模拟 FeignCLient 时，Mockito.when() 在单元测试中不起作用答案

【问题标题】：Mockito.when() not working in a unit test when mocking FeignCLient模拟 FeignCLient 时，Mockito.when() 在单元测试中不起作用
【发布时间】：2021-01-08 12:43:57
【问题描述】：

我有一个 Component 类，如下所示：

@Component
@AllArgsConstructor
@NoArgsConstructor
@Slf4j
public class OutboundSystemTriggeredDirectAnalyzer implements BufferAccountAnalyzer {

    private FeignCustomerClient customerClient;
 

    @Override
    public void analyze(BankStatementTransaction bankStatementTransaction) {
        CustomerSummaryResponseDto customerSummary = new CustomerSummaryResponseDto();
        CustomerSummaryBankAccountRequestDto parsedAccountNumber = CustomerUtils
                .parseAccountNumber(bankStatementTransaction.getAccountNumber());
        try {
            customerSummary = customerClient
                    .getCustomerSummaryByBankAccount(parsedAccountNumber).getBody();
        } catch (Exception e) {
            log.error("Error on getting customer summary for bank account: {}", parsedAccountNumber);
        }

 
        CustomerIdentity customerIdentity = null;
        if (customerSummary != null && customerSummary.getProducts() != null) {
            customerIdentity = CustomerUtils.identifyCustomer(customerSummary);
        }
}

假客户是

@FeignClient(CUSTOMER_MANAGEMENT)
public interface FeignCustomerClient {
    

    @PostMapping(CUSTOMERS_PATH + SUMMARY + READ + BY_BANK_ACCOUNT)
    ResponseEntity<CustomerSummaryResponseDto> getCustomerSummaryByBankAccount(CustomerSummaryBankAccountRequestDto request);

}

我创建了一个测试

@RunWith(MockitoJUnitRunner.class)
public class OutboundSystemTriggeredDirectAnalyzerTest {


    @Mock
    private FeignCustomerClient customerClient;
    @Mock
    private FeignOldtransactionClient transactionClient;
    @InjectMocks
    private OutboundSystemTriggeredDirectAnalyzer analyzer;

    @Test
    public void matchCustomer() {
        BankStatementTransaction bankStatementTransaction = new BankStatementTransaction();
        bankStatementTransaction.setAccountNumber("31-046-006770124");
        CustomerSummaryBankAccountRequestDto parsedAccountNumber = new CustomerSummaryBankAccountRequestDto(31, 46, "6770124");

        CustomerSummaryResponseDto customerSummary = new CustomerSummaryResponseDto();
        BaseProductDto baseProductDto = new BaseProductDto(ProductType.LENDER, ProductSubType.PRIVATE, 32L);
        List<BaseProductDto> baseProducts = new ArrayList<>();
        baseProducts.add(baseProductDto);
        customerSummary.setProducts(baseProducts);

        WithdrawSearchRequestDto withdrawSearchRequestDto = new WithdrawSearchRequestDto();
        withdrawSearchRequestDto.setIsApproved(TRUE);
        withdrawSearchRequestDto.setLenderId(32L);

        TransactionResponseDto transactionDto = new TransactionResponseDto();
        transactionDto.setAmount(new BigDecimal("2000.00"));
        List<TransactionResponseDto> transactions = new ArrayList<>();
        transactions.add(transactionDto);

        Mockito.when(customerClient.getCustomerSummaryByBankAccount(parsedAccountNumber)).thenReturn(ResponseEntity.ok(customerSummary));
        Mockito.when(transactionClient.searchLenderWithdrawTransactions(1L, withdrawSearchRequestDto)).thenReturn(ResponseEntity.ok(transactions));

        analyzer.analyze(bankStatementTransaction);

        assertThat(bankStatementTransaction.getBankTransactionType().getId(), is(9L));

    }

}

我希望在调用 customerClient.getCustomerSummaryByBankAccount 时返回我在测试中创建的 customerSummary 对象，但是当我调试时 - 它不返回 customerSummary，但它是 Null。

【问题讨论】：

标签： java spring junit mockito

【解决方案1】：

我在 CustomerSummaryBankAccountRequestDto 类中看到了问题，因为对于 Mocks 的正确工作，输入参数应该相等，这意味着 CustomerSummaryBankAccountRequestDto 类不包含 equals 和 hashCode 用于在 Mockito.when() 中正确行为的方法条件。

类可以使用EqualsAndHashCode注解：

@EqualsAndHashCode
public class CustomerSummaryBankAccountRequestDto {
   ...
}

注意： 或者如果你已经实现了equals 和hashCode 方法（没有Lombok），这些方法工作不正确。

【讨论】：