Spring boot integration test Authentication

Question

Hello everyone in my application im using oauth2.0 for authentication in my controller methods im always checking if Authentication argument is always set.

public ResponseEntity<?> getFarm(Authentication authentication) {
        if (authentication == null) {
            return new ResponseEntity<>(HttpStatus.UNAUTHORIZED);
        }
}

everything works fine but im trying to write integration test for this and I have problem with mocking the authentication i was trying many solutions there like : Spring Test & Security: How to mock authentication? but still im getting null.

this is my integration test

@RunWith(SpringRunner.class)
@SpringBootTest(webEnvironment= SpringBootTest.WebEnvironment.RANDOM_PORT)
public class TestRest {

    @Autowired
    private TestRestTemplate restTemplate;

    @Test
    public void findAllCustomers() {
        var farmInfoDto = new FarmInfoDto("big farm", "warsaw", "strett", "123", "15a");

        var test = restTemplate.withBasicAuth("test","test").postForEntity("/farm", farmInfoDto, Farm.class);
        var farm = test.getBody();

        assert farm.getFarmName().equals(farmInfoDto.farmName());
    }
}