Spring Boot @Autowired by generic 不适用于 @InjectMocks

Question

我们知道 @Autowired 的主要优点不是对具体实现进行硬编码。看我的代码:

public interface GeneralDao<T> {
    T get(Long id);
}

@Component
public class BarDao implements GeneralDao<Bar> {
    @Override
    public Bar get(Long id) {
        Bar bar = new Bar(); // hardcode
        bar.setId(id);
        return bar;
    }
}

public interface GeneralService<T> {
    T get(Long id);
}

@Service
public class BarService implements GeneralService<Bar> {
    @Autowired
    private GeneralDao<Bar> barDao;

    @Override
    public Bar get(Long id) {
        return barDao.get(id);
    }
}

现在我正在尝试编写一个测试:

@RunWith(MockitoJUnitRunner.class)
public class BarServiceTest {
    @Mock
    private GeneralDao<Bar> barDao;

    @InjectMocks
    private GeneralService<Bar> barService;

    @Test
    public void get() {
        Bar bar = new Bar();
        bar.setId(1L);
        when(barDao.get(1L)).thenReturn(bar);

        Bar actualBar = barService.get(1L);
        assertThat(actualBar, equalTo(bar));
    }
}

但是这不起作用!为什么我什么时候写:

@InjectMocks private GeneralService<Bar> barService;

显示异常？仍然工作于:

@Mock private GeneralDao<Bar> barDao

我不想这样写:

@InjectMocks private BarService barService;

Answer 1

由于您必须测试 BarService，因此您可以通过指定实现类来完成，如下所示。

@InjectMocks private GeneralService<Bar> barService = new BarService(barDao);