assertTrue("one of the breaks didnt make it", is0 && is10 && is11);
sheet.removeRowBreak(11);
assertFalse("row should be removed", sheet.isRowBroken(11));
sheet.removeRowBreak(0);
assertFalse("row should be removed", sheet.isRowBroken(0));
sheet.removeRowBreak(10);
assertFalse("row should be removed", sheet.isRowBroken(10));