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Java example source code file (MutableIntTest.java)

This example Java source code file (MutableIntTest.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

mutableint, mutableinttest, mutablelong, number, test

The MutableIntTest.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.lang3.mutable;

import org.junit.Test;
import static org.junit.Assert.*;

/**
 * JUnit tests.
 * 
 * @see MutableInt
 */
public class MutableIntTest {

    // ----------------------------------------------------------------
    @Test
    public void testConstructors() {
        assertEquals(0, new MutableInt().intValue());
        
        assertEquals(1, new MutableInt(1).intValue());
        
        assertEquals(2, new MutableInt(Integer.valueOf(2)).intValue());
        assertEquals(3, new MutableInt(new MutableLong(3)).intValue());

        assertEquals(2, new MutableInt("2").intValue());

    }

    @Test(expected=NullPointerException.class)
    public void testConstructorNull() {
        new MutableInt((Number)null);
    }

    @Test
    public void testGetSet() {
        final MutableInt mutNum = new MutableInt(0);
        assertEquals(0, new MutableInt().intValue());
        assertEquals(Integer.valueOf(0), new MutableInt().getValue());
        
        mutNum.setValue(1);
        assertEquals(1, mutNum.intValue());
        assertEquals(Integer.valueOf(1), mutNum.getValue());
        
        mutNum.setValue(Integer.valueOf(2));
        assertEquals(2, mutNum.intValue());
        assertEquals(Integer.valueOf(2), mutNum.getValue());
        
        mutNum.setValue(new MutableLong(3));
        assertEquals(3, mutNum.intValue());
        assertEquals(Integer.valueOf(3), mutNum.getValue());
    }

    @Test(expected=NullPointerException.class)
    public void testSetNull() {
        final MutableInt mutNum = new MutableInt(0);
        mutNum.setValue(null);
    }

    @Test
    public void testEquals() {
        this.testEquals(new MutableInt(0), new MutableInt(0), new MutableInt(1));
        // Should Numbers be supported? GaryG July-21-2005.
        //this.testEquals(mutNumA, Integer.valueOf(0), mutNumC);
    }

    /**
     * @param numA must not be a 0 Integer; must not equal numC.
     * @param numB must equal numA; must not equal numC.
     * @param numC must not equal numA; must not equal numC.
     */
    void testEquals(final Number numA, final Number numB, final Number numC) {
        assertTrue(numA.equals(numA));
        assertTrue(numA.equals(numB));
        assertTrue(numB.equals(numA));
        assertTrue(numB.equals(numB));
        assertFalse(numA.equals(numC));
        assertFalse(numB.equals(numC));
        assertTrue(numC.equals(numC));
        assertFalse(numA.equals(null));
        assertFalse(numA.equals(Integer.valueOf(0)));
        assertFalse(numA.equals("0"));
    }

    @Test
    public void testHashCode() {
        final MutableInt mutNumA = new MutableInt(0);
        final MutableInt mutNumB = new MutableInt(0);
        final MutableInt mutNumC = new MutableInt(1);

        assertTrue(mutNumA.hashCode() == mutNumA.hashCode());
        assertTrue(mutNumA.hashCode() == mutNumB.hashCode());
        assertFalse(mutNumA.hashCode() == mutNumC.hashCode());
        assertTrue(mutNumA.hashCode() == Integer.valueOf(0).hashCode());
    }

    @Test
    public void testCompareTo() {
        final MutableInt mutNum = new MutableInt(0);

        assertEquals(0, mutNum.compareTo(new MutableInt(0)));
        assertEquals(+1, mutNum.compareTo(new MutableInt(-1)));
        assertEquals(-1, mutNum.compareTo(new MutableInt(1)));
    }

    @Test(expected=NullPointerException.class)
    public void testCompareToNull() {
        final MutableInt mutNum = new MutableInt(0);
        mutNum.compareTo(null);
    }

    @Test
    public void testPrimitiveValues() {
        final MutableInt mutNum = new MutableInt(1);
        
        assertEquals( (byte) 1, mutNum.byteValue() );
        assertEquals( (short) 1, mutNum.shortValue() );
        assertEquals( 1.0F, mutNum.floatValue(), 0 );
        assertEquals( 1.0, mutNum.doubleValue(), 0 );
        assertEquals( 1L, mutNum.longValue() );
    }

    @Test
    public void testToInteger() {
        assertEquals(Integer.valueOf(0), new MutableInt(0).toInteger());
        assertEquals(Integer.valueOf(123), new MutableInt(123).toInteger());
    }

    @Test
    public void testIncrement() {
        final MutableInt mutNum = new MutableInt(1);
        mutNum.increment();
        
        assertEquals(2, mutNum.intValue());
        assertEquals(2L, mutNum.longValue());
    }

    @Test
    public void testIncrementAndGet() {
        final MutableInt mutNum = new MutableInt((int) 1);
        int result = mutNum.incrementAndGet();

        assertEquals(2, result);
        assertEquals(2, mutNum.intValue());
        assertEquals(2L, mutNum.longValue());
    }

    @Test
    public void testGetAndIncrement() {
        final MutableInt mutNum = new MutableInt((int) 1);
        int result = mutNum.getAndIncrement();

        assertEquals(1, result);
        assertEquals(2, mutNum.intValue());
        assertEquals(2L, mutNum.longValue());
    }

    @Test
    public void testDecrement() {
        final MutableInt mutNum = new MutableInt(1);
        mutNum.decrement();
        
        assertEquals(0, mutNum.intValue());
        assertEquals(0L, mutNum.longValue());
    }

    @Test
    public void testDecrementAndGet() {
        final MutableInt mutNum = new MutableInt((int) 1);
        int result = mutNum.decrementAndGet();

        assertEquals(0, result);
        assertEquals(0, mutNum.intValue());
        assertEquals(0L, mutNum.longValue());
    }

    @Test
    public void testGetAndDecrement() {
        final MutableInt mutNum = new MutableInt((int) 1);
        int result = mutNum.getAndDecrement();

        assertEquals(1, result);
        assertEquals(0, mutNum.intValue());
        assertEquals(0L, mutNum.longValue());
    }

    @Test
    public void testAddValuePrimitive() {
        final MutableInt mutNum = new MutableInt(1);
        mutNum.add(1);
        
        assertEquals(2, mutNum.intValue());
        assertEquals(2L, mutNum.longValue());
    }

    @Test
    public void testAddValueObject() {
        final MutableInt mutNum = new MutableInt(1);
        mutNum.add(Integer.valueOf(1));
        
        assertEquals(2, mutNum.intValue());
        assertEquals(2L, mutNum.longValue());
    }

    @Test
    public void testGetAndAddValuePrimitive() {
        final MutableInt mutableInteger = new MutableInt((int)0);
        int result = mutableInteger.getAndAdd((int) 1);

        assertEquals((int) 0, result);
        assertEquals((int) 1, mutableInteger.intValue());
    }

    @Test
    public void testGetAndAddValueObject() {
        final MutableInt mutableInteger = new MutableInt((int)0);
        int result = mutableInteger.getAndAdd(Integer.valueOf((int) 1));

        assertEquals((int) 0, result);
        assertEquals((int) 1, mutableInteger.intValue());
    }

    @Test
    public void testAddAndGetValuePrimitive() {
        final MutableInt mutableInteger = new MutableInt((int)0);
        int result = mutableInteger.addAndGet((int) 1);

        assertEquals((int) 1, result);
        assertEquals((int) 1, mutableInteger.intValue());
    }

    @Test
    public void testAddAndGetValueObject() {
        final MutableInt mutableInteger = new MutableInt((int)0);
        int result = mutableInteger.addAndGet(Integer.valueOf((int) 1));

        assertEquals((int) 1, result);
        assertEquals((int) 1, mutableInteger.intValue());
    }

    @Test
    public void testSubtractValuePrimitive() {
        final MutableInt mutNum = new MutableInt(1);
        mutNum.subtract(1);
        
        assertEquals(0, mutNum.intValue());
        assertEquals(0L, mutNum.longValue());
    }

    @Test
    public void testSubtractValueObject() {
        final MutableInt mutNum = new MutableInt(1);
        mutNum.subtract(Integer.valueOf(1));
        
        assertEquals(0, mutNum.intValue());
        assertEquals(0L, mutNum.longValue());
    }

    @Test
    public void testToString() {
        assertEquals("0", new MutableInt(0).toString());
        assertEquals("10", new MutableInt(10).toString());
        assertEquals("-123", new MutableInt(-123).toString());
    }

}

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