@RunWith(SpringRunner.class)
@WebMvcTest(BookCRUDOperationsController.class)
public class BookCRUDOperationsControllerTest {

    @Autowired
    MockMvc mockMvc;

    @MockBean
    BookCRUDOperationsService bookCRUDOperationsService;

    @Test
    public void createBook() throws Exception {

        Book newBook = new Book("W pustyni i w puszczy", "Henryk Sienkiewicz", "dramat", true);

        //Mockito.when(bookCRUDOperationsService.createBook(newBook)).thenReturn(newBook); ??

        mockMvc.perform(post("/books"))
                .andExpect(status().isOk()).andDo(print())
                .andExpect((ResultMatcher) content().contentType(MediaType.APPLICATION_JSON_UTF8)).andReturn();
    }