public void test55640working() throws IOException {
        Workbook wb = new XSSFWorkbook();
        Sheet sheet = wb.createSheet("sheet123");
        sheet.groupRow(1, 4);
        sheet.groupRow(2, 5);
        sheet.groupRow(3, 6);
        
        sheet.setRowGroupCollapsed(1, true);
        sheet.setRowGroupCollapsed(2, false);
        sheet.setRowGroupCollapsed(3, false);