Sheet sheet1 = (Sheet) book.getSheets().get(0);
int widthA = sheet1.getColumnWidth(0);
int widthB = sheet1.getColumnWidth(1);
int widthC = sheet1.getColumnWidth(2);
sheet1.deleteColumns(1,1);
assertEquals(widthA, sheet1.getColumnWidth(0));
assertTrue(widthB != sheet1.getColumnWidth(1));
assertEquals(widthC, sheet1.getColumnWidth(1));
}