/* ===========================================================
* JFreeChart : a free chart library for the Java(tm) platform
* ===========================================================
*
* (C) Copyright 2000-2012, 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.
*
* [Oracle and Java are registered trademarks of Oracle and/or its affiliates.
* Other names may be trademarks of their respective owners.]
*
* ---------------------------------
* 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;
import org.junit.Test;
import java.util.ArrayList;
import java.util.List;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;
/**
* Tests for the {@link BoxAndWhiskerCalculator} class.
*/
public class BoxAndWhiskerCalculatorTest {
/**
* Some checks for the calculateBoxAndWhiskerStatistics() method.
*/
@Test
public void testCalculateBoxAndWhiskerStatistics() {
// try null list
try {
BoxAndWhiskerCalculator.calculateBoxAndWhiskerStatistics(null);
fail("IllegalArgumentException should have been thrown on a null key");
}
catch (IllegalArgumentException e) {
assertEquals("Null 'values' argument.", e.getMessage());
}
// try a list containing a single value
List<Number> values = new ArrayList<Number>();
values.add(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.
*/
@Test
public void testCalculateQ1() {
// try null argument
try {
BoxAndWhiskerCalculator.calculateQ1(null);
fail("IllegalArgumentException should have been thrown on a null key");
}
catch (IllegalArgumentException e) {
assertEquals("Null 'values' argument.", e.getMessage());
}
List<Number> values = new ArrayList<Number>();
double q1 = BoxAndWhiskerCalculator.calculateQ1(values);
assertTrue(Double.isNaN(q1));
values.add(1.0);
q1 = BoxAndWhiskerCalculator.calculateQ1(values);
assertEquals(q1, 1.0, EPSILON);
values.add(2.0);
q1 = BoxAndWhiskerCalculator.calculateQ1(values);
assertEquals(q1, 1.0, EPSILON);
values.add(3.0);
q1 = BoxAndWhiskerCalculator.calculateQ1(values);
assertEquals(q1, 1.5, EPSILON);
values.add(4.0);
q1 = BoxAndWhiskerCalculator.calculateQ1(values);
assertEquals(q1, 1.5, EPSILON);
}
/**
* Tests the Q3 calculation.
*/
@Test
public void testCalculateQ3() {
// try null argument
try {
BoxAndWhiskerCalculator.calculateQ3(null);
fail("IllegalArgumentException should have been thrown on a null key");
}
catch (IllegalArgumentException e) {
assertEquals("Null 'values' argument.", e.getMessage());
}
List<Number> values = new ArrayList<Number>();
double q3 = BoxAndWhiskerCalculator.calculateQ3(values);
assertTrue(Double.isNaN(q3));
values.add(1.0);
q3 = BoxAndWhiskerCalculator.calculateQ3(values);
assertEquals(q3, 1.0, EPSILON);
values.add(2.0);
q3 = BoxAndWhiskerCalculator.calculateQ3(values);
assertEquals(q3, 2.0, EPSILON);
values.add(3.0);
q3 = BoxAndWhiskerCalculator.calculateQ3(values);
assertEquals(q3, 2.5, EPSILON);
values.add(4.0);
q3 = BoxAndWhiskerCalculator.calculateQ3(values);
assertEquals(q3, 3.5, EPSILON);
}
/**
* The test case included in bug report 1593149.
*/
@Test
public void test1593149() {
ArrayList<Number> theList = new ArrayList<Number>(5);
theList.add(0, 1.0);
theList.add(1, 2.0);
theList.add(2, Double.NaN);
theList.add(3, 3.0);
theList.add(4, 4.0);
BoxAndWhiskerItem theItem =
BoxAndWhiskerCalculator.calculateBoxAndWhiskerStatistics(theList);
assertEquals(1.0, theItem.getMinRegularValue().doubleValue(), EPSILON);
assertEquals(4.0, theItem.getMaxRegularValue().doubleValue(), EPSILON);
}
}