/**
* 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.similarity.precompute;
import java.util.ArrayList;
import java.util.List;
import org.apache.mahout.cf.taste.impl.TasteTestCase;
import org.apache.mahout.cf.taste.impl.recommender.GenericRecommendedItem;
import org.apache.mahout.cf.taste.recommender.RecommendedItem;
import org.hamcrest.Matchers;
import org.junit.Test;
public class SimilarItemsTest extends TasteTestCase {
@Test
public void testIterator() {
List<RecommendedItem> recommendedItems = new ArrayList<>();
for (long itemId = 2; itemId < 10; itemId++) {
recommendedItems.add(new GenericRecommendedItem(itemId, itemId));
}
SimilarItems similarItems = new SimilarItems(1, recommendedItems);
assertThat(similarItems.getSimilarItems(), Matchers.<SimilarItem> iterableWithSize(recommendedItems.size()));
int byHandIndex = 0;
for (SimilarItem simItem : similarItems.getSimilarItems()) {
RecommendedItem recItem = recommendedItems.get(byHandIndex++);
assertEquals(simItem.getItemID(), recItem.getItemID());
assertEquals(simItem.getSimilarity(), recItem.getValue(), EPSILON);
}
}
}