/**
* 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.ga.watchmaker.cd.hadoop;
import junit.framework.TestCase;
import org.apache.hadoop.io.LongWritable;
import org.apache.mahout.ga.watchmaker.cd.CDFitness;
import org.apache.mahout.common.DummyOutputCollector;
import org.apache.mahout.common.RandomUtils;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;
import java.util.Set;
public class CDReducerTest extends TestCase {
private static final int nbevals = 100;
private List<CDFitness> evaluations;
private CDFitness expected;
@Override
protected void setUp() {
// generate random evaluatons and calculate expectations
evaluations = new ArrayList<CDFitness>();
RandomUtils.useTestSeed();
Random rng = RandomUtils.getRandom();
int tp = 0;
int fp = 0;
int tn = 0;
int fn = 0;
for (int index = 0; index < nbevals; index++) {
CDFitness fitness = new CDFitness(rng.nextInt(100), rng.nextInt(100), rng
.nextInt(100), rng.nextInt(100));
tp += fitness.getTp();
fp += fitness.getFp();
tn += fitness.getTn();
fn += fitness.getFn();
evaluations.add(fitness);
}
expected = new CDFitness(tp, fp, tn, fn);
}
public void testReduce() throws IOException {
CDReducer reducer = new CDReducer();
DummyOutputCollector<LongWritable, CDFitness> collector = new DummyOutputCollector<LongWritable, CDFitness>();
LongWritable zero = new LongWritable(0);
reducer.reduce(zero, evaluations.iterator(), collector, null);
// check if the expectations are met
Set<String> keys = collector.getKeys();
assertEquals("nb keys", 1, keys.size());
assertTrue("bad key", keys.contains(zero.toString()));
assertEquals("nb values", 1, collector.getValue(zero.toString()).size());
CDFitness fitness = collector.getValue(zero.toString()).get(0);
assertEquals(expected, fitness);
}
}