How to check JSON response in Spring MVC test

Question

I have a servlet defined in web.xml, so I defined it inside a Controller for testing only for MyResource:

 @Controller 
 public class TestMyServlet {

     MyResource servlet;

     @Autowired
     AutowireCapableBeanFactory beanFac;

     @PostConstruct
     void init() {
         servlet = new MyResource();
         beanFac.autowireBean(servlet);
     }

     @RequestMapping(value = "/servlet/api/update", method = RequestMethod.POST)
     public MyResponse handle(HttpServletRequest request, HttpServletResponse response, @RequestBody String json) {     
         return servlet.update(json);
     }

Then I test it using MockHttpServletRequestBuilder:

  MockHttpServletRequestBuilder mockHttpServletRequestBuilder = MockMvcRequestBuilders
    .post("/servlet/api/update")
    .content("{\"id\":1,\"toggle\":true}]")
    .session(httpSession)
    .contentType(MediaType.APPLICATION_JSON);
    MvcResult mvcResult = this.mockMvc.perform(mockHttpServletRequestBuilder)
              .andDo(MockMvcResultHandlers.print())
              .andReturn();
    ModelAndView modelAndView = mvcResult.getModelAndView().getModelMap();
    String response = mvcResult.getResponse().getContentAsString();

In servlet I don't use ModelAndView, just returning a POJO object (MyResponse) that is serialize to JSON response

I'm seeing MyResponse object as a second attribute in ModelAndView, but response is null

How can I check JSON string returned in this response?

Debug the code. See what's happening. Log the response or add logging and see where is it null — Sagar Kharab
– Sagar Kharab, Commented Feb 25, 2019 at 13:59
@SagarKharab in my code I'm only returning an object which is fine, the question is about how to test it using Spring MvcResult — Ori Marko
– Ori Marko, Commented Feb 25, 2019 at 14:01
maybe completely off topic, but is there a typo in @RequestMapping(value = "/servletapi/update" ? — Daniele
– Daniele, Commented Feb 25, 2019 at 14:30
@Daniele only typo, my endpoint working and returning POJO successfully — Ori Marko
– Ori Marko, Commented Feb 25, 2019 at 14:31

Shubham · Accepted Answer · 2019-02-26 06:59:19Z

2

There is one way here, i hope i understood the question correct ,

MockMvcRequestBuilders
.post("/servlet/api/update")
.content("{\"id\":1,\"toggle\":true}]")
.session(httpSession)
.contentType(MediaType.APPLICATION_JSON)
.andExpect(jsonPath("$[0].key",is("value")));

andExpect(jsonPath("$[0].key",is("value")))

you can use this for each key and value.

Or

try this ,

 MockMvcRequestBuilders
.post("/servlet/api/update")
.content("{\"id\":1,\"toggle\":true}]")
.session(httpSession)
.contentType(MediaType.APPLICATION_JSON)
.andExpect(content().string(containsString("value")));

edited Feb 26, 2019 at 6:59

answered Feb 26, 2019 at 6:50

Shubham

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5 Comments

Ori Marko Over a year ago

method is(String) is undefined, what is the static import?

Shubham Over a year ago

import static org.hamcrest.Matchers.is;

Ori Marko Over a year ago

we don't use hamcrest yet

Ori Marko Over a year ago

Sorry but also method containsString(String) is undefined

Shubham Over a year ago

i am so sorry i didn't realize its again from hamcrest, but would it not solve your problem if you use it?

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