PresentValueTest.java

/*
 *  Copyright (c) 2012, 2013, Trivadis (Anatole Tresch), Werner Keil.
 *
 *  Licensed 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
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
package org.javamoney.calc.common;

import static org.junit.Assert.assertEquals;

import java.math.BigDecimal;
import java.math.RoundingMode;
import javax.money.*;

import org.javamoney.moneta.Money;
import org.junit.Test;

/**
 * Tests for the {@link org.javamoney.calc.common.PresentValue} formula calculator.
 * @see http://www.financeformulas.net/Present_Value.html#calcHeader
 */
public class PresentValueTest{

    /**
     * Method: of(Rate rate, int periods)
     */
    @Test
    public void testOfAndApply() throws Exception {
        Money money = Money.of(100, "CHF");
        MonetaryOperator rounding = Monetary.getRounding(RoundingQueryBuilder.of().setScale(2).set(RoundingMode.HALF_EVEN)
                .build());
        assertEquals(Money.of(BigDecimal.valueOf(95.24), "CHF"), money.with(PresentValue.of(Rate.of(0.05), 1)).with(rounding));
        assertEquals(Money.of(BigDecimal.valueOf(90.70), "CHF"), money.with(PresentValue.of(Rate.of(0.05), 2)).with(rounding));
        assertEquals(Money.of(BigDecimal.valueOf(47.51), "CHF"), money.with(PresentValue.of(Rate.of(0.07), 11)).with(rounding));

        assertEquals(Money.of(BigDecimal.valueOf(100.00), "CHF"), money.with(PresentValue.of(Rate.of(0.05), 0)).with(rounding));
        assertEquals(Money.of(BigDecimal.valueOf(100.00), "CHF"), money.with(PresentValue.of(Rate.of(-0.05), 0)).with(rounding));

        assertEquals(Money.of(BigDecimal.valueOf(105.26), "CHF"), money.with(PresentValue.of(Rate.of(-0.05), 1)).with(rounding));
        assertEquals(Money.of(BigDecimal.valueOf(110.80), "CHF"), money.with(PresentValue.of(Rate.of(-0.05), 2)).with(rounding));
        assertEquals(Money.of(BigDecimal.valueOf(222.17), "CHF"), money.with(PresentValue.of(Rate.of(-0.07), 11)).with(rounding));
    }

    /**
     * Method: calculate(MonetaryAmount amount, Rate rate, int periods)
     */
    @Test
    public void testCalculate() throws Exception {
        Money money = Money.of(100, "CHF");
        MonetaryOperator rounding = Monetary.getRounding(RoundingQueryBuilder.of().setScale(2).set(RoundingMode.HALF_EVEN)
                .build());
        assertEquals(Money.of(BigDecimal.valueOf(95.24), "CHF"), PresentValue.calculate(money, Rate.of(0.05), 1).with(rounding));
        assertEquals(Money.of(BigDecimal.valueOf(90.70), "CHF"), PresentValue.calculate(money, Rate.of(0.05), 2).with(rounding));
        assertEquals(Money.of(BigDecimal.valueOf(47.51), "CHF"), PresentValue.calculate(money, Rate.of(0.07), 11).with(rounding));
    }

    /**
     * Method: toString()
     */
    @Test
    public void testToString() throws Exception {
        assertEquals("PresentValue{rate=Rate[0.05], periods=1}", PresentValue.of(Rate.of(0.05), 1).toString());
        assertEquals("PresentValue{rate=Rate[0.05], periods=2}", PresentValue.of(Rate.of(0.05), 2).toString());
        assertEquals("PresentValue{rate=Rate[0.07], periods=11}", PresentValue.of(Rate.of(0.07), 11).toString());
    }

}