/*
* 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) 2005 University of Waikato, Hamilton, New Zealand
*/
package weka.filters.unsupervised.attribute;
import weka.core.Instances;
import weka.filters.AbstractFilterTest;
import weka.filters.Filter;
import junit.framework.Test;
import junit.framework.TestSuite;
/**
* Tests RandomSubset. Run from the command line with: <p/>
* java weka.filters.unsupervised.attribute.RandomSubsetTest
*
* @author FracPete (fracpete at waikato dot ac dot nz)
* @version $Revision: 1.1 $
*/
public class RandomSubsetTest
extends AbstractFilterTest {
/**
* Initializes the test.
*
* @param name the name of the test
*/
public RandomSubsetTest(String name) {
super(name);
}
/**
* Creates a default RandomSubset.
*
* @return the filter
*/
public Filter getFilter() {
return new RandomSubset();
}
/**
* Creates a specialized RandomSubset.
*
* @param num the number of attributes
* @return the filter
*/
public Filter getFilter(double num) {
RandomSubset result = new RandomSubset();
result.setNumAttributes(num);
return result;
}
/**
* performs the actual test.
*
* @param numSel the number of attributes to select
* @param numOut the number of attributes that are expected
*/
protected void performTest(double numSel, int numOut) {
m_Filter = getFilter(numSel);
Instances icopy = new Instances(m_Instances);
Instances result = null;
try {
m_Filter.setInputFormat(icopy);
}
catch (Exception ex) {
ex.printStackTrace();
fail("Exception thrown on setInputFormat(): \n" + ex.getMessage());
}
try {
result = Filter.useFilter(icopy, m_Filter);
assertNotNull(result);
}
catch (Exception ex) {
ex.printStackTrace();
fail("Exception thrown on useFilter(): \n" + ex.getMessage());
}
assertEquals(numOut, result.numAttributes());
assertEquals(icopy.numInstances(), m_Instances.numInstances());
}
/**
* Tests a percentage.
*/
public void testPercentage() {
performTest(0.5, 4);
}
/**
* Tests an absolute number.
*/
public void testAbsolute() {
performTest(5, 5);
}
/**
* Returns a test suite.
*
* @return the test suite
*/
public static Test suite() {
return new TestSuite(RandomSubsetTest.class);
}
/**
* Runs the test from commandline.
*
* @param args ignored
*/
public static void main(String[] args){
junit.textui.TestRunner.run(suite());
}
}