@Test
public void testAppend() throws VetoException {

    final ActionWorkItemCol52 column = new ActionWorkItemCol52();
    column.setHeader("col1");
    modelSynchronizer.appendColumn(column);
    assertEquals(1,
                 model.getActionCols().size());
    assertEquals(4,
                 uiModel.getColumns().size());
    assertTrue(uiModel.getColumns().get(3) instanceof BooleanUiColumn);
    assertEquals(true,
                 ((BaseMultipleDOMElementUiColumn) uiModel.getColumns().get(3)).isEditable());
}