@Test
 public void testZSS502_NonExistingSheet2007() {
   Book book = Util.loadBook(this, "book/blank.xlsx");
   Sheet sheet = book.getSheetAt(0);
   Range cell = Ranges.range(sheet, "A1");
   cell.setCellEditText("=nonExisted!B1");
   assertEquals("=nonExisted!B1", cell.getCellEditText());
   assertEquals(ErrorConstants.getText(ErrorConstants.ERROR_REF), cell.getCellFormatText());
 }
 @Test
 public void testZSS510() {
   Book book = Util.loadBook(this, "book/blank.xlsx");
   Sheet sheet = book.getSheetAt(0);
   Range r = Ranges.range(sheet, "A1");
   r.setCellEditText("Hello");
   CellOperationUtil.applyDataFormat(r, "");
   r.getCellFormatText(); // get text shouldn't cause IndexOutBoundaryException
   assertEquals(
       "General", r.getCellStyle().getDataFormat()); // should get General instead of empty string
 }