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：
