java - Spring Controller 单元测试抛出 NestedServletException

Question

我有一个 Spring Controller ，它在没有数据时抛出错误。我想测试异常，这是自定义 NoDataFoundException ，但它总是抛出 org.springframework.web.util.NestedServletException
单元测试错误信息是:java.lang.Exception: Unexpected exception, expected<com.project.NoDataFoundException> but was<org.springframework.web.util.NestedServletException>
Controller 单元测试

@RunWith(SpringRunner.class)
@ContextConfiguration(classes = {MockConfiguration.class})
@WebAppConfiguration
public class ModelControllerTest{

    private MockMvc mockMvc;

    @Inject
    private ModelController controller;

    @Inject
    private ResponseBuilder responseBuilder;

    @Before
    public void setUp() {
        mockMvc = MockMvcBuilders.standaloneSetup(controller).build();
    }

    @Test(expected = NoDataFoundException.class)
    public void findAllModels_invalidRequest_throwNoDataFound() throws Exception {
        when(responseBuilder.findAll(any())).thenReturn(null);
        mockMvc
        .perform(get("/models"))
            .andExpect(status().isInternalServerError());
    }

}

Controller

@GetMapping("/models")
public ResponseEntity<List<Model>> findAllModels() {
    //Some Logic 
    dataExistenceCheck(response);
    return new ResponseEntity<>(response, HttpStatus.OK);
}

private <T> void dataExistenceCheck(T target) {
    if (target == null || (target instanceof Collection && ((Collection<?>) target).isEmpty())) {
        throw new NoDataFoundException();
    }
}

NoDataFoundException 类

public class NoDataFoundException extends RuntimeException {

    private static final long serialVersionUID = 140836818081224458L;

    public NoDataFoundException() {
        super();
    }

    public NoDataFoundException(String message) {
        super(message);
    }

}

寻找

我调试了代码并跟踪到 org.springframework.web.servlet.FrameworkServlet类(class)。是的，我期待 NoDataFoundException但它在那里抛出 NesteServletException .

我该如何解决？我做错了什么？



编辑问题

我有 @ControllerAdvice和处理 NoDataFoundException ，但它命中 NestedServletException在到达这里之前。

@ResponseBody
@ResponseStatus(value = HttpStatus.NOT_FOUND)
@ExceptionHandler(NoDataFoundException.class)
public ResponseEntity<ErrorResponse> noDataFoundExceptionHandler(NoDataFoundException exception) {
    LOGGER.debug("No data found exception [{}].", exception);
    return new ResponseEntity<>(new ErrorResponse("not found"), HttpStatus.NOT_FOUND);
}   

Answer 1

NestedServletException是一个包装器/适配器，它采用了 javax.servlet.ServletException 的所有异常(exception)情况.它是 java servlet API 的一部分。

您可以通过以下方式解决:

1) catch NestedServletException并重新抛出原因:

try {
    mockMvc
    .perform(get("/models"))
        .andExpect(status().isInternalServerError());
} catch (NestedServletException e) {
    throw e.getCause();
}

2) 使用 org.assertj.core.api.Assertions.assertThatThrownBy

@Test
public void findAllModels_invalidRequest_throwNoDataFound() throws Throwable {
    Assertions.assertThatThrownBy(() ->
            mockMvc.perform(get("/models")).andExpect(status().isInternalServerError()))
            .hasCause(new NoDataFoundException(null));
}

3) 在您的 Controller 或全局异常处理程序中添加 @ExceptionHandler(NoDataFoundException.class)并将其转换为有效的 Http 代码和响应正文。

4) 扩展 NoDataFoundException来自 ServletException