spring-mvc - 注释 Controller 的 Junit 测试

Question

我如何在我的 Controller 中测试以下方法

@RequestMapping(method = RequestMethod.POST)
    public String register(@Valid User user, BindingResult result) {

        if (result.hasErrors()) {
            return "users/registration";
        }

        // create user
        service.create(user);

        return "redirect:/";
    }

如何测试 @Valid 和 BindingResult？

public void testRegister() {
        try {
        request.setMethod("POST");
        request.setRequestURI("/users");
            request.setParameter("email", "bla@gmail.com");
        request.setParameter("prename", "Cyril");
        request.setParameter("surname", "bla");
        request.setParameter("password", "123");
        request.setParameter("repeat", "123");
        request.setParameter("birthdate", "2000-01-01");
        request.setParameter("city", "Baden");


            ModelAndView mAv = adapter.handle(request, response, usersController);

            assertEquals("redirect:/", mAv.getViewName());
        } catch (Exception e) {
            fail();
        }
    }

非常感谢

Answer 1

对于 @Valid 注释，这超出了单元测试的范围。您可以相信 Spring 框架会为您执行验证，适本地设置 BindingResult。

实际上，您只需要覆盖 result.hasErrors() 的 if 检查 - 为此，您应该模拟 BindingResult;这是使用 Mockito 的方法:

...
@Mock
private BindingResult mockBindingResult

@Before
public void setupTest() {
    MockitoAnnotations.initMocks(this);
    // While the default boolean return value for a mock is 'false',
    // it's good to be explicit anyway:  
    Mockito.when(mockBindingResult.hasErrors()).thenReturn(false);
}

@Test
public void shouldStayOnRegistrationPageIfBindingErrors() {
    // Simulate having errors just for this test:
    Mockito.when(mockBindingResult.hasErrors()).thenReturn(true);

    ModelAndView mav = controller.register(user, mockBindingResult);

    // Check that we returned back to the original form:
    assertEquals("users/registration", mav.getViewName());
}

我也发现使用 Cobertura 真的很好(尤其是 eCobertura Eclipse 插件)以直观地确认单元测试涵盖了每一行和分支。