使用JUnit嘲弄电子邮件服务器时遇到麻烦

Question

我试图模拟发送电子邮件（出于JUnit，V4.8.1，测试的目的），并决定使用Dumbster，我通过SO找到了它。我用的是1.6版。我在JUnit测试中有这个…

    SimpleSmtpServer server = SimpleSmtpServer.start();
    boolean ret = m_emailSvc.sendEmail("[e-mail]", 
                                       "[e-mail]", 
                                       "localhost", 
                                       "Test", 
                                       "Test Body");
    Assert.assertTrue(ret);
    server.stop();

我用这种方式发邮件…

public boolean sendEmail(final String toEmail,
                      final String fromEmail,
                      final String smtpHost,
                      final String subject,
                      final String body)
{

    boolean ret = true;
    // Get system properties
    Properties properties = System.getProperties();

    // Setup mail server
    properties.setProperty("mail.smtp.host", smtpHost);

    // Get the default Session object.
    Session session = Session.getDefaultInstance(properties);

    try{
       // Create a default MimeMessage object.
       MimeMessage message = new MimeMessage(session);

       // Set From: header field of the header.
       message.setFrom(new InternetAddress(fromEmail));

       // Set To: header field of the header.
       message.addRecipient(Message.RecipientType.TO,
                                new InternetAddress(toEmail));

       // Set Subject: header field
       message.setSubject(subject);

       // Now set the actual message
       message.setText(body);

       // Send message
       Transport.send(message);
    }catch (MessagingException mex) {
       ret = false;
       LOG.error(mex.getMessage(), mex);
    }   // try
    return ret;
}   // sendEmail

此操作失败，但以下情况例外。有没有人知道我做错了什么，或者有没有更简单的方法在JUnit测试中模拟发送电子邮件？

java.net.BindException: Permission denied
    at java.net.PlainSocketImpl.socketBind(Native Method)
    at java.net.PlainSocketImpl.socketBind(PlainSocketImpl.java:521)
    at java.net.PlainSocketImpl.bind(PlainSocketImpl.java:414)
    at java.net.ServerSocket.bind(ServerSocket.java:326)
    at java.net.ServerSocket.<init>(ServerSocket.java:192)
    at java.net.ServerSocket.<init>(ServerSocket.java:104)
    at com.dumbster.smtp.SimpleSmtpServer.run(Unknown Source)
    at java.lang.Thread.run(Thread.java:680)
[ERROR]: org.mainco.subco.email.service.EmailServiceImpl - Could not connect to SMTP host: localhost, port: 25
javax.mail.MessagingException: Could not connect to SMTP host: localhost, port: 25;

Answer 1

我决定使用PowerMock(V.1.5.1)来模拟Transport类的静态调用。

@RunWith(PowerMockRunner.class)
public class EmailServiceTest
{

@Autowired
private EmailService m_emailSvc = new EmailServiceImpl();

@Test
@PrepareForTest( Transport.class )
public final void testSendEmail()
{
    suppress(methodsDeclaredIn(Transport.class));
    boolean ret = m_emailSvc.sendEmail("[e-mail]",
                                       "[e-mail]", 
                                       "localhost",
                                       "Test",
                                       "Test Body");
    Assert.assertTrue(ret);
}   // testSendEmail