You may refactor your code a little bit. In the "Working with Legacy Code" book by Martin Fowler, he describes a technique of separating the external API (think Java Mail API) from your own application code. The technique is called "Wrap and Skin" and is pretty simple.

你应该做的是:

1. Create an interface MySession (which is your own stuff) by extracting methods from the javax.mail.Session class.
2. Implement that interface by creating a concrete class (looking a bit like the original javax.mail.Session)
3. In each method DELEGATE the call to equivalent javax.mail.Session method
4. Create your mock class which implements MySession :-)
5. Update your production code to use MySession instead of javax.mail.Session

幸福检测!

EDIT: Also take a look at this blog post: http://www.mhaller.de/archives/18-How-to-mock-a-thirdparty-final-class.html

http://code.google.com/p/powermock/wiki/MockitoUsage13”

@RunWith(PowerMockRunner.class)
// We prepare PartialMockClass for test because it s final or we need to mock private or static methods
@PrepareForTest(javax.mail.Session.class)
public class YourTestCase {

  @Test
  public void test() throws Exception {

    PowerMockito.doReturn(value).when(classUnderTest, "methodToMock", "parameter1");
  }
}

您可使用Mock Javamail项目。 我先从。 Alan Franzoni还拥有一个primer for it。

当你把这一杰尔档案放在你的班子里时,它就把任何邮件寄给记忆箱,可以立即检查。 它很容易使用。

Adding this to your classpath is admittedly a pretty heavy handed way to mock something, but you rarely want to send real emails in your automated tests anyway.

如果你想要模拟最后班级,你可以使用JDaveunfinalizer,可在以下网址查阅:。

该图书馆随后可与JMock2()一起进行测试,因为我知道Mockito与JDave不相容。

public class SendEmailGood {
    private final Supplier<Message> messageSupplier;
    private final Consumer<Message> messageSender;

    public SendEmailGood(Supplier<Message> messageSupplier,
                         Consumer<Message> messageSender) {
        this.messageSupplier = messageSupplier;
        this.messageSender = messageSender;
    }

    public void send(String[] addresses, String from, 
                     String subject, String body) 
                     throws MessagingException {
        Message message = messageSupplier.get();
        for (String address : addresses) {
           message.addRecipient
             (Message.RecipientType.TO, new InternetAddress(address));
        }
        message.addFrom(new InternetAddress[]{new InternetAddress(from)});
        message.setSubject(subject);
        message.setText(body);
        messageSender.accept(message);
    } 
}

@Test
public void sendBasicEmail() throws MessagingException {
    final boolean[] messageCalled = {false};

    Consumer<Message> consumer = message -> {
            messageCalled[0] = true;
    };

    Message message = mock(Message.class);
    Supplier<Message> supplier = () -> message;

    SendEmailGood sendEmailGood = new SendEmailGood(supplier, consumer);
    String[] addresses = new String[2];

    addresses[0] = "[email protected]";
    addresses[1] = "[email protected]";
    String from = "[email protected]";
    String subject = "Test Email";
    String body = "This is a sample email from us!";

    sendEmailGood.send(addresses, from, subject, body);
    verify(message).addRecipient(Message.RecipientType.TO, new InternetAddress("[email protected]"));
    verify(message).addRecipient(Message.RecipientType.TO, new InternetAddress("[email protected]"));
    verify(message).addFrom(new InternetAddress[]{new InternetAddress("[email protected]")});
    verify(message).setSubject(subject);
    verify(message).setText(body);

    assertThat(messageCalled[0]).isTrue();
}

创建一体化测试,展示真正的会议和运输。

Consumer<Message> consumer = message -> {
    try {
        Transport.send(message);
    } catch (MessagingException e) {
        e.printStackTrace();
    }
};

Supplier<Message> supplier = () -> {
    Properties properties = new Properties();
    return new MimeMessage(Session.getDefaultInstance(properties));
};

See the PowerMock docs for running under Japannit 3 ,因为它没有操作器,也没有使用密码操纵工具。

这是一个很老的问题,但你可以总是使用

I use the mock-javamail library. It just replace the origin javamail implementation in the classpath. You can send mails normally, it just sends to in-memory MailBox, not a real mailbox.

Finally, you can use the MailBox object to assert anything you want to check.