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);