TestWeekdayFunc.java

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   contributor license agreements.  See the NOTICE file distributed with
   this work for additional information regarding copyright ownership.
   The ASF licenses this file to You under the Apache License, Version 2.0
   (the "License"); you may not use this file except in compliance with
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package org.apache.poi.ss.formula.functions;

import org.apache.poi.ss.formula.eval.*;
import org.apache.poi.ss.usermodel.DateUtil;
import org.apache.poi.util.StringUtil;
import org.junit.jupiter.api.Test;

import java.time.LocalDate;

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

/**
 * Tests WEEKDAY(serial_number[, return_type]) excel function
 * https://support.office.com/en-us/article/WEEKDAY-function-60E44483-2ED1-439F-8BD0-E404C190949A
 */
class TestWeekdayFunc {
    private static final double TOLERANCE = 0.001;

    private void assertEvaluateEquals(double expected, double serial_number) {
        String formula = "WEEKDAY(" + serial_number + ")";
        ValueEval[] args = new ValueEval[] { new NumberEval(serial_number) };
        NumberEval result = (NumberEval) WeekdayFunc.instance.evaluate(args, 0, 0);
        assertEquals(expected, result.getNumberValue(), TOLERANCE, formula);
    }
    private void assertEvaluateEquals(double expected, double serial_number, double return_type) {
        String formula = "WEEKDAY(" + serial_number + ", " + return_type + ")";
        ValueEval[] args = new ValueEval[] { new NumberEval(serial_number), new NumberEval(return_type) };
        NumberEval result = (NumberEval) WeekdayFunc.instance.evaluate(args, 0, 0);
        assertEquals(expected, result.getNumberValue(), TOLERANCE, formula);
    }

    @Test
    void testEvaluate() {
        assertEvaluateEquals(2.0,  1.0);
        assertEvaluateEquals(2.0,  1.0, 1.0);
        assertEvaluateEquals(1.0,  1.0, 2.0);
        assertEvaluateEquals(0.0,  1.0, 3.0);
        assertEvaluateEquals(1.0, 1.0, 11.0);
        assertEvaluateEquals(7.0, 1.0, 12.0);
        assertEvaluateEquals(6.0, 1.0, 13.0);
        assertEvaluateEquals(5.0, 1.0, 14.0);
        assertEvaluateEquals(4.0, 1.0, 15.0);
        assertEvaluateEquals(3.0, 1.0, 16.0);
        assertEvaluateEquals(2.0, 1.0, 17.0);


        assertEvaluateEquals(3.0, 39448.0);
        assertEvaluateEquals(3.0, 39448.0, 1.0);
        assertEvaluateEquals(2.0, 39448.0, 2.0);
        assertEvaluateEquals(1.0, 39448.0, 3.0);
        assertEvaluateEquals(2.0, 39448.0, 11.0);
        assertEvaluateEquals(1.0, 39448.0, 12.0);
        assertEvaluateEquals(7.0, 39448.0, 13.0);
        assertEvaluateEquals(6.0, 39448.0, 14.0);
        assertEvaluateEquals(5.0, 39448.0, 15.0);
        assertEvaluateEquals(4.0, 39448.0, 16.0);
        assertEvaluateEquals(3.0, 39448.0, 17.0);
    }


    @Test
    void testMicrosoftExamples() {
        double date = DateUtil.getExcelDate(LocalDate.parse("2008-02-14"));
        assertEvaluateEquals(5.0, date);
        assertEvaluateEquals(4.0, date, 2);
        assertEvaluateEquals(3.0, date, 3);
    }

    // for testing invalid invocations
    private void assertEvaluateEquals(String message, ErrorEval expected, ValueEval... args) {
        String formula = "WEEKDAY(" + StringUtil.join(args, ", ") + ")";
        ValueEval result = WeekdayFunc.instance.evaluate(args, 0, 0);
        assertEquals(expected, result, formula + ": " + message);
    }

    @Test
    void testEvaluateInvalid() {
        assertEvaluateEquals("no args",       ErrorEval.VALUE_INVALID);
        assertEvaluateEquals("too many args", ErrorEval.VALUE_INVALID, new NumberEval(1.0), new NumberEval(1.0), new NumberEval(1.0));
        assertEvaluateEquals("negative date", ErrorEval.NUM_ERROR, new NumberEval(-1.0));
        assertEvaluateEquals("cannot coerce serial_number to number", ErrorEval.VALUE_INVALID, new StringEval(""));
        assertEvaluateEquals("cannot coerce return_type to number",   ErrorEval.VALUE_INVALID, new StringEval("1"), new StringEval(""));
        assertEvaluateEquals("return_type is blank",   ErrorEval.NUM_ERROR, new StringEval("2"), BlankEval.instance);
        assertEvaluateEquals("return_type is missing", ErrorEval.NUM_ERROR, new StringEval("3"), MissingArgEval.instance);
        assertEvaluateEquals("invalid return_type",    ErrorEval.NUM_ERROR, new NumberEval(1.0), new NumberEval(18.0));
    }
}