001 /* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017 package org.apache.commons.math.genetics; 018 019 import static org.junit.Assert.*; 020 021 import org.junit.Test; 022 023 public class ElitisticListPopulationTest { 024 025 private static int counter = 0; 026 027 @Test 028 public void testNextGeneration() { 029 ElitisticListPopulation pop = new ElitisticListPopulation(100, 0.203); 030 031 for (int i=0; i<pop.getPopulationLimit(); i++) { 032 pop.addChromosome(new DummyChromosome()); 033 } 034 035 Population nextGeneration = pop.nextGeneration(); 036 037 assertEquals(20, nextGeneration.getPopulationSize()); 038 } 039 040 private static class DummyChromosome extends Chromosome { 041 private final int fitness; 042 043 public DummyChromosome() { 044 this.fitness = counter; 045 counter++; 046 } 047 048 public double fitness() { 049 return this.fitness; 050 } 051 } 052 053 }