public void testOnMouseOver() {
loadApi(new Runnable() {
public void run() {
Options options = Options.create();
AreaChart chart = new AreaChart(createCompanyPerformance(), options);
chart.addOnMouseOverHandler(new OnMouseOverHandler() {
@Override
public void onMouseOverEvent(OnMouseOverEvent event) {
assertNotNull(event);
assertEquals(1, event.getRow());
assertEquals(1, event.getColumn());