这个问题与此有关。一旦发现问题，并成功应用了建议的解决方案，我将继续开发和重构代码，直到达到这一点为止。

如您在以下代码中看到的，我为我在控制器中实例化的服务类定义了一个Bean
GetExchangeRate，因此我将其直接注入控制器中，避免注入其依赖项（ExchangeRateView其实现使用的存储库JdbcTemplate）。然后，我重构了我的测试，所以我不需要模拟ExchangeRateView而是GetExchangeRate相反。但是，这样做之后我遇到了Application failed to start错误，抱怨

com.fx.exchangerate.store.infrastructure.persistence.read.ExchangeRateJdbcView中的构造函数的参数0需要类型为’org.springframework.jdbc.core.JdbcTemplate’的bean

在我看来，尽管我嘲笑GetExchangeRate过@MockBean注释，它仍试图从应用程序上下文获得它的依赖，因为它运行正常，每当我添加@MockBean ExchangeRateView exchangeRateView到测试类。

所以我的问题是，是否@MockBean真的这样？模拟类是否仍然需要注入其依赖项？我在这里想念什么吗？

控制器：

@RestController
public class ExchangeRateStoreController {
    private AddExchangeRateRequestAdapter addExchangeRateRequestAdapter;
    private GetExchangeRate getExchangeRate;
    private CommandBus commandBus;

    @Autowired
    public ExchangeRateStoreController(CommandBus commandBus, GetExchangeRate getExchangeRate) {
        addExchangeRateRequestAdapter = new AddExchangeRateRequestAdapter();
        this.commandBus = commandBus;
        this.getExchangeRate = getExchangeRate;
    }

    @GetMapping
    public ExchangeRate get(@RequestBody GetExchangeRateRequest getExchangeRateRequest) {
        GetExchangeRateQuery query = new GetExchangeRateQuery(getExchangeRateRequest.from, getExchangeRateRequest.to, getExchangeRateRequest.date);
        return getExchangeRate.execute(query);
    }

    @PostMapping
    @ResponseStatus(HttpStatus.CREATED)
    public void create(@RequestBody AddExchangeRateRequest addExchangeRateRequest) {
        commandBus.dispatch(addExchangeRateRequestAdapter.toCommand(addExchangeRateRequest));
    }
}

测试：

@RunWith(SpringRunner.class)
@WebMvcTest(ExchangeRateStoreController.class)
public class ExchangeRateStoreControllerTest {

    @Autowired
    private MockMvc mvc;
    @MockBean
    ExchangeRateRepository exchangeRateRepository;
    @MockBean
    ExchangeRateDateValidator exchangeRateDateValidator;
    @MockBean
    GetExchangeRate getExchangeRate;

    @Test
    public void givenValidAddExchangeRateRequest_whenExecuted_thenItReturnsAnHttpCreatedResponse() throws Exception {
        String validRequestBody = "{\"from\":\"EUR\",\"to\":\"USD\",\"amount\":1.2345,\"date\":\"2018-11-19\"}";

        doNothing().when(exchangeRateDateValidator).validate(any());
        doNothing().when(exchangeRateRepository).save(any());

        mvc.perform(post("/").content(validRequestBody).contentType(MediaType.APPLICATION_JSON))
                .andExpect(status().isCreated());
    }

    @Test
    public void givenGetExchangeRateRequestThatMatchesResults_whenExecuted_thenItReturnsOkResponseWithFoundExchangeRate() throws Exception {
        when(getExchangeRate.execute(any(GetExchangeRateQuery.class))).thenReturn(anExchangeRate());
        mvc.perform(get("/")
                .content("{\"from\":\"EUR\",\"to\":\"USD\",\"date\":\"2018-11-19\"}")
                .contentType(MediaType.APPLICATION_JSON))
                .andExpect(status().isOk());
    }
}

应用服务：

public class GetExchangeRate {

    private ExchangeRateView view;
    private Clock clock;

    public GetExchangeRate(ExchangeRateView view, Clock clock) {
        this.view = view;
        this.clock = clock;
    }

    // More methods here
}

仓库实施类别：

@Repository
public class ExchangeRateJdbcView implements ExchangeRateView {

    JdbcTemplate jdbcTemplate;

    @Autowired
    public ExchangeRateJdbcView(JdbcTemplate jdbcTemplate) {
        this.jdbcTemplate = jdbcTemplate;
    }

    // More methods here
}

配置类：

@Configuration
public class ExchangeRateStoreConfig {

    @Bean
    @Autowired
    public GetExchangeRate getExchangeRate(ExchangeRateView exchangeRateView, Clock clock) {
        return new GetExchangeRate(exchangeRateView, clock);
    }

    @Bean
    public Clock clock() {
        return new Clock();
    }

    // More bean definitions
}