RestControllerTest

@SpringBootTest
@AutoConfigureMockMvc
public class MessageControllerTest {

    @Autowired
    private MockMvc mockMvc;
    private String postUrl = "http://localhost:8081/api/messages?text=text1";

    @Test
    public void testPostMessage() throws Exception{
        mockMvc.perform(post(postUrl))
                .andDo(print())
                .andExpect(status().isOk())
                .andExpect(content().string(containsString("{\"id\": 0}")));//  fixme how to test this case?

    }

}