How to set an Autowired field in an Aspect from junit test?

I have a Aspect that has an Autowired field config and in my unit test I would like to set a mock to config after defining mock behavior.

Aspect:

@Aspect
public class Aspect {

    @Autowired
    private Configuration config;

...

Unit Test:

@Autowired
private Configuration config;

@Before
public void setup() {
    when(config.getInt(TTL)).thenReturn(10000);
    // set confing to Aspect
}

I know spring has ReflectionTestUtils.setField for setting an autowired field, but I don't have a reference to the aspect object.