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//=============================================================================
// Copyright 2006-2010 Daniel W. Dyer
//
// Licensed 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.uncommons.watchmaker.framework.operators;
import java.util.Arrays;
import java.util.List;
import java.util.Random;
import org.testng.annotations.Test;
import org.uncommons.maths.random.Probability;
import org.uncommons.watchmaker.framework.FrameworkTestUtils;
import org.uncommons.watchmaker.framework.factories.AbstractCandidateFactory;
/**
* Unit test for the {@link Replacement} evolutionary operator.
* @author Daniel Dyer
*/
public class ReplacementTest
{
@Test
public void testReplacement()
{
IntegerFactory factory = new IntegerFactory();
List<Integer> candidates = Arrays.asList(10, 11, 12);
Replacement<Integer> replacement = new Replacement<Integer>(factory,
Probability.ONE);
// Numbers will be replaced with lower ones.
List<Integer> output = replacement.apply(candidates, FrameworkTestUtils.getRNG());
assert output.size() == candidates.size() : "Candidate list should be same size.";
assert !output.contains(10) : "Candidate should have been replaced.";
assert !output.contains(11) : "Candidate should have been replaced.";
assert !output.contains(12) : "Candidate should have been replaced.";
}
@Test
public void testZeroProbability()
{
IntegerFactory factory = new IntegerFactory();
List<Integer> candidates = Arrays.asList(10, 11, 12);
Replacement<Integer> replacement = new Replacement<Integer>(factory,
Probability.ZERO);
// Numbers will be replaced with lower ones.
List<Integer> output = replacement.apply(candidates, FrameworkTestUtils.getRNG());
assert output.size() == candidates.size() : "Candidate list should be same size.";
assert output.contains(10) : "Candidate should not have been replaced.";
assert output.contains(11) : "Candidate should not have been replaced.";
assert output.contains(12) : "Candidate should not have been replaced.";
}
/**
* Non-random factory, for test purposes.
*/
protected static final class IntegerFactory extends AbstractCandidateFactory<Integer>
{
private int count = 0;
public Integer generateRandomCandidate(Random rng)
{
return ++count;
}
}
}
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