我可以在 java 方法中模拟 rest 调用吗

Question

我有 2 个方法，我想调用第一个公共方法，它又会调用一个私有方法，在私有方法中我想调用外部服务并从那里的 GET 请求中模拟 500 内部服务错误. 我知道如何模拟整个私有方法，但这不起作用我想看看那里发生了什么，特别是当我从外部服务获得 500 时。

这是我正在测试的两种方法的样子..

@Resource(name = "serviceRestTemplate")
private OAuth2RestTemplate serviceRestTemplate;

public ResponseEntity<Cargo> getById(String id) throws MyException {

    UriComponentsBuilder newUri = UriComponentsBuilder
            .fromHttpUrl(url + id + HEADER_URI);
    ResponseEntity<String> responseEntity = this.callNewService(newUri, HttpMethod.GET);
    // more irrelivent code...
}

private ResponseEntity<String> callNewService(UriComponentsBuilder uriBuilder, HttpMethod method) throws MyException {

    ResponseEntity<String> responseEntity = null;
    try {
        HttpHeaders headers = new HttpHeaders();
        headers.setContentType(MediaType.APPLICATION_JSON);
        HttpEntity<String> requestEntity = new HttpEntity<>(headers);

        responseEntity = serviceRestTemplate.exchange(uriBuilder.toUriString(),
                method, requestEntity, String.class);

    }catch(HttpClientErrorException httpClientErrorException) {
        LOGGER.error("Error when calling Service. {} ", uriBuilder.toUriString());
        LOGGER.error("Error message from HttpClientErrorException . {} ", httpClientErrorException.getMessage());
        throw buildException(httpClientErrorException.getMessage(), httpClientErrorException.getRawStatusCode());
    }

    if(null != responseEntity
            && responseEntity.getStatusCode().is2xxSuccessful()
            && EDMRESTServiceUtilities.isJsonValid(responseEntity.getBody())) {
        LOGGER.info("Service response: {}", responseEntity.getBody());
        return responseEntity;
    }else {
        LOGGER.error("Error response from Service. {} ", uriBuilder.toUriString());
        throw buildException(SERVICE_ERROR_MESSAGE, HttpStatus.INTERNAL_SERVER_ERROR.value());
    }
}

Answer 1

您可以模拟您的serviceRestTemplate和测试中的exchange调用，并将您的注入方法更改为构造函数注入，这将使您更容易在 class 中使用模拟。