src/test/org/apache/commons/lang/mutable/MutableDoubleTest.java

/*
 * Copyright 2002-2004 The Apache Software Foundation.
 * 
 * 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.apache.commons.lang.mutable;

import junit.framework.Test;
import junit.framework.TestCase;
import junit.framework.TestSuite;
import junit.textui.TestRunner;

/**
 * JUnit tests.
 * 
 * @version $Id: MutableDoubleTest.java,v 1.3 2004/12/26 02:35:47 bayard Exp $
 * @see MutableDouble
 */
public class MutableDoubleTest extends TestCase {

    public MutableDoubleTest(String testName) {
        super(testName);
    }

    public static void main(String[] args) {
        TestRunner.run(suite());
    }

    public static Test suite() {
        return new TestSuite(MutableDoubleTest.class);
    }

    // ----------------------------------------------------------------
    public void testConstructors() {
        assertEquals(0d, new MutableDouble().doubleValue(), 0.0001d);
        
        assertEquals(1d, new MutableDouble(1d).doubleValue(), 0.0001d);
        
        assertEquals(2d, new MutableDouble(new Double(2d)).doubleValue(), 0.0001d);
        assertEquals(3d, new MutableDouble(new MutableDouble(3d)).doubleValue(), 0.0001d);
        try {
            new MutableDouble(null);
            fail();
        } catch (NullPointerException ex) {}
    }

    public void testGetSet() {
        final MutableDouble mutNum = new MutableDouble(0d);
        assertEquals(0d, new MutableDouble().doubleValue(), 0.0001d);
        assertEquals(new Double(0), new MutableDouble().getValue());
        
        mutNum.setValue(1);
        assertEquals(1d, mutNum.doubleValue(), 0.0001d);
        assertEquals(new Double(1d), mutNum.getValue());
        
        mutNum.setValue(new Double(2d));
        assertEquals(2d, mutNum.doubleValue(), 0.0001d);
        assertEquals(new Double(2d), mutNum.getValue());
        
        mutNum.setValue(new MutableDouble(3d));
        assertEquals(3d, mutNum.doubleValue(), 0.0001d);
        assertEquals(new Double(3d), mutNum.getValue());
        try {
            mutNum.setValue(null);
            fail();
        } catch (NullPointerException ex) {}
        try {
            mutNum.setValue("0");
            fail();
        } catch (ClassCastException ex) {}
    }

    public void testNanInfinite() {
        MutableDouble mutNum = new MutableDouble(Double.NaN);
        assertEquals(true, mutNum.isNaN());
        
        mutNum = new MutableDouble(Double.POSITIVE_INFINITY);
        assertEquals(true, mutNum.isInfinite());
        
        mutNum = new MutableDouble(Double.NEGATIVE_INFINITY);
        assertEquals(true, mutNum.isInfinite());
    }

    public void testEquals() {
        final MutableDouble mutNumA = new MutableDouble(0d);
        final MutableDouble mutNumB = new MutableDouble(0d);
        final MutableDouble mutNumC = new MutableDouble(1d);

        assertEquals(true, mutNumA.equals(mutNumA));
        assertEquals(true, mutNumA.equals(mutNumB));
        assertEquals(true, mutNumB.equals(mutNumA));
        assertEquals(true, mutNumB.equals(mutNumB));
        assertEquals(false, mutNumA.equals(mutNumC));
        assertEquals(false, mutNumB.equals(mutNumC));
        assertEquals(true, mutNumC.equals(mutNumC));
        assertEquals(false, mutNumA.equals(null));
        assertEquals(false, mutNumA.equals(new Double(0d)));
        assertEquals(false, mutNumA.equals("0"));
    }

    public void testHashCode() {
        final MutableDouble mutNumA = new MutableDouble(0d);
        final MutableDouble mutNumB = new MutableDouble(0d);
        final MutableDouble mutNumC = new MutableDouble(1d);

        assertEquals(true, mutNumA.hashCode() == mutNumA.hashCode());
        assertEquals(true, mutNumA.hashCode() == mutNumB.hashCode());
        assertEquals(false, mutNumA.hashCode() == mutNumC.hashCode());
        assertEquals(true, mutNumA.hashCode() == new Double(0d).hashCode());
    }

    public void testCompareTo() {
        final MutableDouble mutNum = new MutableDouble(0d);

        assertEquals(0, mutNum.compareTo(new MutableDouble(0d)));
        assertEquals(+1, mutNum.compareTo(new MutableDouble(-1d)));
        assertEquals(-1, mutNum.compareTo(new MutableDouble(1d)));
        try {
            mutNum.compareTo(null);
            fail();
        } catch (NullPointerException ex) {}
        try {
            mutNum.compareTo(new Double(0d));
            fail();
        } catch (ClassCastException ex) {}
        try {
            mutNum.compareTo("0");
            fail();
        } catch (ClassCastException ex) {}
    }

    public void testPrimitiveValues() {
        MutableDouble mutNum = new MutableDouble(1.7);
        
        assertEquals( 1.7F, mutNum.floatValue(), 0 );
        assertEquals( 1, mutNum.intValue() );
        assertEquals( 1L, mutNum.longValue() );
    }

    public void testToString() {
        assertEquals("0.0", new MutableDouble(0d).toString());
        assertEquals("10.0", new MutableDouble(10d).toString());
        assertEquals("-123.0", new MutableDouble(-123d).toString());
    }

}