public void testSortColumns() {
CTWorksheet worksheet = CTWorksheet.Factory.newInstance();
ColumnHelper helper = new ColumnHelper(worksheet);
CTCols cols1 = CTCols.Factory.newInstance();
CTCol col1 = cols1.addNewCol();
col1.setMin(1);
col1.setMax(1);
col1.setWidth(88);
col1.setHidden(true);
CTCol col2 = cols1.addNewCol();