如何输入和测试 catch 子句。 Spring-boot，Junit，Mockito

Question

我正在尝试测试以下代码部分。尤其是抓住：

try {
    preAuthCompleteResponse = preAuthCompleteClient
            .getPreAuthCompleteResponse(preAuthCompleteServiceImpl.getPreAuthComplete(
                    preAuthCompleteRequestServiceImpl.getPreAuthCompleteRequest(preAuthCompleteModel)));
    } catch (IOException | MarshalSendAndReceiveException e) {
        logger.error(e.getMessage(), e);
        return new ResponseEntity<>(
                new SvsTransactionResponseModel(HttpStatus.BAD_REQUEST, e.getMessage()),
                HttpStatus.BAD_REQUEST);
    }

在一个测试中，我希望 IOException 被捕获，而在另一个测试中，我希望 MarshalSendAndReceiveException 被捕获。然后两者都返回SvsTransactionResponseModel，状态为HttpStatus.BAD_REQUEST。

preAuthCompleteClient.getPreAuthCompleteResponse 方法抛出 MarshalSendAndReceiveException 和 preAuthCompleteRequestServiceImpl.getPreAuthCompleteRequest 抛出 IOException。

我的测试是这样的：

@RunWith(MockitoJUnitRunner.class)
public class PreAuthCompleteControllerTest {

    @Mock
    private PreAuthCompleteService preAuthCompleteServiceImpl;
    @Mock
    private PreAuthCompleteRequestService preAuthCompleteRequestServiceImpl;
    @Mock
    private PreAuthCompleteClient preAuthCompleteClient;
    @Mock
    private Errors errors;

    private PreAuthCompleteController preAuthCompleteController;

    @Before
    public void setUp() {
        preAuthCompleteController = new PreAuthCompleteController(preAuthCompleteServiceImpl,
                preAuthCompleteRequestServiceImpl, preAuthCompleteClient);
    }

    @Test
    public void testGetPreAuthCompleteExpectIOException() throws MarshalSendAndReceiveException, IOException {
        when(preAuthCompleteClient.getPreAuthCompleteResponse(preAuthCompleteServiceImpl.getPreAuthComplete(
                preAuthCompleteRequestServiceImpl.getPreAuthCompleteRequest(new PreAuthCompleteModel()))))
                        .thenReturn(new PreAuthCompleteResponse());

        ResponseEntity<SvsTransactionResponseModel> responseEntity = (ResponseEntity<SvsTransactionResponseModel>) preAuthCompleteController
                .getPreAuthComplete(null, errors);
        assertTrue(responseEntity.getBody() != null);
        assertTrue(responseEntity.getStatusCodeValue() == 400);
    }

}

我使用 Mockito.when、Mockito.thenThrow 或 doThrow 等尝试了不同的解决方案。但有不同的例外或不成功的测试。我没主意了。

如何测试异常被捕获并且 ResponseEntity 正确返回。

附：所有的模拟配置工作。

Answer 1

为了帮助理解我打断了这个电话的事情......

preAuthCompleteResponse = preAuthCompleteClient
      .getPreAuthCompleteResponse(preAuthCompleteServiceImpl.getPreAuthComplete(
        preAuthCompleteRequestServiceImpl.getPreAuthCompleteRequest(preAuthCompleteModel)));

... 分解成它的组成部分：

PreAuthCompleteRequest preAuthCompleteRequest = preAuthCompleteRequestServiceImpl.getPreAuthCompleteRequest(preAuthCompleteModel);

PreAuthComplete preAuthComplete = preAuthCompleteServiceImpl.getPreAuthComplete(preAuthCompleteRequest);

PreAuthCompleteResponse preAuthCompleteResponse = preAuthCompleteClient.getPreAuthCompleteResponse(preAuthComplete);

我猜测返回类型（PreAuthCompleteRequest、PreAuthComplete 等），但你明白了（我认为 :)。鉴于上述调用顺序，应通过以下测试：

@Test
public void badRequestWhenPreAuthCompleteResponseFails() {
    // preAuthCompleteController.getPreAuthComplete() invokes 
    //    preAuthCompleteClient.getPreAuthCompleteResponse() 
    // and any MarshalSendAndReceiveException throw by that client should result in a BAD_REQUEST
    MarshalSendAndReceiveException expectedException = new MarshalSendAndReceiveException("boom!");
    when(preAuthCompleteClient.getPreAuthCompleteResponse(Mockito.any(PreAuthComplete.class))).thenThrow(expectedException);


    ResponseEntity<SvsTransactionResponseModel> responseEntity = (ResponseEntity<SvsTransactionResponseModel>) preAuthCompleteController
            .getPreAuthComplete(null, errors);
    assertTrue(responseEntity.getBody() != null);
    assertTrue(responseEntity.getStatusCodeValue() == 400);
}

@Test
public void badRequestWhenPreAuthCompleteRequestFails() {
    // preAuthCompleteController.getPreAuthComplete() invokes
    //    preAuthCompleteClient.getPreAuthCompleteResponse() which then invokes
    //    preAuthCompleteServiceImpl.getPreAuthComplete() which then invokes 
    //    preAuthCompleteRequestServiceImpl.getPreAuthCompleteRequest
    // and any IOException throw by that call should result in a BAD_REQUEST

    IOException expectedException = new IOException("boom!");
    when(preAuthCompleteRequestServiceImpl.getPreAuthCompleteRequest(Mockito.any(PreAuthCompleteModel.class))).thenThrow(expectedException);

    ResponseEntity<SvsTransactionResponseModel> responseEntity = (ResponseEntity<SvsTransactionResponseModel>) preAuthCompleteController
            .getPreAuthComplete(null, errors);
    assertTrue(responseEntity.getBody() != null);
    assertTrue(responseEntity.getStatusCodeValue() == 400);
}