RestTemplateJunit：無法呼叫“org.springframework.http.ResponseEntity.getBody()”，因為“response”為空

我有一個 Spring Boot 應用程式，它使用作業正常的其余模板對其他內部專案進行 API 命中，我正在為它撰寫單元測驗用例，但如果由于引發意外例外而失敗，則測驗用例：java.lang.NullPointerException：無法呼叫“org.springframework.http.ResponseEntity.getBody()”因為“回應”為空

服務

@Service
@Slf4j
public class DynamoDBServiceImpl implements DynamoDBService {

  private final RestTemplate restTemplate;
  private final HttpHeaders httpHeaders;
  private final String jwtHeader;
  private final String apiKeyHeader;
  private final String dynamodbSysApiKey;
  private final String fetchAdminGroupUrl;

  public DynamoDBServiceImpl(
      RestTemplate restTemplate,
      HttpHeaders httpHeaders,
      @Value("${header-name.jwt}") String jwtHeader,
      @Value("${header-name.api-key}") String apiKeyHeader,
      @Value("${dynamodb-sys-api-key}") String dynamodbSysApiKey,
      @Value("${dynamodb-fetch-admin-group-url}") String fetchAdminGroupUrl) {
    this.restTemplate = restTemplate;
    this.httpHeaders = httpHeaders;
    this.jwtHeader = jwtHeader;
    this.apiKeyHeader = apiKeyHeader;
    this.dynamodbSysApiKey = dynamodbSysApiKey;
    this.fetchAdminGroupUrl = fetchAdminGroupUrl;
  }

  @Override
  public List<AdminGroupDTO> getAllAdminGroups() {
    log.debug("Request to get admin group details with url : {}", fetchAdminGroupUrl);
    httpHeaders.set("Accept", MediaType.APPLICATION_JSON_VALUE);
    httpHeaders.setContentType(MediaType.APPLICATION_JSON);
    httpHeaders.setBearerAuth(CommonUtils.getHeaderFromCurrentHttpRequest(jwtHeader));
    httpHeaders.set(apiKeyHeader, dynamodbSysApiKey);

    HttpEntity<AdminGroupDTO> request = new HttpEntity<>(httpHeaders);
    ResponseEntity<List<AdminGroupDTO>> response =
        restTemplate.exchange(fetchAdminGroupUrl, HttpMethod.GET, request, new ParameterizedTypeReference<List<AdminGroupDTO>>() {});
    return response.getBody();
  }

}

測驗

@SpringBootTest(classes = Application.class)
public class DynamoDBServiceTest {

  private final RestTemplate restTemplate = Mockito.mock(RestTemplate.class);
  private final HttpHeaders httpHeaders = new HttpHeaders();
  private final DynamoDBServiceImpl dynamoDBService =
      new DynamoDBServiceImpl(
          restTemplate, httpHeaders, "Authorization" , "Api-Key", "fake", "https://fake.com");

  @Test
  void testGetAllAdminGroups() {
    List<AdminGroupDTO> adminGroupDTOList = new ArrayList<>();
    AdminGroupDTO adminGroupDTO = new AdminGroupDTO();
    adminGroupDTO.setAdminGroupId(1L);
    adminGroupDTO.setAdminGroupName("fake");
    adminGroupDTO.setCountryName("fake");
    adminGroupDTOList.add(adminGroupDTO);

    ResponseEntity<List<AdminGroupDTO>> responseEntity = new ResponseEntity<>(adminGroupDTOList, HttpStatus.OK);
    when(restTemplate.exchange(
        ArgumentMatchers.anyString(),
        ArgumentMatchers.any(HttpMethod.class),
        ArgumentMatchers.any(),
        ArgumentMatchers.<Class<List<AdminGroupDTO>>>any()))
        .thenReturn(responseEntity);

    assertDoesNotThrow(dynamoDBService::getAllAdminGroups);
  }

}

uj5u.com熱心網友回復：

替換這行代碼：

 when(restTemplate.exchange(
        ArgumentMatchers.anyString(),
        ArgumentMatchers.any(HttpMethod.class),
        ArgumentMatchers.any(),
        ArgumentMatchers.<Class<List<AdminGroupDTO>>>any()))
        .thenReturn(responseEntity);

有了這個 ：

when(restTemplate.exchange(
            ArgumentMatchers.anyString(),
            ArgumentMatchers.any(HttpMethod.class),
            ArgumentMatchers.any(),
            ArgumentMatchers.eq(new ParameterizedTypeReference<List<AdminGroupDTO>>() {}))
    )
            .thenReturn(responseEntity);

例外應該消失。

有關更多詳細資訊，您可以查看此帖子。

標籤：爪哇 春天 弹簧靴 朱尼特 休息模板

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