ASP.NET系列：单元测试之SmtpClient

2019-11-14 14:14:59

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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();    }}