OnePointCrossoverTest.java

/*
 * Copyright 2015 S. Webber
 *
 * 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.oakgp.evolve.crossover;

import static org.oakgp.TestUtils.assertNodeEquals;
import static org.oakgp.util.DummyRandom.GetIntExpectation.nextInt;

import org.junit.Test;
import org.oakgp.evolve.GeneticOperator;
import org.oakgp.node.Node;
import org.oakgp.select.DummyNodeSelector;
import org.oakgp.util.DummyRandom;

public class OnePointCrossoverTest {
   @Test
   public void testFunctionNodes() {
      DummyRandom dummyRandom = nextInt(4).returns(0, 1, 2, 3);
      DummyNodeSelector dummySelector = DummyNodeSelector.repeat(4, "(if true 5 (+ 1 (- 2 3)))", "(if false 7 (- 8 v5))");

      GeneticOperator c = new OnePointCrossover(dummyRandom);

      assertNodeEquals("(if false 5 (+ 1 (- 2 3)))", c.evolve(dummySelector));
      assertNodeEquals("(if true 7 (+ 1 (- 2 3)))", c.evolve(dummySelector));
      assertNodeEquals("(if true 5 (+ 8 (- 2 3)))", c.evolve(dummySelector));
      assertNodeEquals("(if true 5 (- 8 v5))", c.evolve(dummySelector));

      dummyRandom.assertEmpty();
      dummySelector.assertEmpty();
   }

   @Test
   public void testConstantNode() {
      DummyNodeSelector dummySelector = new DummyNodeSelector("7", "(* 7 (- 8 v5))");

      GeneticOperator c = new OnePointCrossover(DummyRandom.EMPTY);

      Node result = c.evolve(dummySelector);
      assertNodeEquals("(* 7 (- 8 v5))", result);

      dummySelector.assertEmpty();
   }
}