spring MockMvc 测试模型属性

Question

I have a controller method for which i have to write a junit test

@RequestMapping(value = "/new", method = RequestMethod.GET)
public ModelAndView getNewView(Model model) {
    EmployeeForm form = new EmployeeForm()
    Client client = (Client) model.asMap().get("currentClient");
    form.setClientId(client.getId());

    model.addAttribute("employeeForm", form);
    return new ModelAndView(CREATE_VIEW, model.asMap());
}

Junit test using spring mockMVC

@Test
public void getNewView() throws Exception {
    this.mockMvc.perform(get("/new")).andExpect(status().isOk()).andExpect(model().attributeExists("employeeForm")
            .andExpect(view().name("/new"));
}

I am getting NullPointerException as model.asMap().get("currentClient"); is returning null when the test is run, how do i set that value using spring mockmvc framework

Answer 1

The response is given as string chain (I guess json format, as it is the usual rest service response), and thus you can access the response string via the resulting response in this way:

ResultActions result = mockMvc.perform(get("/new"));
MvcResult mvcResult = result.andExpect(status().isOk()).andReturn();
String jsonResponse = mvcResult.getResponse().getContentAsString();

And then you can access to the response via getResponse().getContentAsString(). If json/xml, parse it as an object again and check the results. The following code simply ensures the json contains string chain "employeeForm" (using asertJ - which I recommend)

assertThat(mvcResult.getResponse().getContentAsString()).contains("employeeForm")

Hope it helps...

Answer 2

As an easy work around you should use MockHttpServletRequestBuilder.flashAttr() in your test:

@Test
public void getNewView() throws Exception {
    Client client = new Client(); // or use a mock
    this.mockMvc.perform(get("/new").flashAttr("currentClient", client))
        .andExpect(status().isOk())
        .andExpect(model().attributeExists("employeeForm"))
        .andExpect(view().name("/new"));
}