/*
* 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.hadoop.item;
import org.apache.hadoop.mapreduce.Counter;
import org.apache.hadoop.mapreduce.Reducer;
import org.apache.mahout.cf.taste.hadoop.TasteHadoopUtils;
import org.apache.mahout.cf.taste.impl.TasteTestCase;
import org.apache.mahout.math.VarLongWritable;
import org.apache.mahout.math.VectorWritable;
import org.apache.mahout.math.hadoop.MathHelper;
import org.easymock.EasyMock;
import org.junit.Test;
import java.util.Arrays;
import java.util.Collections;
/**
* tests {@link ToUserVectorsReducer}
*/
public class ToUserVectorsReducerTest extends TasteTestCase {
@Test
public void testToUsersReducerMinPreferencesUserIgnored() throws Exception {
Reducer<VarLongWritable,VarLongWritable,VarLongWritable,VectorWritable>.Context context =
EasyMock.createMock(Reducer.Context.class);
ToUserVectorsReducer reducer = new ToUserVectorsReducer();
setField(reducer, "minPreferences", 2);
EasyMock.replay(context);
reducer.reduce(new VarLongWritable(123), Collections.singletonList(new VarLongWritable(456)), context);
EasyMock.verify(context);
}
@Test
public void testToUsersReducerMinPreferencesUserPasses() throws Exception {
Reducer<VarLongWritable,VarLongWritable,VarLongWritable,VectorWritable>.Context context =
EasyMock.createMock(Reducer.Context.class);
Counter userCounters = EasyMock.createMock(Counter.class);
ToUserVectorsReducer reducer = new ToUserVectorsReducer();
setField(reducer, "minPreferences", 2);
EasyMock.expect(context.getCounter(ToUserVectorsReducer.Counters.USERS)).andReturn(userCounters);
userCounters.increment(1);
context.write(EasyMock.eq(new VarLongWritable(123)), MathHelper.vectorMatches(
MathHelper.elem(TasteHadoopUtils.idToIndex(456L), 1.0), MathHelper.elem(TasteHadoopUtils.idToIndex(789L), 1.0)));
EasyMock.replay(context, userCounters);
reducer.reduce(new VarLongWritable(123), Arrays.asList(new VarLongWritable(456), new VarLongWritable(789)), context);
EasyMock.verify(context, userCounters);
}
}