java - 无法覆盖catch block 代码覆盖率

Question

我无法在 Junit 代码覆盖率中覆盖以下 HttpClientErrorException catch block 。我怎样才能做到这一点？

代码

@Autowired
private ExceptionHandlerService errorHandler;
public CartResponse callUpdateCart(AddToCartRequest request) {
        String url = Utils.formatHttpUrl(cartbaseUrl, CART_UPDATE_CART);
        try {

            HttpEntity<?> entity = new HttpEntity<>(request);
            JsonNode jsonNode = restTemplate.postForObject(url, entity, JsonNode.class);
            if (jsonNode.has(Constants.CONTENT) && !jsonNode.path(Constants.CONTENT).path(Constants.PAYLOAD).isMissingNode()) {
                    jsonNode = jsonNode.path(Constants.PAYLOAD).get(Constants.PAYLOAD);
            } else {
                errorHandler.error(ErrorMessages.EPO_VALIDATEQ_ERROR_08, jsonNode);
            }
            
            return JsonService.getObjectFromJson(jsonNode, CartResponse.class);
        } catch (HttpClientErrorException e) {
            errorHandler.error(ErrorMessages.EPO_VALIDATEQ_ERROR_08, e.getResponseBodyAsString());
            return null;
        } catch (HttpServerErrorException e) {
            throw new ServiceException(ErrorMessages.EPO_SYSTEM_ERROR, e.getMessage(), url);
        }
    }

异常处理服务

@Override
    public void error(ResolvableErrorEnum error, String responseBody) {
        JsonNode response = JsonService.getObjectFromJson(responseBody, JsonNode.class);
        if (null != response && null != response.get(Constants.ERROR)) {
            ServiceError serviceError = JsonService.getObjectFromJsonNode(response.get(Constants.ERROR), ServiceError.class);
            error(error, serviceError.getErrorId(), serviceError.getMessage());
        }
        
        throw new ServiceException(error);
    }

junit

@Test(expected = ServiceException.class)
    public void test_callUpdateCart_Exception() throws IOException {
        AddToCartRequest req = createAddToCartRequest();

        String responseBodyStr = "{\"error\":{\"errorId\":\"Service-I-1003\",\"message\":\"Error returned from downstream system.\",\"traceCode\":\"CART;400\",\"details\":[{\"code\":\"400\",\"message\":\"400 Bad Request\"},{\"code\":\"DTV_CAT_ERR_002\",\"message\":\"Error in getting response from catalog.\",\"traceCode\":\"CART;400\"}]}}\r\n";
        byte[] body = responseBodyStr.getBytes(StandardCharsets.UTF_8);
        HttpClientErrorException e = new HttpClientErrorException(HttpStatus.BAD_REQUEST, "BAD REQUEST", body,
                StandardCharsets.UTF_8);

        when(restTemplate.postForObject(Mockito.anyString(), Mockito.<HttpEntity<?>>any(), Mockito.eq(JsonNode.class)))
                .thenThrow(e);
        client.callUpdateCart(req);
    }

错误

Answer 1

似乎 mockito.when() 无法正常工作，因为它看起来没有抛出您要求它抛出的异常。我也遇到过类似的问题，用mockito匹配器修补通常可以解决这些问题。

您可以查看this page有关“扩展”或限制参数匹配器的更多信息。

我认为以下解决方案可行:

when(restTemplate.postForObject(Mockito.anyString(), Mockito.any(HttpEntity.class), Mockito.any(JsonNode.class)))
    .thenThrow(e);