/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/*
* Copyright (C) 2007 University of Waikato, Hamilton, New Zealand
*/
package weka.filters.unsupervised.instance;
import weka.core.InstanceComparator;
import weka.core.Instances;
import weka.filters.AbstractFilterTest;
import weka.filters.Filter;
import junit.framework.Test;
import junit.framework.TestSuite;
/**
* Tests ReservoirSample. Run from the command line with: <p/>
* java weka.filters.unsupervised.instance.ReservoirSampleTest
*
* @author Mark Hall (mhall{[at]}pentaho{[dot]}org)
* @version $Revision: 5563 $
*/
public class ReservoirSampleTest
extends AbstractFilterTest {
/** for comparing the instances */
protected InstanceComparator m_Comparator;
public ReservoirSampleTest(String name) {
super(name);
}
protected void setUp() throws Exception {
super.setUp();
m_Comparator = new InstanceComparator(true);
}
/** Creates a default ReservoirSample */
public Filter getFilter() {
ReservoirSample r = new ReservoirSample();
return r;
}
public void testTypical() {
m_Filter = getFilter();
Instances result = useFilter();
assertEquals(m_Instances.numAttributes(), result.numAttributes());
assertEquals(m_Instances.numInstances(), result.numInstances());
// instances should be indentical as default settings ask for
// a larger sample than there is number of instances in the test
// dataset
boolean equal = true;
for (int i = 0; i < m_Instances.numInstances(); i++) {
if (m_Comparator.compare(
m_Instances.instance(i), result.instance(i)) != 0) {
equal = false;
break;
}
}
if (!equal) {
fail("Result should be equal");
}
}
public void testSubSample() {
m_Filter = getFilter();
((ReservoirSample)m_Filter).setSampleSize(10);
Instances result = useFilter();
assertEquals(result.numInstances(), 10);
// instances should be different from the first 10 instances in
// the original data
boolean equal = true;
for (int i = 0; i < result.numInstances(); i++) {
if (m_Comparator.compare(
m_Instances.instance(i), result.instance(i)) != 0) {
equal = false;
break;
}
}
if (equal) {
fail("Result should be different than the first 10 instances");
}
}
public void testHeaderOnlyInput() {
m_Filter = getFilter();
m_Instances = new Instances(m_Instances, 0);
Instances result = useFilter();
assertEquals(result.numInstances(), m_Instances.numInstances());
}
public static Test suite() {
return new TestSuite(ReservoirSampleTest.class);
}
public static void main(String[] args){
junit.textui.TestRunner.run(suite());
}
}