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 BinaryMutationTest {
024    
025        @Test
026        public void testMutate() {
027            BinaryMutation mutation = new BinaryMutation();
028            
029            // stochastic testing :)
030            for (int i=0; i<20; i++) {
031                DummyBinaryChromosome original = new DummyBinaryChromosome(BinaryChromosome.randomBinaryRepresentation(10));            
032                DummyBinaryChromosome mutated = (DummyBinaryChromosome) mutation.mutate(original);
033                
034                // one gene should be different
035                int numDifferent = 0;
036                for (int j=0; j<original.getRepresentation().size(); j++) {
037                    if (original.getRepresentation().get(j) != mutated.getRepresentation().get(j))
038                        numDifferent++;
039                }
040                assertEquals(1, numDifferent);
041            }
042        }
043    
044    }