cell.setCellFormula("isblank(Sheet2!A1:A1)");
HSSFFormulaEvaluator fe = new HSSFFormulaEvaluator(sheet1, wb);
fe.setCurrentRow(row);
CellValue result = fe.evaluate(cell);
assertEquals(HSSFCell.CELL_TYPE_BOOLEAN, result.getCellType());
assertEquals(true, result.getBooleanValue());
cell.setCellFormula("isblank(D7:D7)");
result = fe.evaluate(cell);
assertEquals(HSSFCell.CELL_TYPE_BOOLEAN, result.getCellType());
assertEquals(true, result.getBooleanValue());
}