/*
* 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) 2009 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 RemoveByName. Run from the command line with: <p/>
* java weka.filters.unsupervised.attribute.RemoveByNameTest
*
* @author FracPete (fracpete at waikato dot ac dot nz)
* @version $Revision$
*/
public class RemoveByNameTest
extends AbstractFilterTest {
/**
* Initializes the test.
*
* @param name the name of the test
*/
public RemoveByNameTest(String name) {
super(name);
}
/**
* Creates a default RemoveByName.
*
* @return the filter
*/
public Filter getFilter() {
return getFilter(RemoveByName.DEFAULT_EXPRESSION, false);
}
/**
* returns a custom filter.
*
* @param expression the expression to use
* @param invert whether to invert the matching sense
* @return the configured filter
*/
protected Filter getFilter(String expression, boolean invert) {
RemoveByName filter;
filter = new RemoveByName();
filter.setExpression(expression);
filter.setInvertSelection(invert);
return filter;
}
/**
* Tests removing all attributes starting with "String".
*/
public void testTypical() {
Instances result;
m_Filter = getFilter("^String.*", false);
// 1. with class attribute
result = useFilter();
// Number of attributes will be two less, number of instances won't change
assertEquals(m_Instances.numAttributes() - 2, result.numAttributes());
assertEquals(m_Instances.numInstances(), result.numInstances());
}
/**
* Tests removing all attributes starting with "Nominal", one of them being
* the class attribute.
*/
public void testTypicalWithClass() {
Instances result;
m_Instances.setClassIndex(1); // "NominalAtt1"
m_Filter = getFilter("^Nominal.*", false);
// 1. with class attribute
result = useFilter();
// Number of attributes will be two less, number of instances won't change
assertEquals(m_Instances.numAttributes() - 1, result.numAttributes());
assertEquals(m_Instances.numInstances(), result.numInstances());
}
/**
* Tests removing all attributes but attributes ending with "Att2".
*/
public void testTypicalInverted() {
Instances result;
m_Filter = getFilter(".*Att2$", true);
// 1. with class attribute
result = useFilter();
// Number of attributes will be two less, number of instances won't change
assertEquals(3, result.numAttributes());
assertEquals(m_Instances.numInstances(), result.numInstances());
}
/**
* Returns a test suite.
*
* @return the test suite
*/
public static Test suite() {
return new TestSuite(RemoveByNameTest.class);
}
/**
* Runs the test from commandline.
*
* @param args ignored
*/
public static void main(String[] args){
junit.textui.TestRunner.run(suite());
}
}