final String nm = "row200.xls";
Book book = new ExcelImporter().imports(getClass().getResource("/"+nm));
Sheet sheet1 = (Sheet) book.getSheets().get(0);
try {
sheet1.deleteRows(-1, -1);
assertFalse("Should come here after sheet1.deleteRows(-1, -1);",true);
} catch(Exception ex) {
System.out.println(ex.getMessage());//correct and ignore
//correct and ignore
}