boxandwhiskercalculatortests.java

制作图表的好工具

/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-2005, 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 2003-2005, by Object Refinery Limited and Contributors.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * $Id: BoxAndWhiskerCalculatorTests.java,v 1.4.2.1 2005/10/25 21:34:59 mungady Exp $
 *
 * 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;

/**
 * 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);
    }
    
    private static final double EPSILON = 0.000000001;
    
    /**
     * Tests the Q1 calculation.
     */
    public void testCalculateQ1() {
        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() {
        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);
    }
}