ByteUtilities/test/dorkbox/bytes/UIntegerTest.java

/*
 * Copyright (c) 2011-2013, Lukas Eder, lukas.eder@gmail.com
 * All rights reserved.
 * <p/>
 * This software is licensed to you under the Apache License, Version 2.0
 * (the "License"); You may obtain a copy of the License at
 * <p/>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p/>
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * <p/>
 * . Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 * <p/>
 * . 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.
 * <p/>
 * . Neither the name "jOOU" nor the names of its contributors may be
 * used to endorse or promote products derived from this software without
 * specific prior written permission.
 * <p/>
 * 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 OWNER 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, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */
package dorkbox.bytes;

import static dorkbox.bytes.Unsigned.uint;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;

import org.junit.Test;

public
class UIntegerTest {
    private static final int CACHE_SIZE = 256;
    private static final int NEAR_MISS_OFFSET = 4;

    @Test
    public
    void testValueOfLong() {
        for (long l = 01; l <= UInteger.MAX_VALUE; l <<= 1) {
            assertEquals(l, uint(l).longValue());
        }
    }

    @Test
    public
    void testValueOfLongCachingShift() {
        for (long l = 01; l < CACHE_SIZE; l <<= 1) {
            UInteger a = uint(l);
            UInteger b = uint(l);
            assertTrue(a == b);
        }
    }

    @Test
    public
    void testValueOfLongCachingNear() {
        for (long l = CACHE_SIZE - NEAR_MISS_OFFSET; l < CACHE_SIZE; l++) {
            UInteger a = uint(l);
            UInteger b = uint(l);
            assertTrue(a == b);
        }
    }

    @Test
    public
    void testValueOfLongNoCachingShift() {
        for (long l = CACHE_SIZE; l <= CACHE_SIZE; l <<= 1) {
            UInteger a = uint(l);
            UInteger b = uint(l);
            assertFalse(a == b);
        }
    }

    @Test
    public
    void testValueOfLongNoCachingNear() {
        for (long l = CACHE_SIZE; l <= CACHE_SIZE + NEAR_MISS_OFFSET; l++) {
            UInteger a = uint(l);
            UInteger b = uint(l);
            assertFalse(a == b);
        }
    }

    @Test
    public
    void testValueOfLongInvalid() {
        try {
            uint(UInteger.MIN_VALUE - 1);
            fail();
        } catch (NumberFormatException e) {
        }
        try {
            uint(UInteger.MAX_VALUE + 1);
            fail();
        } catch (NumberFormatException e) {
        }
    }

    @Test
    public
    void testSerializeDeserialize() throws ClassNotFoundException, IOException {
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        ObjectOutputStream oos = new ObjectOutputStream(baos);
        ByteArrayInputStream bais;
        ObjectInputStream ois;
        UInteger expected = uint(42);
        UInteger input = uint(42);
        UInteger actual;
        Object o;

        oos.writeObject(input);
        oos.close();
        bais = new ByteArrayInputStream(baos.toByteArray());
        ois = new ObjectInputStream(bais);
        o = ois.readObject();
        if (!(o instanceof UInteger)) {
            fail();
        }
        actual = (UInteger) o;
        assertEquals(expected, actual); // same value
        assertTrue(expected == actual); // identical objects
    }
}