对RestTemplate.exchange()方法进行模拟，得到空值。

Question

mocking RestTemplate.exchange()无法工作。restTemplate.exchange() mocking的Response在BDS Adapter类中给出了null值。我的测试用例在BDSAdapter类中以null pointer异常失败。(response.getStatusCodeValue()给出null pointer异常......Mockito提示。

未使用... -> at com.policyydetails_adapters.BDSAdapterTest.getInsuranceHoldings(BDSAdapterTest.java:56) [MockitoHint] ...args ok? -> at com.policyydetails_adapters.BDSAdapter.fetchInsuranceDetails(BDSAdapter.java:77)

 Below are my classes.

测试班

@RunWith(MockitoJUnitRunner.class)
public class BDSAdapterTest {

    @InjectMocks
    private BDSAdapter bdsAdapter;

    @Mock
    private BDSFetchInsuranceDetailsRequest bdsFetchInsuranceDetailsRequest;

    @Mock
    private RestTemplate restTemplate;

    @Mock
    Environment env;

    @Test
    public void getInsuranceHoldings() throws InsuranceHoldingsException {
        Mockito.when(restTemplate.exchange(
                ArgumentMatchers.anyString(),
                ArgumentMatchers.any(HttpMethod.class),
                ArgumentMatchers.any(),
                ArgumentMatchers.<Class<BDSFetchInsuranceDetailsResponse>>any()))
                             .thenReturn(sampleBDSCustomerInsuranceHoldings());
        BDSFetchInsuranceDetailsResponse bdsFetchInsuranceDetailsResponse = bdsAdapter.fetchInsuranceDetails("MBSG", "S6564318I", "1234", "007");
        assertNotNull("response is not null", bdsFetchInsuranceDetailsResponse);
    }


    public static ResponseEntity<BDSFetchInsuranceDetailsResponse> sampleBDSCustomerInsuranceHoldings() {
        BDSFetchInsuranceDetailsResponse bdsResponse = new BDSFetchInsuranceDetailsResponse();
        Header header = new Header();
        header.setChannelId("MBSG");
        header.setMsgId("4aBE50ZrQtjVuXfTyALJ");
        bdsResponse.setHeader(header);
        ResponseEntity<BDSFetchInsuranceDetailsResponse> response = new ResponseEntity<BDSFetchInsuranceDetailsResponse>(bdsResponse, HttpStatus.ACCEPTED);
        return response;
    }

}

我的实际班级

@Componentpublic class BDSAdapter {

@Autowired
RestTemplate restTemplate;

@Autowired
BDSFetchInsuranceDetailsRequest bdsFetchInsuranceDetailsRequest;

@Autowired
Environment env;


public BDSFetchInsuranceDetailsResponse fetchInsuranceDetails(String channelId, String customerId,
        String insurerCode, String policyNumber) throws InsuranceHoldingsException {
    BDSFetchInsuranceDetailsResponse bdsFetchInsuranceDetailsResponse = null;
    try {
        logger.info("Inside BDSAdapter::fetchInsuranceDetails");
        Header header = new Header();
        header.setMsgId(RandomStringUtils.randomAlphanumeric(20));
        header.setChannelId(channelId);
        bdsFetchInsuranceDetailsRequest.setHeader(header);

        HttpHeaders requestHeaders = new HttpHeaders();

        requestHeaders.add("Accept", MediaType.APPLICATION_JSON_VALUE);
        HttpEntity<BDSFetchInsuranceDetailsRequest> requestEntity = new HttpEntity<>(bdsFetchInsuranceDetailsRequest, requestHeaders);

        ResponseEntity<BDSFetchInsuranceDetailsResponse> response = restTemplate.exchange(env.getProperty("bds_fetch_insurance_details_url"),HttpMethod.POST, requestEntity, BDSFetchInsuranceDetailsResponse.class);

        if(response.getStatusCodeValue() == 204) {
            throw new InsuranceHoldingsException(response.getStatusCode().toString(), "No Content");
        }
        bdsFetchInsuranceDetailsResponse = response.getBody();

    } catch (Exception e) {
        e.printStackTrace();
        }
    }
    return bdsFetchInsuranceDetailsResponse;
}

}

Answer 1

也许，因为mock的 BDSFetchInsuranceDetailsResponse 将不返回一个类的 BDSFetchInsuranceDetailsResponse 但一些模拟班

Answer 2

restTemplate.exchange()方法中的Arugments应该匹配。在这段代码中，env.getProperty("bds_fetch_insurance_details_url")会返回 无效 与String不匹配。在When(restTemplate.exchange(-,-,-,-).thenReturn(myResponse))之前添加了以下语句。它是工作的

`Mockito.when(env.getProperty("bds_fetch_insurance_details_url")).thenReturn("anyString")`;