"Application context not configured for this file"

Let me straight, I’m sick and tired of this Application context not configured for this file warning. I don’t know what it wants from me. I create a context bound to that config file in my test class. If it wants me to write any configuration xmls, I won’t do that

@Configuration
@ComponentScan
// the warning happens here
public class Config {
}
// here's where I use that config
@ExtendWith(SpringExtension.class)
@ContextConfiguration(classes = Config.class)
public class AppTest {
    @Autowired
    private Sage sage;
    @Test
    public void testApp() {
        sage.sayWisdom();
    }
}

Could you please tell me how I can avoid that warning?