TestYearFracCalculator.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
   the License.  You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

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   distributed under the License is distributed on an "AS IS" BASIS,
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   See the License for the specific language governing permissions and
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package org.apache.poi.ss.formula.atp;

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

import java.util.Calendar;

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

/**
 * Specific test cases for YearFracCalculator
 */
final class TestYearFracCalculator {

    @Test
    void testBasis1() {
        confirm(md(1999, 1, 1), md(1999, 4, 5), 1, 0.257534247);
        confirm(md(1999, 4, 1), md(1999, 4, 5), 1, 0.010958904);
        confirm(md(1999, 4, 1), md(1999, 4, 4), 1, 0.008219178);
        confirm(md(1999, 4, 2), md(1999, 4, 5), 1, 0.008219178);
        confirm(md(1999, 3, 31), md(1999, 4, 3), 1, 0.008219178);
        confirm(md(1999, 4, 5), md(1999, 4, 8), 1, 0.008219178);
        confirm(md(1999, 4, 4), md(1999, 4, 7), 1, 0.008219178);
        confirm(md(2000, 2, 5), md(2000, 6, 1), 0, 0.322222222);
    }

    private void confirm(double startDate, double endDate, int basis, double expectedValue) {
        double actualValue;
        try {
            actualValue = YearFracCalculator.calculate(startDate, endDate, basis);
        } catch (EvaluationException e) {
            throw new RuntimeException(e);
        }
        double diff = actualValue - expectedValue;
        if (Math.abs(diff) >  0.000000001) {
            double hours = diff * 365 * 24;
            System.out.println(startDate + " " + endDate + " off by " + hours + " hours");
            assertEquals(expectedValue, actualValue, 0.000000001);
        }

    }

    private static double md(int year, int month, int day) {
        Calendar c = LocaleUtil.getLocaleCalendar(year, month-1, day);
        return DateUtil.getExcelDate(c.getTime());
    }
}