TestRandBetween.java

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

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

import org.apache.poi.hssf.HSSFTestDataSamples;
import org.apache.poi.ss.formula.eval.ErrorEval;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellType;
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.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;

/**
 * Testcase for 'Analysis Toolpak' function RANDBETWEEN()
 */
class TestRandBetween {

    private FormulaEvaluator evaluator;
    private Cell bottomValueCell;
    private Cell topValueCell;
    private Cell formulaCell;

    @BeforeEach
    void setUp() {
        Workbook wb = HSSFTestDataSamples.openSampleWorkbook("TestRandBetween.xls");
        evaluator = wb.getCreationHelper().createFormulaEvaluator();

        Sheet sheet = wb.createSheet("RandBetweenSheet");
        Row row = sheet.createRow(0);
        bottomValueCell = row.createCell(0);
        topValueCell = row.createCell(1);
        formulaCell = row.createCell(2, CellType.FORMULA);
    }

    /**
     * Check where values are the same
     */
    @Test
    void testRandBetweenSameValues() {
        evaluator.clearAllCachedResultValues();
        formulaCell.setCellFormula("RANDBETWEEN(1,1)");
        evaluator.evaluateFormulaCell(formulaCell);
        assertEquals(1, formulaCell.getNumericCellValue(), 0);
        evaluator.clearAllCachedResultValues();
        formulaCell.setCellFormula("RANDBETWEEN(-1,-1)");
        evaluator.evaluateFormulaCell(formulaCell);
        assertEquals(-1, formulaCell.getNumericCellValue(), 0);

    }

    @Test
    void testRandBetweenLargeLongs() {
        for (int i = 0; i < 100; i++) {
            evaluator.clearAllCachedResultValues();
            formulaCell.setCellFormula("RANDBETWEEN(0,9999999999)");
            evaluator.evaluateFormulaCell(formulaCell);
            double value = formulaCell.getNumericCellValue();
            assertTrue(value >= 0.0, "rand is greater than or equal to lowerbound");
            assertTrue(value <= 9999999999.0, "rand is less than or equal to upperbound");
        }
    }

    /**
     * Check special case where rounded up bottom value is greater than
     * top value.
     */
    @Test
    void testRandBetweenSpecialCase() {
        bottomValueCell.setCellValue(0.05);
        topValueCell.setCellValue(0.1);
        formulaCell.setCellFormula("RANDBETWEEN($A$1,$B$1)");
        evaluator.clearAllCachedResultValues();
        evaluator.evaluateFormulaCell(formulaCell);
        assertEquals(1, formulaCell.getNumericCellValue(), 0);
        bottomValueCell.setCellValue(-0.1);
        topValueCell.setCellValue(-0.05);
        formulaCell.setCellFormula("RANDBETWEEN($A$1,$B$1)");
        evaluator.clearAllCachedResultValues();
        evaluator.evaluateFormulaCell(formulaCell);
        assertEquals(0, formulaCell.getNumericCellValue(), 0);
        bottomValueCell.setCellValue(-1.1);
        topValueCell.setCellValue(-1.05);
        formulaCell.setCellFormula("RANDBETWEEN($A$1,$B$1)");
        evaluator.clearAllCachedResultValues();
        evaluator.evaluateFormulaCell(formulaCell);
        assertEquals(-1, formulaCell.getNumericCellValue(), 0);
        bottomValueCell.setCellValue(-1.1);
        topValueCell.setCellValue(-1.1);
        formulaCell.setCellFormula("RANDBETWEEN($A$1,$B$1)");
        evaluator.clearAllCachedResultValues();
        evaluator.evaluateFormulaCell(formulaCell);
        assertEquals(-1, formulaCell.getNumericCellValue(), 0);
    }

    /**
     * Check top value of BLANK which Excel will evaluate as 0
     */
    @Test
    void testRandBetweenTopBlank() {
        bottomValueCell.setCellValue(-1);
        topValueCell.setBlank();
        formulaCell.setCellFormula("RANDBETWEEN($A$1,$B$1)");
        evaluator.clearAllCachedResultValues();
        evaluator.evaluateFormulaCell(formulaCell);
        assertTrue(formulaCell.getNumericCellValue() == 0 || formulaCell.getNumericCellValue() == -1);

    }
    /**
     * Check where input values are of wrong type
     */
    @Test
    void testRandBetweenWrongInputTypes() {
        // Check case where bottom input is of the wrong type
        bottomValueCell.setCellValue("STRING");
        topValueCell.setCellValue(1);
        formulaCell.setCellFormula("RANDBETWEEN($A$1,$B$1)");
        evaluator.clearAllCachedResultValues();
        evaluator.evaluateFormulaCell(formulaCell);
        assertEquals(CellType.ERROR, formulaCell.getCachedFormulaResultType());
        assertEquals(ErrorEval.VALUE_INVALID.getErrorCode(), formulaCell.getErrorCellValue());


        // Check case where top input is of the wrong type
        bottomValueCell.setCellValue(1);
        topValueCell.setCellValue("STRING");
        formulaCell.setCellFormula("RANDBETWEEN($A$1,$B$1)");
        evaluator.clearAllCachedResultValues();
        evaluator.evaluateFormulaCell(formulaCell);
        assertEquals(CellType.ERROR, formulaCell.getCachedFormulaResultType());
        assertEquals(ErrorEval.VALUE_INVALID.getErrorCode(), formulaCell.getErrorCellValue());

        // Check case where both inputs are of wrong type
        bottomValueCell.setCellValue("STRING");
        topValueCell.setCellValue("STRING");
        formulaCell.setCellFormula("RANDBETWEEN($A$1,$B$1)");
        evaluator.clearAllCachedResultValues();
        evaluator.evaluateFormulaCell(formulaCell);
        assertEquals(CellType.ERROR, formulaCell.getCachedFormulaResultType());
        assertEquals(ErrorEval.VALUE_INVALID.getErrorCode(), formulaCell.getErrorCellValue());
    }

    /**
     * Check case where bottom is greater than top
     */
    @Test
    void testRandBetweenBottomGreaterThanTop() {
        // Check case where bottom is greater than top
        bottomValueCell.setCellValue(1);
        topValueCell.setCellValue(0);
        formulaCell.setCellFormula("RANDBETWEEN($A$1,$B$1)");
        evaluator.clearAllCachedResultValues();
        evaluator.evaluateFormulaCell(formulaCell);
        assertEquals(CellType.ERROR, formulaCell.getCachedFormulaResultType());
        assertEquals(ErrorEval.NUM_ERROR.getErrorCode(), formulaCell.getErrorCellValue());
        bottomValueCell.setCellValue(1);
        topValueCell.setBlank();
        formulaCell.setCellFormula("RANDBETWEEN($A$1,$B$1)");
        evaluator.clearAllCachedResultValues();
        evaluator.evaluateFormulaCell(formulaCell);
        assertEquals(CellType.ERROR, formulaCell.getCachedFormulaResultType());
        assertEquals(ErrorEval.NUM_ERROR.getErrorCode(), formulaCell.getErrorCellValue());
    }

    /**
     * Boundary check of Double MIN and MAX values
     */
    @Test
    void testRandBetweenBoundaryCheck() {
        bottomValueCell.setCellValue(Double.MIN_VALUE);
        topValueCell.setCellValue(Double.MAX_VALUE);
        formulaCell.setCellFormula("RANDBETWEEN($A$1,$B$1)");
        evaluator.clearAllCachedResultValues();
        evaluator.evaluateFormulaCell(formulaCell);
        assertTrue(formulaCell.getNumericCellValue() >= Double.MIN_VALUE && formulaCell.getNumericCellValue() <= Double.MAX_VALUE);
    }
}