/*
 * 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.math.genetics;

import static org.junit.Assert.*;

import org.junit.Test;

public class ElitisticListPopulationTest {

	private static int counter = 0;

	@Test
	public void testNextGeneration() {
		ElitisticListPopulation pop = new ElitisticListPopulation(100, 0.203);

		for (int i = 0; i < pop.getPopulationLimit(); i++) {
			pop.addChromosome(new DummyChromosome());
		}

		Population nextGeneration = pop.nextGeneration();

		assertEquals(20, nextGeneration.getPopulationSize());
	}

	private static class DummyChromosome extends Chromosome {
		private final int fitness;

		public DummyChromosome() {
			this.fitness = counter;
			counter++;
		}

		public double fitness() {
			return this.fitness;
		}
	}

}
