我如何测试Spring的JavaMailSender

Question

我有一个注入了JavaMailSender的服务。我的服务配置它并发送邮件。我想拦截原始邮件以确保信息是正确的。我想在JUnit中做到这一点。

你们会怎么做？

@Service
public class MyServiceImpl {

    @Autowired
    private JavaMailSender _mailSender;

    public void sendMail(String to, String body, String subject){
        ...
        _mailSender.something
        ...
    }
}

Answer 1

我用GreenMail完成了它。看看my blog post about it，你也会找到一个有效的例子。

Answer 2

您可以使用测试SMTP服务器，如Dumbster。请参阅以下示例：

@Test
    public void sendSimpleEmailWithCC() {
        // Runs a Dumbster simple SMTP server - default config
        SimpleSmtpServer server = SimpleSmtpServer.start();
        String from = "[email protected]";
        String to = "[email protected]";
        String messageText = "Good message";
        String title = "Test message";
        String cc = "[email protected]";
        Assert.assertTrue(mailSender
                .sendEmail(from, to, cc, title, messageText));
        server.stop();
        Assert.assertTrue(server.getReceivedEmailSize() == 1);
        Iterator emailIter = server.getReceivedEmail();
        SmtpMessage email = (SmtpMessage) emailIter.next();
        Assert.assertTrue(email.getHeaderValue("From").equals(from));
        Assert.assertTrue(email.getHeaderValue("To").equals(to));
        Assert.assertTrue(email.getHeaderValue("Cc").equals(cc));
        Assert.assertTrue(email.getHeaderValue("Subject")
                .equals("Test message"));
        Assert.assertTrue(email.getBody().equals(messageText));
    }

Answer 3

如果您的目标是仅使用Junit / Mockito并在发送之前测试MimeMessage的形成方式，那么下面的配置就足够了：

public class EmailServiceTest {

    private EmailServiceImpl emailServiceImpl;

    private JavaMailSender javaMailSender;

    private MimeMessage mimeMessage;

    @Before
    public void before() {
        mimeMessage = new MimeMessage((Session)null);
        javaMailSender = mock(JavaMailSender.class);
        when(javaMailSender.createMimeMessage()).thenReturn(mimeMessage);
        emailServiceImpl = new EmailService(javaMailSender);
    }

    @Test
    public void emailTest() {
        String recipient = "[email protected]"
        EmailRequest request = new EmailRequest();
        request.setRecipient(recipient);
        emailServiceImpl.send(request);
        assertEquals(recipient, mimeMessage.getRecipients(RecipientType.TO)[0].toString());
    }
}