assertEquals(-1, sheet.getRow(1).getLastCellNum());
assertEquals("Cell A,3", sheet.getRow(2).getCell(0).getStringCellValue());
assertEquals("Cell A,1", sheet.getRow(3).getCell(0).getStringCellValue());
// Shift the 4th row up into the gap in the 3rd row
sheet.shiftRows(3, 3, -2);
assertEquals(2, sheet.getLastRowNum());
assertEquals("Cell A,2", sheet.getRow(0).getCell(0).getStringCellValue());
assertEquals("Cell A,1", sheet.getRow(1).getCell(0).getStringCellValue());
assertEquals("Cell A,3", sheet.getRow(2).getCell(0).getStringCellValue());
assertEquals(-1, sheet.getRow(3).getLastCellNum());