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package jcgp.backend.tests;
import static org.junit.Assert.assertTrue;
import jcgp.backend.population.Chromosome;
import jcgp.backend.population.Population;
import jcgp.backend.resources.Resources;
import org.junit.Before;
import org.junit.BeforeClass;
import org.junit.Test;
/**
*
* Tests which cover the behaviour specified for a population.
*
* - It should be possible to iterate through all the chromosomes in a population.
* - When constructed with no arguments, it should generate populationSize
* random chromosomes, distributed according to the EA parameters.
* - If one or more chromosomes are passed into the constructor, it should use them
* as parents to create the rest of the population.
*
*
* @author Eduardo Pedroni
*
*/
public class PopulationTests {
private Population population;
private static Resources resources;
@BeforeClass
public static void setUpBeforeClass() throws Exception {
resources = new Resources();
// // initialise function set
// FunctionSet functionSet = new FunctionSet(new Arithmetic.Addition(), new Arithmetic.Subtraction());
//
// // initialise utilities
// Utilities.setResources(new Random(1234), functionSet);
//
// // initialise parameters
// Resources.setColumns(20);
// Resources.setRows(20);
// Resources.setInputs(2);
// Resources.setOutputs(4);
// Resources.setLevelsBack(1);
// Resources.setMutationRate(10);
// Resources.setTotalGenerations(100);
// Resources.setTotalRuns(5);
// Resources.setPopulationSize(1, 4);
// Resources.setMaxArity(functionSet.getMaxArity());
}
@Before
public void setUp() throws Exception {
population = new Population(resources);
}
@Test
public void defaultPopulationTest() {
// check that the constructor really generates populationSize chromosomes when none is given
int chromosomes = 0;
while (true) {
try {
population.getChromosome(chromosomes);
} catch (IndexOutOfBoundsException e) {
break;
}
chromosomes++;
}
assertTrue("Incorrect number of chromosomes generated.", chromosomes == resources.getInt("popSize"));
}
@Test
public void preinitialisedChromosomeTest() {
// the original chromosome that will be cloned
Chromosome oc = new Chromosome(resources);
// initialise a population with a copy of it
population = new Population(oc, resources);
// check that the first parent chromosome is identical to, but not the same instance as, the one given
assertTrue("Incorrect chromosome in population.", population.getChromosome(0).compareTo(oc) && population.getChromosome(0) != oc);
}
}
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