Spring boot mapping exception cannot test - spring-boot

Question

I'm trying to test this basic controller class and can’t seem to test the exceptions being mocked in the test. It just doesn’t seem to catch the exception, just returns 200 ok
Update:
I have the exception now being thrown, but the controller advice is not catching them.
Controller
private final Service service;
#GetMapping(value = “/cars/{id}”, produces = APPLICATION_JSON_VALUE)
public ResponseEntity<List<Cars>> getCar(#PathVariable final String carId) {
var car = this.service.getCar(carId);
return ResponseEntity.ok(car);
}
Here is my mapping class
#RestControllerAdvice
public class Mapper {
#ExceptionHandler({CarNotFoundException.class})
public ResponseEntity<Object> notFoundError(final CarNotFoundException ex, final ServletWebRequest request) {
return ResponseEntity.status(NOT_FOUND).contentType(MediaType.APPLICATION_JSON).body(“test”);
}
}
Exception class:
public class CarNotFoundException extends RuntimeException {
public CarNotFoundException(final String msg, final Exception ex) {
super(msg, ex);
}
public CarNotFoundException(final String msg) {
super(msg);
}
}
My Test:
It just keeps returning 200
#WebMvcTest(MyController.class)
#ContextConfiguration(classes={MyApplication.class})
public class ControllerTest {
#Autowired
private MockMvc mockMvc;
#MockBean
private Service service;
#Test
void should_return_404_not_found() throws Exception {
when(this.service.getCar(CONSTANT.CAR_ID))
.thenThrow(new CustomNotFoundException("not Found"));
mockMvc.perform(get("/api/cars/98776")
.contentType(MediaType.APPLICATION_JSON))
.andExpect(status().isNotFound());
}
}