我在我的类中有两个私有字段，我正在测试，这两个字段在构造函数中初始化。
现在，当我尝试使用我的类用@InjectMocks注解调用时，它会抛出异常：

Cannot instantiate @InjectMocks field named 'ServiceImpl' of type 'class com.test.ServiceImpl'. You haven't provided the instance at field declaration so I tried to construct the instance.

下面是一段代码。

public class ServiceImpl implements Service {

    private OfficeDAO officeDAO;

    private DBDAO dbDAO;

    public ServiceImpl() {
        officeDAO = Client.getDaoFactory().getOfficeDAO();
        dbDAO = Client.getDaoFactory().getDBDAO();
    }
}

我的测试类：

@RunWith(MockitoJUnitRunner.class)
public class ServiceImplTest {
    
    @Mock
    private OfficeDAO officeDAO;

    @Mock
    private DBDAO dbDAO;

    @Mock
    Client client;

    @InjectMocks
    private ServiceImpl serviceImpl;

    @Mock
    private Logger log;

    @Before
    public void setUp() throws Exception {
        MockitoAnnotations.initMocks(this);
    }
}

请帮助我如何解决它。任何帮助将不胜感激。