| /* |
| * 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.commons.math4.legacy.genetics; |
| |
| import org.junit.Assert; |
| import org.junit.Test; |
| |
| public class TournamentSelectionTest { |
| |
| private static int counter = 0; |
| |
| @Test |
| public void testSelect() { |
| TournamentSelection ts = new TournamentSelection(2); |
| ElitisticListPopulation pop = new ElitisticListPopulation(100, 0.203); |
| |
| for (int i=0; i<pop.getPopulationLimit(); i++) { |
| pop.addChromosome(new DummyChromosome()); |
| } |
| // how to write a test for stochastic method? |
| for (int i=0; i<20; i++) { |
| ChromosomePair pair = ts.select(pop); |
| // the worst chromosome should NEVER be selected |
| Assert.assertTrue(pair.getFirst().getFitness() > 0); |
| Assert.assertTrue(pair.getSecond().getFitness() > 0); |
| } |
| } |
| |
| private static class DummyChromosome extends Chromosome { |
| private final int fitness; |
| |
| DummyChromosome() { |
| this.fitness = counter; |
| counter++; |
| } |
| |
| @Override |
| public double fitness() { |
| return this.fitness; |
| } |
| } |
| |
| } |