@Before
public void setUp() {
gridLayer = new GridLayerFixture();
selectionLayer = (SelectionLayer) gridLayer.getBodyLayer()
.getViewportLayer().getScrollableLayer();
model = new ColumnGroupModel();
handler = new ColumnGroupsCommandHandler(model, selectionLayer,
new ColumnGroupHeaderLayer(gridLayer.getColumnHeaderLayer(),
gridLayer.getBodyLayer().getSelectionLayer(),
new ColumnGroupModel()));
gridLayer.setClientAreaProvider(new IClientAreaProvider() {
public Rectangle getClientArea() {
return new Rectangle(0, 0, 1050, 250);
}