//one level
sheet.groupRow(9,10);
assertEquals(2,sheet.rows.size());
CTRow[]rowArray=sheet.getWorksheet().getSheetData().getRowArray();
assertEquals(2,rowArray.length);
CTRow ctrow=rowArray[0];
assertNotNull(ctrow);
assertEquals(9,ctrow.getR());
assertEquals(1, ctrow.getOutlineLevel());
assertEquals(1,sheet.getSheetTypeSheetFormatPr().getOutlineLevelRow());
//two level
sheet.groupRow(10,13);
rowArray=sheet.getWorksheet().getSheetData().getRowArray();
assertEquals(5,rowArray.length);
assertEquals(5,sheet.rows.size());
ctrow=rowArray[1];
assertNotNull(ctrow);
assertEquals(10,ctrow.getR());
assertEquals(2, ctrow.getOutlineLevel());
assertEquals(2,sheet.getSheetTypeSheetFormatPr().getOutlineLevelRow());
sheet.ungroupRow(8, 10);
rowArray=sheet.getWorksheet().getSheetData().getRowArray();