@Test
    public void add() {
        TodoDTO formObject = TodoTestUtil.createFormObject(null, TodoTestUtil.DESCRIPTION, TodoTestUtil.TITLE);

        Todo model = TodoTestUtil.createModel(TodoTestUtil.ID, TodoTestUtil.DESCRIPTION, TodoTestUtil.TITLE);
        when(serviceMock.add(formObject)).thenReturn(model);

        MockHttpServletRequest mockRequest = new MockHttpServletRequest("POST", "/todo/add");
        BindingResult result = bindAndValidate(mockRequest, formObject);

        RedirectAttributesModelMap attributes = new RedirectAttributesModelMap();

        initMessageSourceForFeedbackMessage(TodoController.FEEDBACK_MESSAGE_KEY_TODO_ADDED);

        String view = controller.add(formObject, result, attributes);

        verify(serviceMock, times(1)).add(formObject);
        verifyNoMoreInteractions(serviceMock);

        String expectedView = TodoTestUtil.createRedirectViewPath(TodoController.REQUEST_MAPPING_TODO_VIEW);
        assertEquals(expectedView, view);

        assertEquals(Long.valueOf((String) attributes.get(TodoController.PARAMETER_TODO_ID)), model.getId());

        assertFeedbackMessage(attributes, TodoController.FEEDBACK_MESSAGE_KEY_TODO_ADDED);
    }

 private BindingResult bindAndValidate(HttpServletRequest request, Object formObject) {
        WebDataBinder binder = new WebDataBinder(formObject);
        binder.setValidator(validator);
        binder.bind(new MutablePropertyValues(request.getParameterMap()));
        binder.getValidator().validate(binder.getTarget(), binder.getBindingResult());
        return binder.getBindingResult();
    }

private void initMessageSourceForFeedbackMessage(String feedbackMessageCode) {
        when(messageSourceMock.getMessage(eq(feedbackMessageCode), any(Object[].class), any(Locale.class))).thenReturn(FEEDBACK_MESSAGE);
    }

 public static String createRedirectViewPath(String path) {
        StringBuilder redirectViewPath = new StringBuilder();
        redirectViewPath.append("redirect:");
        redirectViewPath.append(path);
        return redirectViewPath.toString();
    }

private void assertFeedbackMessage(RedirectAttributes attributes, String messageCode) {
        assertFlashMessages(attributes, messageCode, TodoController.FLASH_MESSAGE_KEY_FEEDBACK);
    }