RationalTest.java

/*
 * Copyright (c) 2009, Harald Kuhr
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * * Redistributions of source code must retain the above copyright notice, this
 *   list of conditions and the following disclaimer.
 *
 * * Redistributions in binary form must reproduce the above copyright notice,
 *   this list of conditions and the following disclaimer in the documentation
 *   and/or other materials provided with the distribution.
 *
 * * Neither the name of the copyright holder nor the names of its
 *   contributors may be used to endorse or promote products derived from
 *   this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package com.twelvemonkeys.imageio.metadata.exif;

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

/**
 * RationalTest
 *
 * @author <a href="mailto:harald.kuhr@gmail.com">Harald Kuhr</a>
 * @author last modified by $Author: haraldk$
 * @version $Id: RationalTest.java,v 1.0 Nov 18, 2009 3:23:17 PM haraldk Exp$
 */
@SuppressWarnings("deprecation")
public class RationalTest {
    @Test
    public void testZeroDenominator() {
        assertThrows(IllegalArgumentException.class, () -> new Rational(1, 0));
    }

    @Test
    public void testLongMinValueNumerator() {
        assertThrows(IllegalArgumentException.class, () -> new Rational(Long.MIN_VALUE, 1));
    }

    @Test
    public void testLongMinValueDenominator() {
        assertThrows(IllegalArgumentException.class, () -> new Rational(1, Long.MIN_VALUE));
    }

    @Test
    public void testEquals() {
        assertEquals(new Rational(0, 1), new Rational(0, 999));
        assertEquals(new Rational(0, 1), new Rational(0, -1));
        assertEquals(new Rational(1, 2), new Rational(1000000, 2000000));
        assertEquals(new Rational(1, -2), new Rational(-1, 2));

        Rational x = new Rational(1, -2);
        Rational y = new Rational(-1000000, 2000000);
        assertEquals(x, y);
        assertEquals(x.numerator(), y.numerator());
        assertEquals(x.denominator(), y.denominator());
    }

    @Test
    public void testEqualsBoundaries() {
        assertEquals(new Rational(Long.MAX_VALUE, Long.MAX_VALUE), new Rational(1, 1));

        // NOTE: Math.abs(Long.MIN_VALUE) == Long.MIN_VALUE... :-P
        assertEquals(new Rational(Long.MIN_VALUE + 1, Long.MIN_VALUE + 1), new Rational(1, 1));
        assertEquals(new Rational(Long.MIN_VALUE + 1, Long.MAX_VALUE), new Rational(-1, 1));
        assertEquals(new Rational(Long.MAX_VALUE, Long.MIN_VALUE + 1), new Rational(-1, 1));
    }
}