How to get ResponseBody of @RestController as object in a MockMvc junit test?

Question

I have a simple junit test that verifies the response of a servlet endpoint.

Problem: I want to obtain the response as java object Person, and not as string/json/xml representation.

Is that possible?

@RestController
public class PersonController {
    @GetMapping("/person")
    public PersonRsp getPerson(int id) {
        //...
        return rsp;
    }   
}

@RunWith(SpringRunner.class)
@WebMvcTest(value = PersonController.class)
public class PersonControllerTest {
    @Autowired
    private MockMvc mvc;

    @Test
    public void test() {
        MvcResult rt = mvc.perform(get("/person")
                .param("id", "123")
                .andExpect(status().isOk())
                .andReturn();

        //TODO how to cast the result to (Person) p?
    }
}

score 11 · Answer 1 · edited Feb 24 '18 at 18:37

11

you could deserialize it like this:

String json = rt.getResponse().getContentAsString();
Person person = new ObjectMapper().readValue(json, Person.class);

You can also @Autowire the ObjectMapper

edited Feb 24 '18 at 18:37

lilalinux

2,903
3
43
53

answered Nov 09 '17 at 14:55

andgalf

170
10

Additionally can verify the response object JSON directly with `.andExpect(content().json("{'message':'ok'}"));` etc. – Darren Forsythe Nov 09 '17 at 14:56
How can I `@Autowire the ObjectMapper`? Can you give an example? – Evandro Coan Jul 22 '20 at 19:49
You can read about Autowiring [here](https://www.baeldung.com/spring-autowire) or [here](https://stackoverflow.com/a/19419296/8371162) hope that helps – andgalf Jul 23 '20 at 09:04

score 2 · Answer 2 · answered Nov 10 '17 at 15:14

As my goal was mainly to test the whole setup, means by spring autoconfigured set of objectmapper and restcontroller, I just created a mock for the endpoint. And there returned the input parameter as response, so I can validate it:

@RestController
public class PersonControllerMock {
    @GetMapping("/person")
    public PersonDTO getPerson(PersonDTO dto) {
        return dto;
    }   
}


@RunWith(SpringRunner.class)
@WebMvcTest(value = PersonControllerMock.class)
public class PersonControllerTest {
    @Autowired
    private MockMvc mvc;

    @Test
    public void test() {
        mvc.perform(get("/person")
                .param("id", "123")
                .param("firstname", "john")
                .param("lastname", "doe")
                .andExpect(status().isOk())
                .andExpect(jsonPath("$.firstname").value("john"))
                .andExpect(jsonPath("$.lastname").value("doe"))
                .andReturn();
    }
}

score 0 · Answer 3 · answered Nov 09 '17 at 15:01

0

You can use TestRestTemplate::getForEntity if you are not limited with mockMvc

answered Nov 09 '17 at 15:01

Alexander.Furer

1,817
1
16
24

How to get ResponseBody of @RestController as object in a MockMvc junit test?

3 Answers3