Kamil Krzyk, thanks for sharing!

I don’t believe the following is a good way of getting the current activity though

public Activity getCurrentActivity() {        return ((TestApplication) InstrumentationRegistry.            getTargetContext().getApplicationContext()).getCurrentActivity();    }

Inside the Espresso test, one can do the following which is better:

@Nullable
protected Activity getActivityInstance() {
    final Activity[] currentActivity = new Activity[1];
    getInstrumentation().runOnMainSync(() -> {
        Collection<Activity> resumedActivities = ActivityLifecycleMonitorRegistry.getInstance()
                .getActivitiesInStage(Stage.RESUMED);
        for (Activity act : resumedActivities) {
            currentActivity[0] = act;
        }
    });

    return currentActivity[0];
}

Do you have a Github repository for me to understand your tutorial better?