java - Mockito org.mockito.exceptions.misusing.InvalidUseOfMatchersException : Invalid use of argument matchers! 预期 0 个匹配器，记录 1 个:

Question

首先，我尝试为远程服务编写单元测试来获取天气并使用restTemplate，然后实现 ClientHttpRequestInterceptor为了获取远程请求和远程响应以进行日志记录，现在我尝试模拟restTemplate来编写单元测试并得到以下错误

When using matchers, all arguments have to be provided by matchers.
For example:
    //correct:
    someMethod(anyObject(), eq("String by matcher"));

For more info see javadoc for Matchers class.

and here you here code i wrote for unit-test

@RunWith(MockitoJUnitRunner.class)
public class WeatherRemoteServiceTest {

    @Mock CustomResttemplate restTemplate;

    @Mock WeatherRemoteUtilies weatherUtilies;

    @InjectMocks WeatherRemoteService weatherRemote;

    @Test
    public void testRetrieveWeather() {

        ResponseEntity<String> MockResponse= new ResponseEntity<String>(HttpStatus.OK);

        Mockito.when(weatherUtilies.buildRequestParams(Mockito.anyString()))
                        .thenReturn(Mockito.any(MultiValueMap.class));
        ResponseEntity<String> responseEntity = new ResponseEntity<String>("sampleBodyString", HttpStatus.OK);
        Mockito.when(restTemplate.buildRestTemplate().exchange(
                                   Matchers.anyString(), 
                                   Matchers.any(HttpMethod.class),
                                   Matchers.<HttpEntity<?>> any(), 
                                   Matchers.<Class<String>> any()
                                  )
                                 ).thenReturn(responseEntity);
        assertEquals(weatherRemote.retrieveWeather("ciaro").getStatusCode(), HttpStatus.OK);
    }

}

这是业务逻辑本身的代码

@Service
public class WeatherRemoteService {

    private final Logger logger= LoggerFactory.getLogger(this.getClass());

    @Value("${openweather.url}")
    private String url;

    @Autowired
    private WeatherRemoteUtilies weatherUtilies;

    @Autowired
    private CustomResttemplate customRestTemplate;

    public ResponseEntity<?> retrieveWeather(String city) {

        logger.info(Constants.CLASS_NAME+this.getClass().getName()+Constants.METHOD_NAME+new Object() {}.getClass().getEnclosingMethod().getName());
        logger.debug(Constants.METHOD_ARGUMENTS+city);
        RestTemplate restRequest= customRestTemplate.buildRestTemplate();
        HttpHeaders headers= new HttpHeaders();
        headers.set("Accept",MediaType.APPLICATION_JSON_UTF8_VALUE);
        UriComponentsBuilder uri= UriComponentsBuilder.fromUriString(url).
                path("/data/2.5/weather")
                .queryParams(weatherUtilies.buildRequestParams(city));
        HttpEntity<String>entity= new HttpEntity<>(headers);
        ResponseEntity<String>WeatherResponse=restRequest.exchange(uri.toUriString(), HttpMethod.GET, entity, String.class);
        logger.info(Constants.END_METHOD);
        return WeatherResponse;
    }



}

代码RestTemplateInterceptor

public class RestTemplateInterceptor implements ClientHttpRequestInterceptor {

    private final Logger logger =LoggerFactory.getLogger(this.getClass());

    @Override
    public ClientHttpResponse intercept(HttpRequest request, byte[] body, ClientHttpRequestExecution execution)
            throws IOException {
        logRequest(request, body);
        ClientHttpResponse httpResponse= execution.execute(request, body);
        logResponse(httpResponse);
        return httpResponse;
    }

    private void logRequest(HttpRequest request, byte[] body) throws IOException {
        logger.info(Constants.START_REMOTE_REQUEST);
        logger.info("URI            :{}", request.getURI().toString());
        logger.info("Method         :{}", request.getMethod().toString());
        logger.info("Headers        :{}", request.getHeaders().toString());
        logger.info("Request body   :{}", new String(body,"UTF-8").toString());
        logger.info(Constants.END_REMOTE_REQUEST);
    }

    private void logResponse(ClientHttpResponse response) throws IOException {
        logger.info(Constants.START_REMOTE_RESPONSE);
        logger.info("Status code    :{}", response.getStatusCode().toString());
        logger.info("Status text    :{}", response.getStatusText().toString());
        logger.info("Headers        :{}", response.getHeaders().toString());
        logger.info("Response body  :{}", StreamUtils.copyToString(response.getBody(), Charset.defaultCharset()));
        logger.info(Constants.END_REMOTE_RESPONSE);
    }
}

然后使用以下代码在 RestTemplate 工厂上 setInterceptor

public class CustomResttemplate {

    public RestTemplate buildRestTemplate() {
        SimpleClientHttpRequestFactory simpleFactory= new SimpleClientHttpRequestFactory();
        simpleFactory.setOutputStreaming(false);
        ClientHttpRequestFactory factory = new BufferingClientHttpRequestFactory(simpleFactory);

        RestTemplate restTemplate= new RestTemplate(factory);
        restTemplate.setInterceptors(Collections.singletonList(new RestTemplateInterceptor()));

        return restTemplate;
    }
}

Answer 1

你的问题在于你写的地方

.thenReturn(Mockito.any(MultiValueMap.class))

您实际上必须告诉 Mockito 要返回什么。您不能在这里使用匹配器。匹配器用于验证并设置要 stub 的条件。您不能使用它们来告诉 Mockito 从 stub 调用中返回什么。

创建一个特定的MultiValueMap以传递给thenReturn。