The service is set to null in my Junit Test

I am creating tests for my Springboot application. The application through a Get call, passing my "CarRequest" in the RequestBody

public class CarsRequest implements Serializable {      private String name;      private String plate ;      private  String price;  }  

it gives me back the car specifications related to that data

{     "name":"",     "plate":"",     "price":"",     "brand":"",     "kilometers":"",     "revisiondate":"",     "owner":""  }    

I did this simple test using Mockito but I don't understand why my service is set by default to null, this throws everything in NullPointErexception

public class CarTest {      @Autowired      private MockMvc mockMvc;      @MockBean      private CarService service;      @Autowired      ObjectMapper objectMapper;      @Test      public void TestOk() throws Exception{          CarsRequest carsRequest = new CarsRequest();          Car  car = new Car();          List<Car> cars = new ArrayList<>();          //septum the fields of cars and add them to the list          cars.add(car);          Mockito.when(                  service.getByPlate("bmw",                          "TG23IO", "1500")).thenReturn(cars);          RequestBuilder requestBuilder = MockMvcRequestBuilders.get(                  "/garage/cars").accept(                  MediaType.APPLICATION_JSON);          MvcResult result = mockMvc.perform(requestBuilder).andReturn();          System.out.println(result.getResponse());          String expected = "{name:"bmw","plate":"TG23IO","price":"1500","brand":"POL","kilometers":"80000","revisiondate":"2016-03-15","owner":"JohnLocke"}";          JSONAssert.assertEquals(expected, result.getResponse()                  .getContentAsString(), false);      }  }  

Below I also add my CarService

@Service  public class DocumentService {      @Autowired      CarRepository carRepository;      @Autowired      ObjectMapper objectMapper;      public List<Cars> getByContratto(String name, String plate, String price) throws JsonProcessingException {          //some code, extraction logic          return cars;      }  }    

The application works perfectly, only the test does not work. Being a novice in test writing I can't figure out what the null on my Carservice is due to. If needed, I can include the Controller Get and the repository as well, but I don't think they can help

https://stackoverflow.com/questions/66725885/the-service-is-set-to-null-in-my-junit-test March 21, 2021 at 03:55AM