Espresso - how to get current activity to test Fragments?

Question

I have been playing around with Espresso tests for couple weeks now and I finally decided to start testing Fragments.

Immediately I ran into a problem,

Answer 1

I usually get it like this, it looks (and probably is) hacky but, hey, it works

import static android.support.test.InstrumentationRegistry.getInstrumentation;

public class MyTest {

    private Activity getActivityInstance(){
        final Activity[] currentActivity = {null};

        getInstrumentation().runOnMainSync(new Runnable(){
            public void run(){
                Collection resumedActivity = ActivityLifecycleMonitorRegistry.getInstance().getActivitiesInStage(Stage.RESUMED);
                Iterator it = resumedActivity.iterator();
                currentActivity[0] = it.next();
            }
        });

        return currentActivity[0];
    }
}