@Test
public void testCreateNullColumn() {

    // factory returns null on create
    ColumnFactory factory = new ColumnFactory() {
        @Override
        public TableColumnExt createTableColumn(int modelIndex) {
            return null;
        }
        
        
    };
    TableModel model = new DefaultTableModel(0, 10);
    factory.createAndConfigureTableColumn(model, 0);
    
}