private SortStatePersistor<RowDataFixture> sortStatePersistor;
@Before
public void setup() {
properties = new Properties();
sortModel = new SortModelFixture();
sortHeaderLayer = new SortHeaderLayer<RowDataFixture>(
new DataLayerFixture(10, 20, 100, 20), sortModel);
sortStatePersistor = new SortStatePersistor<RowDataFixture>(sortModel);
}