如何向注入的类成员提供模拟实例

Question

我正在使用JUnit 4和mockito创建单元测试。尝试为其中一个类成员提供模拟实例时遇到问题。

下面是要测试的类：

public class FeedbackServlet extends SlingAllMethodsServlet {
  @Reference
  private ConfigService configService;
  @Override
  protected void doPost(SlingHttpServletRequest request, SlingHttpServletResponse response) {
    FeedbackData feedbackData = extractFeedbackData(request.getRequestParameterMap());
    try {
      boolean isEmailSent = configService.send(feedbackData);
    } catch (Exception e) {
      ...
    }
  }
  private FeedbackData extractFeedbackData(RequestParameterMap data) {
    String firstName = data.getValue(ParamKey.FIRST_NAME.toString()).getString();
    String email = data.getValue(ParamKey.EMAIL.toString()).getString();
    String message = data.getValue(ParamKey.MESSAGE.toString()).getString();
    String contactNumber = data.getValue(ParamKey.CONTACT_NUMBER.toString()).getString();
    return new FeedbackData(firstName, email, message, contactNumber);
  }
}

当我尝试使用configService.send(feedbackData)时，测试会产生一个NullPointerException。现在我尝试在测试类中注入缺失值：

public class FeedbackServletTest extends Mockito {
  @InjectMocks
  private ConfigService configService = mock(ConfigService.class);
  @Test
  public void testDoPost() throws Exception {
    ...
    when(configService.send(new FeedbackData("Nikola", "[e-mail]", "Our virtues and our failings are inseparable, like force and matter." +
            "When they separate, man is no more.", "09991234567"))).thenCallRealMethod();
    ...
  }
}

我试图重新运行测试，但 NPE 仍然存在。

如何正确完成此操作？

Answer 1

@InjectMocks注释应放置在要测试的对象实例上。

@Mock
ConfigService mockedConfigService;
@InjectMocks
FeedbackServlet tested = new FeedbackServlet();