Robolectric.setupActivity() is deprecated in Android unit test

I'm trying to use Robolectric framework to run a simple Unit test, although I got that Robolectric.setupActivity() is deprecated.

@RunWith(RobolectricTestRunner.class)
public class MainActivityFragmentTest {

    MainActivity mainActivity;

    @Before
    public void setUp() {
        mainActivity = Robolectric.setupActivity(MainActivity.class);
    }

    // Rest of Test

How can I solve that? Thanks for help in advance..