/*
* LensKit, an open source recommender systems toolkit.
* Copyright 2010-2014 LensKit Contributors. See CONTRIBUTORS.md.
* Work on LensKit has been funded by the National Science Foundation under
* grants IIS 05-34939, 08-08692, 08-12148, and 10-17697.
*
* This program 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 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., 51
* Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
package org.grouplens.lenskit.data.pref;
import org.grouplens.lenskit.vectors.SparseVector;
import org.junit.Test;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import static org.hamcrest.Matchers.equalTo;
import static org.junit.Assert.assertThat;
/**
* @author <a href="http://www.grouplens.org">GroupLens Research</a>
*/
public class PreferencesTest {
@Test
public void testEmptyUPV() {
SparseVector v = Preferences.userPreferenceVector(Collections.<Preference>emptyList());
assertThat(v.isEmpty(), equalTo(true));
}
@Test
public void testUPVSomePrefs() {
List<Preference> prefs = new ArrayList<Preference>();
prefs.add(new SimplePreference(1, 3, 2.5));
prefs.add(new SimplePreference(1, 9, 4.0));
prefs.add(new SimplePreference(1, 5, 2.8));
SparseVector v = Preferences.userPreferenceVector(prefs);
assertThat(v.size(), equalTo(3));
assertThat(v.get(3), equalTo(2.5));
assertThat(v.get(9), equalTo(4.0));
assertThat(v.get(5), equalTo(2.8));
}
@Test(expected = IllegalArgumentException.class)
public void testUPVBadItems() {
List<Preference> prefs = new ArrayList<Preference>();
prefs.add(new SimplePreference(1, 3, 2.5));
prefs.add(new SimplePreference(1, 9, 4.0));
prefs.add(new SimplePreference(1, 5, 2.8));
prefs.add(new SimplePreference(1, 9, Math.PI));
@SuppressWarnings("unused")
SparseVector v = Preferences.userPreferenceVector(prefs);
}
@Test(expected = IllegalArgumentException.class)
public void testUPVBadUser() {
List<Preference> prefs = new ArrayList<Preference>();
prefs.add(new SimplePreference(1, 3, 2.5));
prefs.add(new SimplePreference(1, 9, 4.0));
prefs.add(new SimplePreference(2, 5, 2.8));
@SuppressWarnings("unused")
SparseVector v = Preferences.userPreferenceVector(prefs);
}
}