/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.mahout.cf.taste.impl.neighborhood;
import org.apache.mahout.cf.taste.impl.TasteTestCase;
import org.apache.mahout.cf.taste.model.DataModel;
import org.junit.Test;
/** <p>Tests {@link NearestNUserNeighborhood}.</p> */
public final class NearestNNeighborhoodTest extends TasteTestCase {
@Test
public void testNeighborhood() throws Exception {
DataModel dataModel = getDataModel();
long[] neighborhood =
new NearestNUserNeighborhood(1, new DummySimilarity(dataModel), dataModel).getUserNeighborhood(1);
assertNotNull(neighborhood);
assertEquals(1, neighborhood.length);
assertTrue(arrayContains(neighborhood, 2));
long[] neighborhood2 =
new NearestNUserNeighborhood(2, new DummySimilarity(dataModel), dataModel).getUserNeighborhood(2);
assertNotNull(neighborhood2);
assertEquals(2, neighborhood2.length);
assertTrue(arrayContains(neighborhood2, 1));
assertTrue(arrayContains(neighborhood2, 3));
long[] neighborhood3 =
new NearestNUserNeighborhood(4, new DummySimilarity(dataModel), dataModel).getUserNeighborhood(4);
assertNotNull(neighborhood3);
assertEquals(3, neighborhood3.length);
assertTrue(arrayContains(neighborhood3, 1));
assertTrue(arrayContains(neighborhood3, 2));
assertTrue(arrayContains(neighborhood3, 3));
}
}