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jfreechart example source code file (BoxAndWhiskerCalculatorTests.java)

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

Java - jfreechart tags/keywords

arraylist, arraylist, boxandwhiskercalculatortests, boxandwhiskeritem, epsilon, epsilon, illegalargumentexception, illegalargumentexception, list, list, test, testcase, util

The jfreechart BoxAndWhiskerCalculatorTests.java source code

/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-2008, by Object Refinery Limited and Contributors.
 *
 * Project Info:  http://www.jfree.org/jfreechart/index.html
 *
 * This library is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 2.1 of the License, or
 * (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
 * License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
 * USA.
 *
 * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
 * in the United States and other countries.]
 *
 * ---------------------------------
 * BoxAndWhiskerCalculatorTests.java
 * ---------------------------------
 * (C) Copyright 2003-2008, by Object Refinery Limited and Contributors.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * Changes
 * -------
 * 28-Aug-2003 : Version 1 (DG);
 *
 */

package org.jfree.data.statistics.junit;

import java.util.ArrayList;
import java.util.List;

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

import org.jfree.data.statistics.BoxAndWhiskerCalculator;
import org.jfree.data.statistics.BoxAndWhiskerItem;

/**
 * Tests for the {@link BoxAndWhiskerCalculator} class.
 */
public class BoxAndWhiskerCalculatorTests extends TestCase {

    /**
     * Returns the tests as a test suite.
     *
     * @return The test suite.
     */
    public static Test suite() {
        return new TestSuite(BoxAndWhiskerCalculatorTests.class);
    }

    /**
     * Constructs a new set of tests.
     *
     * @param name  the name of the tests.
     */
    public BoxAndWhiskerCalculatorTests(String name) {
        super(name);
    }

    /**
     * Some checks for the calculateBoxAndWhiskerStatistics() method.
     */
    public void testCalculateBoxAndWhiskerStatistics() {

        // try null list
        boolean pass = false;
        try {
            BoxAndWhiskerCalculator.calculateBoxAndWhiskerStatistics(null);
        }
        catch (IllegalArgumentException e) {
            pass = true;
        }
        assertTrue(pass);

        // try a list containing a single value
        List values = new ArrayList();
        values.add(new Double(1.1));
        BoxAndWhiskerItem item
            = BoxAndWhiskerCalculator.calculateBoxAndWhiskerStatistics(values);
        assertEquals(1.1, item.getMean().doubleValue(), EPSILON);
        assertEquals(1.1, item.getMedian().doubleValue(), EPSILON);
        assertEquals(1.1, item.getQ1().doubleValue(), EPSILON);
        assertEquals(1.1, item.getQ3().doubleValue(), EPSILON);
    }

    private static final double EPSILON = 0.000000001;

    /**
     * Tests the Q1 calculation.
     */
    public void testCalculateQ1() {

        // try null argument
        boolean pass = false;
        try {
            BoxAndWhiskerCalculator.calculateQ1(null);
        }
        catch (IllegalArgumentException e) {
            pass = true;
        }
        assertTrue(pass);

        List values = new ArrayList();
        double q1 = BoxAndWhiskerCalculator.calculateQ1(values);
        assertTrue(Double.isNaN(q1));
        values.add(new Double(1.0));
        q1 = BoxAndWhiskerCalculator.calculateQ1(values);
        assertEquals(q1, 1.0, EPSILON);
        values.add(new Double(2.0));
        q1 = BoxAndWhiskerCalculator.calculateQ1(values);
        assertEquals(q1, 1.0, EPSILON);
        values.add(new Double(3.0));
        q1 = BoxAndWhiskerCalculator.calculateQ1(values);
        assertEquals(q1, 1.5, EPSILON);
        values.add(new Double(4.0));
        q1 = BoxAndWhiskerCalculator.calculateQ1(values);
        assertEquals(q1, 1.5, EPSILON);
    }

    /**
     * Tests the Q3 calculation.
     */
    public void testCalculateQ3() {
        // try null argument
        boolean pass = false;
        try {
            BoxAndWhiskerCalculator.calculateQ3(null);
        }
        catch (IllegalArgumentException e) {
            pass = true;
        }
        assertTrue(pass);

        List values = new ArrayList();
        double q3 = BoxAndWhiskerCalculator.calculateQ3(values);
        assertTrue(Double.isNaN(q3));
        values.add(new Double(1.0));
        q3 = BoxAndWhiskerCalculator.calculateQ3(values);
        assertEquals(q3, 1.0, EPSILON);
        values.add(new Double(2.0));
        q3 = BoxAndWhiskerCalculator.calculateQ3(values);
        assertEquals(q3, 2.0, EPSILON);
        values.add(new Double(3.0));
        q3 = BoxAndWhiskerCalculator.calculateQ3(values);
        assertEquals(q3, 2.5, EPSILON);
        values.add(new Double(4.0));
        q3 = BoxAndWhiskerCalculator.calculateQ3(values);
        assertEquals(q3, 3.5, EPSILON);
    }

    /**
     * The test case included in bug report 1593149.
     */
    public void test1593149() {
        ArrayList theList = new ArrayList(5);
        theList.add(0, new Double(1.0));
        theList.add(1, new Double(2.0));
        theList.add(2, new Double(Double.NaN));
        theList.add(3, new Double(3.0));
        theList.add(4, new Double(4.0));
        BoxAndWhiskerItem theItem =
            BoxAndWhiskerCalculator.calculateBoxAndWhiskerStatistics(theList);
        assertEquals(1.0, theItem.getMinRegularValue().doubleValue(), EPSILON);
        assertEquals(4.0, theItem.getMaxRegularValue().doubleValue(), EPSILON);
    }
}

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