src/testcases/org/apache/poi/ss/formula/functions/TestLogicalFunction.java

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   this work for additional information regarding copyright ownership.
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package org.apache.poi.ss.formula.functions;

import java.io.IOException;

import junit.framework.TestCase;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellValue;
import org.apache.poi.ss.usermodel.FormulaEvaluator;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.ss.util.CellReference;

/**
 * LogicalFunction unit tests.
 */
public class TestLogicalFunction extends TestCase {

    private FormulaEvaluator evaluator;
    private Row row3;
    private Cell cell1;
    private Cell cell2;

    @Override
    public void setUp() throws IOException {
        Workbook wb = new HSSFWorkbook();
        try {
            buildWorkbook(wb);
        } finally {
            wb.close();
        }
    }

    private void buildWorkbook(Workbook wb) {
        Sheet sh = wb.createSheet();
        Row row1 = sh.createRow(0);
        Row row2 = sh.createRow(1);
        row3 = sh.createRow(2);

        row1.createCell(0, Cell.CELL_TYPE_NUMERIC);
        row1.createCell(1, Cell.CELL_TYPE_NUMERIC);

        row2.createCell(0, Cell.CELL_TYPE_NUMERIC);
        row2.createCell(1, Cell.CELL_TYPE_NUMERIC);

        row3.createCell(0);
        row3.createCell(1);

        CellReference a1 = new CellReference("A1");
        CellReference a2 = new CellReference("A2");
        CellReference b1 = new CellReference("B1");
        CellReference b2 = new CellReference("B2");

        sh.getRow(a1.getRow()).getCell(a1.getCol()).setCellValue(35);
        sh.getRow(a2.getRow()).getCell(a2.getCol()).setCellValue(0);
        sh.getRow(b1.getRow()).getCell(b1.getCol()).setCellFormula("A1/A2");
        sh.getRow(b2.getRow()).getCell(b2.getCol()).setCellFormula("NA()");

        evaluator = wb.getCreationHelper().createFormulaEvaluator();
    }

    public void testIsErr() {
        cell1 = row3.createCell(0);
        cell1.setCellFormula("ISERR(B1)"); // produces #DIV/0!
        cell2 = row3.createCell(1);
        cell2.setCellFormula("ISERR(B2)"); // produces #N/A

        CellValue cell1Value = evaluator.evaluate(cell1);
        CellValue cell2Value = evaluator.evaluate(cell2);

        assertEquals(true, cell1Value.getBooleanValue());
        assertEquals(false, cell2Value.getBooleanValue());
    }

    public void testIsError() {
        cell1 = row3.createCell(0);
        cell1.setCellFormula("ISERROR(B1)"); // produces #DIV/0!
        cell2 = row3.createCell(1);
        cell2.setCellFormula("ISERROR(B2)"); // produces #N/A

        CellValue cell1Value = evaluator.evaluate(cell1);
        CellValue cell2Value = evaluator.evaluate(cell2);

        assertEquals(true, cell1Value.getBooleanValue());
        assertEquals(true, cell2Value.getBooleanValue());
    }
}