如何使用起订量

Question

嘲笑新实例，我想嘲笑都MailMessage和SmptpClient

public void SendEmail(string emailAddress, string subject, string body) 
{ 
    using (var mail = new MailMessage(NoReplyEmailAddress, emailAddress)) 
    { 
     mail.Subject = subject; 
     mail.Body = body; 
     mail.IsBodyHtml = true; 

     using (var client = new SmtpClient()) 
     { 
      client.Host = SmtpHost; 
      client.Port = SmtpPort; 
      client.DeliveryMethod = SmtpDeliveryMethod.Network; 
      client.Send(mail); 
     } 
    } 
} 

和我的测试方法测试使用MOQ下面的方法是：

public void TestSendEmail() 
{ 
    Mock<MailMessage> mailMessageMock = new Mock<MailMessage>(); 
    MailMessage message = (MailMessage)mailMessageMock.Setup(m => new MailMessage()).Returns(mailMessageMock.Object); 
    Mock<SmtpClient> smtpClientMock = new Mock<SmtpClient>(); 
    smtpClientMock.Setup(s => new SmtpClient()).Returns(smtpClientMock.Object); 

    EmailService emailService = new EmailService(); 
    emailService.SendEmail("tester@gmail.com","Test Mail", "Content"); 

    mailMessageMock.Verify(m => m.Subject); 
    mailMessageMock.Verify(m => m.Body); 
    mailMessageMock.Verify(m => m.IsBodyHtml); 

    smtpClientMock.Verify(s=>s.Host); 
    smtpClientMock.Verify(s=>s.Port); 
    smtpClientMock.Verify(s=>s.DeliveryMethod); 
    smtpClientMock.Verify(s=>s.Send(message)); 
} 

但它不工作是无论如何要做到这一点？

Answer 1

你的代码无法测试，您可以通过多种方式修复它，例如：

通过SmtpClient创建抽象第二MailMessage类型：

public interface ISmtpClient 
{ 
    void Send(MailMessage msg, string host, int port, SmtpDeliveryMethod deliveryMethod); 
} 

public interface IMailMessageComposer 
{ 
    MailMessage Create(string noReplyEmailAddress, string emailAddress, string subject, string body, bool isHtml); 
} 

用你的逻辑创建非常简单的实现：

public class MySmtpClient : ISmtpClient 
{ 
    public void Send(MailMessage msg, string host, int port, SmtpDeliveryMethod deliveryMethod) 
    { 
     using (var client = new SmtpClient()) 
     { 
      client.Host = host; 
      client.Port = port; 
      client.DeliveryMethod = deliveryMethod; 
      client.Send(msg); 
     } 
    } 
} 

public class MailMessageComposer : IMailMessageComposer 
{ 
    public MailMessage Create(string noReplyEmailAddress, string emailAddress, string subject, string body, bool isHtml) 
    { 
     return new MailMessage(noReplyEmailAddress, emailAddress) 
     { 
      Subject = subject, 
      Body = body, 
      IsBodyHtml = isHtml 
     }; 
    } 
} 

然后注入这些依赖于你的类，这是负责发送电子邮件：

public class EmailService 
{ 
    private readonly ISmtpClient _smtpClient; 
    private readonly IMailMessageComposer _mailMessageComposer; 

    public EmailService(ISmtpClient smtpClient, IMailMessageComposer mailMessageComposer) 
    { 
     _smtpClient = smtpClient; 
     _mailMessageComposer = mailMessageComposer; 
    } 

    public void SendEmail(string emailAddress, string subject, string body) 
    { 
     var message = _mailMessageComposer.Create(NoReplyEmailAddress, emailAddress, subject, body, true); 
     _smtpClient.Send(message, SmtpHost, SmtpPort, SmtpDeliveryMethod.Network); 
    } 
} 

现在您可以测试SmtpClient和MailMessage sepa得非常好。

测试：

public void Create_MailMessage() 
{ 
    var mailComposer = new MailMessageComposer(); 

    var mailMessage = mailComposer.Create("noReply@example.com", "email@example.com", "subject", "body", true); 

    Assert.Equal("noReply@example.com", mailMessage.Subject); 
    Assert.Equal("body", mailMessage.Body); 
    //etc. 
} 

Answer 2

对于嘲讽MAILMESSAGE和SMTPClient班，他们应该在EmailServiceConstructor注射

public class EmailService { 
    //Constructor 
    public EmailService(MailMessage mailmsgObj, SmtpClient smtpClient) 
    { 

    } 

} 

然后，你可以注入嘲笑类MAILMESSAGE和smtpclient，而在你的测试用例创建EmailServiceObject

Mock<MailMessage> mailMessageMock = new Mock<MailMessage>(); 
    MailMessage message = (MailMessage)mailMessageMock.Setup(m => new  MailMessage()).Returns(mailMessageMock.Object); 
    Mock<SmtpClient> smtpClientMock = new Mock<SmtpClient>(); 
    smtpClientMock.Setup(s => new SmtpClient()).Returns(smtpClientMock.Object); 

    EmailService emailService = new EmailService(mailMessageMock.object,smtpClientMock.object);