TestReadMissingBuiltInFuncs.java

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

import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertFalse;
import static org.junit.jupiter.api.Assertions.assertNotEquals;
import static org.junit.jupiter.api.Assertions.fail;

import java.lang.reflect.InvocationTargetException;

import org.apache.poi.hssf.HSSFTestDataSamples;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.util.RecordFormatException;
import org.junit.jupiter.api.AfterAll;
import org.junit.jupiter.api.BeforeAll;
import org.junit.jupiter.api.Test;

/**
 * Tests reading from a sample spreadsheet some built-in functions that were not properly
 * registered in POI as of bug #44675, #44733 (March/April 2008).
 */
final class TestReadMissingBuiltInFuncs {

    /**
     * This spreadsheet has examples of calls to the interesting built-in functions in cells A1:A7
     */
    private static final String SAMPLE_SPREADSHEET_FILE_NAME = "missingFuncs44675.xls";

    private static HSSFWorkbook wb;
    private static HSSFSheet _sheet;

    @BeforeAll
    public static void initSheet() {
        wb = HSSFTestDataSamples.openSampleWorkbook(SAMPLE_SPREADSHEET_FILE_NAME);
        try {
            _sheet = wb.getSheetAt(0);
        } catch (RecordFormatException e) {
            if(e.getCause() instanceof InvocationTargetException) {
                InvocationTargetException ite = (InvocationTargetException) e.getCause();
                if(ite.getTargetException() instanceof RuntimeException) {
                    RuntimeException re = (RuntimeException) ite.getTargetException();
                    assertNotEquals("Invalid built-in function index (189)", re.getMessage(),
                        "DPRODUCT() registered with wrong index");
                }
            }
            // some other unexpected error
            throw e;
        }
    }

    @AfterAll
    public static void closeResources() throws Exception {
        wb.close();
    }

    @Test
    void testDatedif() {
        String formula;
        try {
            formula = getCellFormula(0);
        } catch (IllegalStateException e) {
            if(e.getMessage().startsWith("Too few arguments")) {
                assertFalse(e.getMessage().contains("AttrPtg"),
                    "tAttrVolatile not supported in FormulaParser.toFormulaString");
                fail("NOW() registered with 1 arg instead of 0");
            }
            if(e.getMessage().startsWith("too much stuff")) {
                fail("DATEDIF() not registered");
            }
            // some other unexpected error
            throw e;
        }
        assertEquals("DATEDIF(NOW(),NOW(),\"d\")", formula);
    }

    @Test
    void testDdb() {
        String formula = getCellFormula(1);
        assertNotEquals("externalflag(1,1,1,1,1)", formula, "DDB() not registered");
        assertEquals("DDB(1,1,1,1,1)", formula);
    }

    @Test
    void testAtan() {
        String formula = getCellFormula(2);
        assertNotEquals("ARCTAN(1)", formula, "func ix 18 registered as ARCTAN() instead of ATAN()");
        assertEquals("ATAN(1)", formula);
    }

    @Test
    void testUsdollar() {
        String formula = getCellFormula(3);
        assertNotEquals("YEN(1)", formula, "func ix 204 registered as YEN() instead of USDOLLAR()");
        assertEquals("USDOLLAR(1)", formula);
    }

    @Test
    void testDBCS() {
        String formula = "";
        try {
            formula = getCellFormula(4);
        } catch (IllegalStateException e) {
            assertFalse(e.getMessage().startsWith("too much stuff"), "DBCS() not registered");
            // some other unexpected error
            throw e;
        } catch (NegativeArraySizeException e) {
            fail("found err- DBCS() registered with -1 args");
        }
        assertNotEquals("JIS(\"abc\")", formula, "func ix 215 registered as JIS() instead of DBCS()");
        assertEquals("DBCS(\"abc\")", formula);
    }

    @Test
    void testIsnontext() {
        String formula;
        try {
            formula = getCellFormula(5);
        } catch (IllegalStateException e) {
            assertFalse(e.getMessage().startsWith("too much stuff"), "ISNONTEXT() registered with wrong index");
            // some other unexpected error
            throw e;
        }
        assertEquals("ISNONTEXT(\"abc\")", formula);
    }

    @Test
    void testDproduct() {
        String formula = getCellFormula(6);
        assertEquals("DPRODUCT(C1:E5,\"HarvestYield\",G1:H2)", formula);
    }

    private String getCellFormula(int rowIx) {
        //      if (false) {
//          System.err.println(result);
//      }
        return _sheet.getRow(rowIx).getCell(0).getCellFormula();
    }
}