2.SMTPAdapter实现类

public interfacepublic class SMTPAdapter : IEmailSender
{
public void SendMail(string from, string to, string subject, string body)
{
var message = new MailMessage();
message.IsBodyHtml = true;
message.From = new MailAddress(from);
message.To.Add(new MailAddress(to));
message.Subject = subject;
message.Body = body;
using (var smtpClient = new SmtpClient())
{
if (smtpClient.Host == null)
{
smtpClient.Host = "localhost";
}
smtpClient.Send(message);
}
}
}

3.使用nDumbster单元测试

public class SMTPAdapterTest
{
[Fact]
public void SendMailTest()
{
SimpleSmtpServer server = SimpleSmtpServer.Start(25);
IEmailSender sender = new SMTPAdapter();
sender.SendMail("sender@here.com", "receiver@there.com", "subject", "body");
Assert.Equal(1, server.ReceivedEmailCount);
SmtpMessage mail = (SmtpMessage)server.ReceivedEmail[0];
Assert.Equal("sender@here.com", mail.Headers["From"]);
Assert.Equal("receiver@there.com", mail.Headers["To"]);
Assert.Equal("subject", mail.Headers["Subject"]);
Assert.Equal("body", mail.MessageParts[0].BodyData);
server.Stop();
}
}

运行结果：