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Java example source code file (BigFractionFormatTest.java)

This example Java source code file (BigFractionFormatTest.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

before, bigdecimal, bigfraction, bigfractionformat, bigfractionformattest, locale, math, mathparseexception, numberformat, properbigfractionformat, string, test, text, util

The BigFractionFormatTest.java Java example source code

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * 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
 *
 * 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.apache.commons.math3.fraction;

import java.math.BigDecimal;
import java.math.BigInteger;
import java.text.NumberFormat;
import java.util.Locale;

import org.apache.commons.math3.exception.MathParseException;
import org.apache.commons.math3.util.FastMath;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;


public class BigFractionFormatTest {

    BigFractionFormat properFormat = null;
    BigFractionFormat improperFormat = null;

    protected Locale getLocale() {
        return Locale.getDefault();
    }

    @Before
    public void setUp() {
        properFormat = BigFractionFormat.getProperInstance(getLocale());
        improperFormat = BigFractionFormat.getImproperInstance(getLocale());
    }

    @Test
    public void testFormat() {
        BigFraction c = new BigFraction(1, 2);
        String expected = "1 / 2";

        String actual = properFormat.format(c);
        Assert.assertEquals(expected, actual);

        actual = improperFormat.format(c);
        Assert.assertEquals(expected, actual);
    }

    @Test
    public void testFormatNegative() {
        BigFraction c = new BigFraction(-1, 2);
        String expected = "-1 / 2";

        String actual = properFormat.format(c);
        Assert.assertEquals(expected, actual);

        actual = improperFormat.format(c);
        Assert.assertEquals(expected, actual);
    }

    @Test
    public void testFormatZero() {
        BigFraction c = new BigFraction(0, 1);
        String expected = "0 / 1";

        String actual = properFormat.format(c);
        Assert.assertEquals(expected, actual);

        actual = improperFormat.format(c);
        Assert.assertEquals(expected, actual);
    }

    @Test
    public void testFormatImproper() {
        BigFraction c = new BigFraction(5, 3);

        String actual = properFormat.format(c);
        Assert.assertEquals("1 2 / 3", actual);

        actual = improperFormat.format(c);
        Assert.assertEquals("5 / 3", actual);
    }

    @Test
    public void testFormatImproperNegative() {
        BigFraction c = new BigFraction(-5, 3);

        String actual = properFormat.format(c);
        Assert.assertEquals("-1 2 / 3", actual);

        actual = improperFormat.format(c);
        Assert.assertEquals("-5 / 3", actual);
    }

    @Test
    public void testParse() {
        String source = "1 / 2";

        {
            BigFraction c = properFormat.parse(source);
            Assert.assertNotNull(c);
            Assert.assertEquals(BigInteger.ONE, c.getNumerator());
            Assert.assertEquals(BigInteger.valueOf(2l), c.getDenominator());

            c = improperFormat.parse(source);
            Assert.assertNotNull(c);
            Assert.assertEquals(BigInteger.ONE, c.getNumerator());
            Assert.assertEquals(BigInteger.valueOf(2l), c.getDenominator());
        }
    }

    @Test
    public void testParseInteger() {
        String source = "10";
        {
            BigFraction c = properFormat.parse(source);
            Assert.assertNotNull(c);
            Assert.assertEquals(BigInteger.TEN, c.getNumerator());
            Assert.assertEquals(BigInteger.ONE, c.getDenominator());
        }
        {
            BigFraction c = improperFormat.parse(source);
            Assert.assertNotNull(c);
            Assert.assertEquals(BigInteger.TEN, c.getNumerator());
            Assert.assertEquals(BigInteger.ONE, c.getDenominator());
        }
    }

    @Test
    public void testParseInvalid() {
        String source = "a";
        String msg = "should not be able to parse '10 / a'.";
        try {
            properFormat.parse(source);
            Assert.fail(msg);
        } catch (MathParseException ex) {
            // success
        }
        try {
            improperFormat.parse(source);
            Assert.fail(msg);
        } catch (MathParseException ex) {
            // success
        }
    }

    @Test
    public void testParseInvalidDenominator() {
        String source = "10 / a";
        String msg = "should not be able to parse '10 / a'.";
        try {
            properFormat.parse(source);
            Assert.fail(msg);
        } catch (MathParseException ex) {
            // success
        }
        try {
            improperFormat.parse(source);
            Assert.fail(msg);
        } catch (MathParseException ex) {
            // success
        }
    }

    @Test
    public void testParseNegative() {

        {
            String source = "-1 / 2";
            BigFraction c = properFormat.parse(source);
            Assert.assertNotNull(c);
            Assert.assertEquals(-1, c.getNumeratorAsInt());
            Assert.assertEquals(2, c.getDenominatorAsInt());

            c = improperFormat.parse(source);
            Assert.assertNotNull(c);
            Assert.assertEquals(-1, c.getNumeratorAsInt());
            Assert.assertEquals(2, c.getDenominatorAsInt());

            source = "1 / -2";
            c = properFormat.parse(source);
            Assert.assertNotNull(c);
            Assert.assertEquals(-1, c.getNumeratorAsInt());
            Assert.assertEquals(2, c.getDenominatorAsInt());

            c = improperFormat.parse(source);
            Assert.assertNotNull(c);
            Assert.assertEquals(-1, c.getNumeratorAsInt());
            Assert.assertEquals(2, c.getDenominatorAsInt());
        }
    }

    @Test
    public void testParseProper() {
        String source = "1 2 / 3";

        {
            BigFraction c = properFormat.parse(source);
            Assert.assertNotNull(c);
            Assert.assertEquals(5, c.getNumeratorAsInt());
            Assert.assertEquals(3, c.getDenominatorAsInt());
        }

        try {
            improperFormat.parse(source);
            Assert.fail("invalid improper fraction.");
        } catch (MathParseException ex) {
            // success
        }
    }

    @Test
    public void testParseProperNegative() {
        String source = "-1 2 / 3";
        {
            BigFraction c = properFormat.parse(source);
            Assert.assertNotNull(c);
            Assert.assertEquals(-5, c.getNumeratorAsInt());
            Assert.assertEquals(3, c.getDenominatorAsInt());
        }

        try {
            improperFormat.parse(source);
            Assert.fail("invalid improper fraction.");
        } catch (MathParseException ex) {
            // success
        }
    }

    @Test
    public void testParseProperInvalidMinus() {
        String source = "2 -2 / 3";
        try {
            properFormat.parse(source);
            Assert.fail("invalid minus in improper fraction.");
        } catch (MathParseException ex) {
            // expected
        }
        source = "2 2 / -3";
        try {
            properFormat.parse(source);
            Assert.fail("invalid minus in improper fraction.");
        } catch (MathParseException ex) {
            // expected
        }
    }

    @Test
    public void testParseBig() {
        BigFraction f1 =
            improperFormat.parse("167213075789791382630275400487886041651764456874403" +
                                 " / " +
                                 "53225575123090058458126718248444563466137046489291");
        Assert.assertEquals(FastMath.PI, f1.doubleValue(), 0.0);
        BigFraction f2 =
            properFormat.parse("3 " +
                               "7536350420521207255895245742552351253353317406530" +
                               " / " +
                               "53225575123090058458126718248444563466137046489291");
        Assert.assertEquals(FastMath.PI, f2.doubleValue(), 0.0);
        Assert.assertEquals(f1, f2);
        BigDecimal pi =
            new BigDecimal("3.141592653589793238462643383279502884197169399375105820974944592307816406286208998628034825342117068");
        Assert.assertEquals(pi, f1.bigDecimalValue(99, BigDecimal.ROUND_HALF_EVEN));
    }

    @Test
    public void testNumeratorFormat() {
        NumberFormat old = properFormat.getNumeratorFormat();
        NumberFormat nf = NumberFormat.getInstance();
        nf.setParseIntegerOnly(true);
        properFormat.setNumeratorFormat(nf);
        Assert.assertEquals(nf, properFormat.getNumeratorFormat());
        properFormat.setNumeratorFormat(old);

        old = improperFormat.getNumeratorFormat();
        nf = NumberFormat.getInstance();
        nf.setParseIntegerOnly(true);
        improperFormat.setNumeratorFormat(nf);
        Assert.assertEquals(nf, improperFormat.getNumeratorFormat());
        improperFormat.setNumeratorFormat(old);
    }

    @Test
    public void testDenominatorFormat() {
        NumberFormat old = properFormat.getDenominatorFormat();
        NumberFormat nf = NumberFormat.getInstance();
        nf.setParseIntegerOnly(true);
        properFormat.setDenominatorFormat(nf);
        Assert.assertEquals(nf, properFormat.getDenominatorFormat());
        properFormat.setDenominatorFormat(old);

        old = improperFormat.getDenominatorFormat();
        nf = NumberFormat.getInstance();
        nf.setParseIntegerOnly(true);
        improperFormat.setDenominatorFormat(nf);
        Assert.assertEquals(nf, improperFormat.getDenominatorFormat());
        improperFormat.setDenominatorFormat(old);
    }

    @Test
    public void testWholeFormat() {
        ProperBigFractionFormat format = (ProperBigFractionFormat)properFormat;

        NumberFormat old = format.getWholeFormat();
        NumberFormat nf = NumberFormat.getInstance();
        nf.setParseIntegerOnly(true);
        format.setWholeFormat(nf);
        Assert.assertEquals(nf, format.getWholeFormat());
        format.setWholeFormat(old);
    }

    @Test
    public void testLongFormat() {
        Assert.assertEquals("10 / 1", improperFormat.format(10l));
    }

    @Test
    public void testDoubleFormat() {
        Assert.assertEquals("1 / 16", improperFormat.format(0.0625));
    }
}

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