Can not attach body to my POST request using Spring MockMvc - spring

Question

I'm trying to test my rest controller. No issues with GETs, but when I try to test a POST method I'm unable to attach the body.
private static final MediaType contentType = new MediaType(MediaType.APPLICATION_JSON.getType(),
MediaType.APPLICATION_JSON.getSubtype(),
Charset.forName("utf8"));
private ObjectMapper jsonMapper = new ObjectMapper().setSerializationInclusion(JsonInclude.Include.NON_NULL);
#Test
public void test1() throws Exception {
//...Create DTO
//...Create same pojo but as entity
when(serviceMock.addEntity(e)).thenReturn(e);
mvc.perform(post("/uri")
.contentType(contentType)
.content(jsonMapper.writeValueAsString(dto))
)
.andDo(print())
.andExpect(status().isCreated())
.andExpect(content().contentType(contentType)); //fails because there is no content returned
}
This is the request output:
MockHttpServletRequest:
HTTP Method = POST
Request URI = /uri
Parameters = {}
Headers = {Content-Type=[application/json;charset=UTF-8]}
There is no body. Why? I have printed jsonMapper.writeValueAsString(dto) and is not null.
edit:
Adding controller code:
#RestController
#RequestMapping("/companies")
public class CompanyController {
#Autowired
private CompanyService service;
#Autowired
private CompanyMapper mapper;
#RequestMapping(method=RequestMethod.GET)
public List<CompanyDTO> getCompanies() {
List<Company> result = service.getCompanies();
return mapper.toDtoL(result);
}
#RequestMapping(method=RequestMethod.POST)
#ResponseStatus(HttpStatus.CREATED)
public CompanyDTO createCompany(#RequestBody #Valid CompanyDTO input) {
Company inputE = mapper.toEntity(input);
Company result = service.addCompany(inputE);
return mapper.toDto(result);
}

Answer 1

Solved.
The mock call should use any instead of a concrete object: when(serviceMock.addCompany(any(Company.class))).thenReturn(e);
I needed to override the equals method of the entity class to pass this statement: verify(serviceMock, times(1)).addCompany(e);