@RestController
public class ReservationController
{
@Autowired private Reservation reservation;

@RequestMapping(value="/reservation", produces=MediaType.APPLICATION_JSON_UTF8_VALUE, method=RequestMethod.POST)
@ResponseBody
public Reservation getReservation()
{

 return reservation;
}
}

public class Reservation
{
private long id;
private String reservationName;

public Reservation() {
super();
this.id = 333;
this.reservationName = "prova123";
}

public Reservation(long id, String reservationName) {
super();
this.id = id;
this.reservationName = reservationName;
}

public long getId() {
return id;
}

public void setId(long id) {
this.id = id;
}

public String getReservationName() {
return reservationName;
}

public void setReservationName(String reservationName) {
this.reservationName = reservationName;
}

@Override
public String toString() {
return "Reservation [id=" + id + ", reservationName=" + reservationName + "]";
}
}

@WebMvcTest
@RunWith(SpringRunner.class)
public class MvcTest
{
@Autowired private MockMvc mockMvc;

@MockBean(name="reservation")
private Reservation reservation;

@Test public void postReservation() throws Exception
{
mockMvc.perform(MockMvcRequestBuilders.post("/reservation"))
.andExpect(MockMvcResultMatchers.content().contentType(MediaType.APPLICATION_JSON_UTF8_VALUE))
.andExpect(MockMvcResultMatchers.status().isOk());
}