assertEquals(Cell.CELL_TYPE_ERROR, valueIV3.getCellType());
testToFormulaString(cellIV3, "SUM(#REF!)");
}
private void testToFormulaString(Cell cell, String expect) {
HSSFEvaluationWorkbook evalbook = HSSFEvaluationWorkbook.create((HSSFWorkbook)_workbook);
Ptg[] ptgs = BookHelper.getCellPtgs(cell);
final String formula = FormulaRenderer.toFormulaString(evalbook, ptgs);
assertEquals(expect, formula);
}