Mockito ArgumentCaptor正在返回Null

Question

我正在尝试使用Mockito ArgumentCaptor在我的方法中获取mime消息。当我取回捕获对象时，它的值为null。我试着调试它，但Mockito用增强程序包装了它，所以我看不到内容。这适用于我的方法中的对象。有人有主意吗？

这是我的测试样本。msg不为null，但在此之后调用的方法返回null。

@Test
public void testSendTemplatedMail() throws MessagingException, IOException {
    Context ctx = new Context();
    ctx.setVariable("name", "John Doe");
    ctx.setVariable("subscriptionDate", new Date());
    ctx.setVariable("hobbies", Arrays.asList("Cinema", "Sports", "Music"));
    String templateName = "testEmailTemplateWithoutImage";
    when(mailSenderMock.createMimeMessage()).thenReturn(mock(MimeMessage.class));
    try {
        mailUtils.sendTemplatedMail("John Doe", "[e-mail]",
                        "[e-mail]", "Hello",
                        templateName, ctx);
    } catch (Exception e) {
        e.printStackTrace();
        throw e;
    }
    ArgumentCaptor<MimeMessage> msg = ArgumentCaptor.forClass(MimeMessage.class);
    verify(mailSenderMock, times(1)).createMimeMessage();
    verify(mailSenderMock, times(1)).send(msg.capture());
    verifyNoMoreInteractions(mailSenderMock);
    System.out.println("Sample msg subject = " + msg);
    System.out.println("Sample msg ctype = " + msg.getValue().getContentType());
    System.out.println("Sample msg to = " + msg.getValue().getAllRecipients());
    System.out.println("Sample msg sender = " + msg.getValue().getSender());
    System.out.println("Sample msg from = " + msg.getValue().getFrom());
    System.out.println("Sample msg content = " + msg.getValue().getContent());


    // assertEquals("accountAlmostDone", mv.getViewName());
    // assertEquals("NA", mv.getModel().get("activationCode"));
}

Answer 1

您已存根化createMimeMessage以返回mock。据推测，这个mock就是传递给send的内容；所以你的论点捕获者只是在捕捉嘲笑。mock上的每个方法（getContentType()和其他方法）都只是返回null，因为您还没有对它们进行存根处理。