@Mock Injection @InjectMocks in Spring Boot + Mockito + JUnit fails

Problem Description

The test code is as follows:

@RunWith(SpringRunner.class)
@SpringBootTest
public class CheckConfirmPayServiceTest {

    private static final Logger logger = LoggerFactory.getLogger(CheckConfirmPayServiceTest.class);

    @Mock
    private CashierService cashierService;

    @Autowired
    @InjectMocks // The class injected into the mock object is generally the class being tested
    private CheckConfirmPayService checkConfirmPayService;

    @Autowired
    private TScanStatementJobMapper tScanStatementJobMapper;


    private String jobFlowNo = FlowNoUtil.getTxNo();

    private String sysOrderNo = "S" + FlowNoUtil.getTxNo();

    @Before
    public void setUp() throws Exception {
        // Mock
        MockitoAnnotations.initMocks(this);
        Mockito.doAnswer(new Answer<Object>() {
            @Override
            public Object answer(InvocationOnMock invocation) {
                Object[] args = invocation.getArguments();
                CashierCheckConfirmPayRequest request = (CashierCheckConfirmPayRequest) args[0];
                logger.info("===== Mock interface test =" = ");
                CashierCheckConfirmPayResponse response = new CashierCheckConfirmPayResponse();
                if (request == null) {
                    throw new BizException(ErrorCodeEnum.NULL_POINTER_EXCEPTION.code,
                            ErrorCodeEnum.NULL_POINTER_EXCEPTION.msg);
                }
                response.setReqsysNo(request.getReqsysNo());
                response.setVersion(request.getVersion());
                return response;
            }
        }).when(cashierService).checkConfirmPay(Mockito.any(CashierCheckConfirmPayRequest.class));
        insertTScanStatementJob();
    }

    /**
           * Insert reconciliation status data
     *
     * @author shenhaiwen
     * @time  August 27, 2018, 2:12:31 PM
     */
    private void insertTScanStatementJob() {
        String checkDate = TimeUtil.addDays(-1); // the day before the current date
        TScanStatementJob job = new TScanStatementJob();
        job.setJobFlowNo(jobFlowNo);
        job.setCheckDate(checkDate);
        job.setStatementFlag(StatementFlagEnum.FINISH.getCode());
        job.setCreateTime(TimeUtil.getTimeStamp());
        job.setUpdateTime(TimeUtil.getTimeStamp());
        job.setRemark("Unit Test Data");
        tScanStatementJobMapper.insert(job);
    }

    @After
    public void delData() {
        tScanStatementJobMapper.deleteByPrimaryKey(jobFlowNo);
    }

    /**
           * Batch processing to confirm payment scenarios
     *
     * @author shenhaiwen
     * @time  August 4, 2018, 11:26:16 AM
     */
    @Test
    public void testRemoteCheckConfirmPay() {
        CallBackStatusEnum callBackStatusEnum = null;
        try {
            callBackStatusEnum = checkConfirmPayService.remoteCheckConfirmPay();
        } catch (Exception e) {
            TestCase.fail();
        }
        TestCase.assertEquals(CallBackStatusEnum.SUCCESS.getStatus(), callBackStatusEnum.getStatus());

    }

In the test class, mock the CashierService object and inject it into checkConfirmPayService, and then execute the CashierService method in the test method.

But now the problem is that the cashierService attribute of checkConfirmPayService is not injected by the @Mock tag, but the @Autowired tag is called, using the bean generated by spring instead of the cashierService of the mock.

The results are as follows:

problem causes

The current version only supports setter injection. Mockito first attempts type injection. If there are multiple mock objects of the same type, it will be injected based on the name. Mockito will not throw any exception when the injection fails, so you may need to manually verify its security.

Therefore, the cashierService needs to be injected in checkConfirmPayService using setter. The sample code is as follows:

@Before
    public void setUp() throws Exception {
        // Mock
        MockitoAnnotations.initMocks(this);
        checkConfirmPayService.setCashierService(cashierService);
        ............

The test entered the cashierService's mock as expected, as follows:

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