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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.apache.org/licenses/LICENSE-2.0
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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package org.apache.commons.math.genetics;
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import static org.junit.Assert.*;
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import org.junit.Test;
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public class TournamentSelectionTest {
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private static int counter = 0;
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public void testSelect() {
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TournamentSelection ts = new TournamentSelection(2);
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ElitisticListPopulation pop = new ElitisticListPopulation(100, 0.203);
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for (int i=0; i<pop.getPopulationLimit(); i++) {
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pop.addChromosome(new DummyChromosome());
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// how to write a test for stochastic method?
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for (int i=0; i<20; i++) {
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ChromosomePair pair = ts.select(pop);
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// the worst chromosome should NEVER be selected
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assertTrue(pair.getFirst().getFitness() > 0);
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assertTrue(pair.getSecond().getFitness() > 0);
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private static class DummyChromosome extends Chromosome {
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private final int fitness;
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public DummyChromosome() {
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this.fitness = counter;
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public double fitness() {