src/testcases/org/apache/poi/ss/formula/TestFunctionRegistry.java

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 *    this work for additional information regarding copyright ownership.
 *    The ASF licenses this file to You under the Apache License, Version 2.0
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package org.apache.poi.ss.formula;

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

import java.io.IOException;

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.formula.atp.AnalysisToolPak;
import org.apache.poi.ss.formula.eval.ErrorEval;
import org.apache.poi.ss.formula.eval.FunctionEval;
import org.apache.poi.ss.formula.eval.NotImplementedException;
import org.apache.poi.ss.formula.eval.ValueEval;
import org.apache.poi.ss.usermodel.CellValue;
import org.junit.jupiter.api.AfterEach;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.MethodOrderer;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.TestMethodOrder;

@TestMethodOrder(MethodOrderer.MethodName.class)
class TestFunctionRegistry {

    HSSFWorkbook wb;
    HSSFSheet sheet;
    HSSFRow row;
    HSSFFormulaEvaluator fe;

    @BeforeEach
    void setup() {
        wb = new HSSFWorkbook();
        sheet = wb.createSheet("Sheet1");
        row = sheet.createRow(0);
        fe = new HSSFFormulaEvaluator(wb);
    }

    @AfterEach
    void teardown() throws IOException {
        wb.close();
        wb = null;
        sheet = null;
        row = null;
        fe = null;
    }

    @Test
	void testRegisterInRuntimeA() {
        HSSFCell cellA = row.createCell(0);
        cellA.setCellFormula("FISHER(A5)");
        assertThrows(NotImplementedException.class, () -> fe.evaluate(cellA));
    }

    @Test
    void testRegisterInRuntimeB() {
        HSSFCell cellA = row.createCell(0);
        cellA.setCellFormula("FISHER(A5)");
        FunctionEval.registerFunction("FISHER", (args, srcRowIndex, srcColumnIndex) -> ErrorEval.NA);
        CellValue cv = fe.evaluate(cellA);
        assertEquals(ErrorEval.NA.getErrorCode(), cv.getErrorValue());
    }

    @Test
    void testRegisterInRuntimeC() {
        HSSFCell cellB = row.createCell(1);
        cellB.setCellFormula("CUBEMEMBERPROPERTY(A5)");
        assertThrows(NotImplementedException.class, () -> fe.evaluate(cellB));
    }

    @Test
    void testRegisterInRuntimeD() {
        HSSFCell cellB = row.createCell(1);
        cellB.setCellFormula("CUBEMEMBERPROPERTY(A5)");

        AnalysisToolPak.registerFunction("CUBEMEMBERPROPERTY", (args, ec) -> ErrorEval.NUM_ERROR);

        CellValue cv = fe.evaluate(cellB);
        assertEquals(ErrorEval.NUM_ERROR.getErrorCode(), cv.getErrorValue());
	}

	private static ValueEval na(ValueEval[] args, int srcRowIndex, int srcColumnIndex) {
        return ErrorEval.NA;
    }

    @Test
    void testExceptionsA() {
        IllegalArgumentException ex = assertThrows(
            IllegalArgumentException.class,
            () -> FunctionEval.registerFunction("SUM", TestFunctionRegistry::na)
        );
        assertEquals("POI already implements SUM. You cannot override POI's implementations of Excel functions", ex.getMessage());
    }

    @Test
    void testExceptionsB() {
        IllegalArgumentException ex = assertThrows(
            IllegalArgumentException.class,
            () -> FunctionEval.registerFunction("SUMXXX", TestFunctionRegistry::na)
        );
        assertTrue(ex.getMessage().contains("Unknown function: SUMXXX"));
    }

    @Test
    void testExceptionsC() {
        IllegalArgumentException ex = assertThrows(
            IllegalArgumentException.class,
            () -> FunctionEval.registerFunction("ISODD", TestFunctionRegistry::na)
        );
        assertEquals("ISODD is a function from the Excel Analysis Toolpack. " +
             "Use AnalysisToolpack.registerFunction(String name, FreeRefFunction func) instead.",
             ex.getMessage());
    }

    private static ValueEval atpFunc(ValueEval[] args, OperationEvaluationContext ec) {
        return ErrorEval.NUM_ERROR;
    }

    @Test
    void testExceptionsD() {
        IllegalArgumentException ex = assertThrows(
            IllegalArgumentException.class,
            () -> AnalysisToolPak.registerFunction("ISODD", TestFunctionRegistry::atpFunc)
        );
        assertEquals("POI already implements ISODD. You cannot override POI's implementations of Excel functions", ex.getMessage());
    }

    @Test
    void testExceptionsE() {
        IllegalArgumentException ex = assertThrows(
            IllegalArgumentException.class,
            () -> AnalysisToolPak.registerFunction("ISODDXXX", TestFunctionRegistry::atpFunc)
        );
        assertEquals("ISODDXXX is not a function from the Excel Analysis Toolpack.", ex.getMessage());
    }

    @Test
    void testExceptionsF() {
        IllegalArgumentException ex = assertThrows(
            IllegalArgumentException.class,
            () -> AnalysisToolPak.registerFunction("SUM", TestFunctionRegistry::atpFunc)
        );
        assertEquals("SUM is a built-in Excel function. " +
             "Use FunctoinEval.registerFunction(String name, Function func) instead.",
             ex.getMessage());
    }
}