In a Spring boot test, how can I create a bean and inyects by @Autowired?

When I test my Spring boot service I don't know how I can inyect an @Autowired bean.

My bean (Spring fills @Value from application.yml):

@Component
public class NavigatorProperties {
    @Value("${timerDelay}")
    private String timerDelay;

    public String getTimerDelay() {
        return timerDelay;
    }
    public void setTimerDelay(String timerDelay) {
        this.timerDelay = timerDelay;
    }
}

My api:

public class ListenerApi implements IRestListenerApi {
    @Autowired
    private NavigatorProperties np;

    public String doSomething (...) { // This is my service method.
        // Here np.getTimerDelay() will return application.yml value.
        int timerDelay = Integer.decode(np.getTimerDelay());
        ...
    }
}

This works fine and int value is correct. Here is my test:

@RunWith(SpringRunner.class)
@SpringBootTest(classes = {ListenerApiTest.class, NavigatorProperties.class})
@FixMethodOrder(MethodSorters.NAME_ASCENDING)
public class ListenerApiTest {
    @Autowired
    private NavigatorProperties np; // Can be autowired or a new Object.

    // Object to test.
    private ListenerApi listenerApi;

    @Test
    public void test01ForceNumberFormatException() {
        np.setTimerDelay("NumberFormatException");
        // Inyect into ListenerApi
    }

    @Test
    public void test02ForceNullPointerException() {
        np.setTimerDelay(null);
        // Inyect into ListenerApi
    }

In this test comments, how I can inyect into ListenerApi by @Autowired?

Thanks.