TestNpv.java

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package org.apache.poi.ss.formula.functions;

import static org.junit.jupiter.api.Assertions.assertEquals;

import org.apache.poi.hssf.HSSFTestDataSamples;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFFormulaEvaluator;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.CellValue;
import org.junit.jupiter.api.Test;

/**
 * Tests for {@link Npv}
 *
 * @see <a href="http://office.microsoft.com/en-us/excel-help/npv-HP005209199.aspx">Excel Help</a>
 */
final class TestNpv {

    @Test
    void testEvaluateInSheetExample2() {
        HSSFWorkbook wb = new HSSFWorkbook();
        HSSFSheet sheet = wb.createSheet("Sheet1");
        HSSFRow row = sheet.createRow(0);

        sheet.createRow(1).createCell(0).setCellValue(0.08d);
        sheet.createRow(2).createCell(0).setCellValue(-40000d);
        sheet.createRow(3).createCell(0).setCellValue(8000d);
        sheet.createRow(4).createCell(0).setCellValue(9200d);
        sheet.createRow(5).createCell(0).setCellValue(10000d);
        sheet.createRow(6).createCell(0).setCellValue(12000d);
        sheet.createRow(7).createCell(0).setCellValue(14500d);

        HSSFCell cell = row.createCell(8);
        HSSFFormulaEvaluator fe = new HSSFFormulaEvaluator(wb);

        // Enumeration
        cell.setCellFormula("NPV(A2, A4,A5,A6,A7,A8)+A3");
        fe.clearAllCachedResultValues();
        fe.evaluateFormulaCell(cell);
        double res = cell.getNumericCellValue();
        assertEquals(1922.06d, Math.round(res * 100d) / 100d, 0);

        // Range
        cell.setCellFormula("NPV(A2, A4:A8)+A3");

        fe.clearAllCachedResultValues();
        fe.evaluateFormulaCell(cell);
        res = cell.getNumericCellValue();
        assertEquals(1922.06d, Math.round(res * 100d) / 100d, 0);
    }

    /**
     * evaluate formulas with NPV and compare the result with
     * the cached formula result pre-calculated by Excel
     */
    @Test
    void testNpvFromSpreadsheet(){
        HSSFWorkbook wb = HSSFTestDataSamples.openSampleWorkbook("IrrNpvTestCaseData.xls");
        HSSFSheet sheet = wb.getSheet("IRR-NPV");
        HSSFFormulaEvaluator fe = new HSSFFormulaEvaluator(wb);
        int failureCount = 0;
        // TODO YK: Formulas in rows 16 and 17 operate with ArrayPtg which isn't yet supported
        // FormulaEvaluator as of r1041407 throws "Unexpected ptg class (org.apache.poi.ss.formula.ptg.ArrayPtg)"
        for(int rownum = 9; rownum <= 15; rownum++){
            HSSFRow row = sheet.getRow(rownum);
            HSSFCell cellB = row.getCell(1);
            try {
                CellValue cv = fe.evaluate(cellB);
                assertFormulaResult(cv, cellB);
            } catch (Throwable e){
                failureCount++;
            }
        }

        assertEquals(0, failureCount, "IRR evaluations failed");
    }

    private static void assertFormulaResult(CellValue cv, HSSFCell cell){
        double actualValue = cv.getNumberValue();
        double expectedValue = cell.getNumericCellValue(); // cached formula result calculated by Excel
        assertEquals(expectedValue, actualValue, 1E-4); // should agree within 0.01%
    }
}