Android：如何在ListView中以编程方式调用onScroll事件

@RunWith(RobolectricTestRunner.class)
public class ActivityListViewTest {

    private ActivityListView activity;

    @Before
    public void setUp() throws Exception {
        activity = new ActivityListView();
    }

    @Test
    public void shouldUpdateListViewChildCountOnCreate() throws Exception{
        activity.onCreate(null);
        ListView calendarListView = (ListView)activity.findViewById(R.id.listview);

        assertTrue(\"CHILD COUNT IS: \" + calendarListView.getChildCount(), calendarListView.getChildCount() > 0);

        // Here i want to invoke onScroll event. Then ListView must update and listView items count become to be more that 20

        assertTrue(\"CHILD COUNT IS: \" + calendarListView.getChildCount(), calendarListView.getChildCount() > 20);
    }
}