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我有一个看起来像这样的类：

class Service {
    private final Logger lgr = LoggerFactory.getLogger(Service.class);

    public void doService() {
        lgr.info("Do Service");
    }
}

public class Controller {
    private final Logger lgr = LoggerFactory.getLogger(Controller.class);

    @Autowired
    private Service service;

    protected void doSomething() {
        //do something
        lgr.info("LOG something"); // lgr line
        // do something else

    }
}

对应的测试类如下所示：

@RunWith(PowerMockRunner.class)
@PrepareForTest({ControllerTest.class, LoggerFactory.class})
public class ControllerTest {
    private Controller controller;

    @Mock
    private Service service;

    @Before
    public void init() {
        controller = Mockito.mock(Controller.class, Mockito.CALLS_REAL_METHODS);
    }

    @Test
    public void testDoSomething() {
        controller.doSomething();  // calling doSomething method of Controller class
        // some other statements
    }
}

在这里，当调用到 doSomething() 方法时，在lgr line 行，lgr 对象为 null，因此我的单元测试因 NullPointerException 而失败。

有人可以帮我解决这个问题吗？

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