@Test
public void popOverWhenEventOverDecisionTableHeaderAndColumn() {

    when(modellerPresenter.getAvailableDecisionTables()).thenReturn(new HashSet<GuidedDecisionTableView.Presenter>() {{
        add(dtPresenter1);
    }});
    when(event.getX()).thenReturn(50);
    when(event.getY()).thenReturn(50);
    when(dtView1.getComputedLocation()).thenReturn(new Point2D(0,
                                                               0));
    handler.onNodeMouseMove(event);
    verify(columnPopOverPresenter,
           times(1)).show(any(GuidedDecisionTableModellerView.class),
                          eq(dtPresenter1),
                          eq(0));
}