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package jcgp.tests;
import static org.junit.Assert.*;
import java.util.Random;
import jcgp.Parameters;
import jcgp.Utilities;
import jcgp.function.Addition;
import jcgp.function.FunctionSet;
import jcgp.function.Subtraction;
import jcgp.population.Chromosome;
import jcgp.population.Population;
import org.junit.Before;
import org.junit.BeforeClass;
import org.junit.Test;
/**
*
* Tests which cover the behaviour specified for a population.
*
* - A population is a collection of chromosomes. It should be Iterable
* so the chromosomes can be accessed. Chromosomes should never be removed
* via the iterator.
* - When constructed with no arguments, it should generate populationSize
* random chromosomes.
* - If an array of chromosomes is passed as an argument to the constructor,
* it should use those chromosomes as the population.
*
*
* @author Eduardo Pedroni
*
*/
public class PopulationTests {
private Population population;
@BeforeClass
public static void setUpBeforeClass() throws Exception {
// initialise function set
FunctionSet functionSet = new FunctionSet(new Addition(), new Subtraction());
// initialise utilities
Utilities.setResources(new Random(1234), functionSet);
// initialise parameters
Parameters.setColumns(20);
Parameters.setRows(20);
Parameters.setInputs(2);
Parameters.setOutputs(4);
Parameters.setLevelsBack(1);
Parameters.setMutationRate(10);
Parameters.setTotalGenerations(100);
Parameters.setTotalRuns(5);
Parameters.setPopulationSize(5);
Parameters.setMaxArity(functionSet.getMaxArity());
}
@Before
public void setUp() throws Exception {
population = new Population();
}
@Test
public void iterableTest() {
// check that Population is really Iterable
assertTrue("Population must implement Iterable.", population instanceof Iterable);
// iterate through, check that different chromosomes are returned and no chromosome can be removed
Chromosome comparison = null;
int iterationCount = 0;
for (Chromosome chromosome : population) {
iterationCount++;
assertTrue("Same chromosome returned twice.", comparison != chromosome);
comparison = chromosome;
population.iterator().remove();
assertTrue("Chromosome removed.", comparison == chromosome);
}
// check that all chromosomes were iterated through
assertTrue("Not enough itearations occurred.", iterationCount == Parameters.getPopulationSize());
}
@Test
public void contentsTest() {
// check that the constructor really generates populationSize chromosomes when none is given
int populationCount = 0;
for (Chromosome chromosome : population) {
populationCount++;
}
assertTrue("Incorrect number of chromosomes generated.", populationCount == Parameters.getPopulationSize());
}
}
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