public void RankSelectionOperator_SelectEntitiesFromPopulation_NullPopulation()
{
RankSelectionOperator op = new RankSelectionOperator();
PrivateObject accessor = new PrivateObject(op);
Assert.Throws <ArgumentNullException>(() => accessor.Invoke("SelectEntitiesFromPopulation", (int)0, (Population)null));
}
public void RankSelectionOperator_Select()
{
GeneticAlgorithm algorithm = GetAlgorithm();
RankSelectionOperator op = new RankSelectionOperator();
op.Initialize(algorithm);
SimplePopulation population = new SimplePopulation();
population.Initialize(algorithm);
MockEntity entity1 = new MockEntity();
entity1.Initialize(algorithm);
MockEntity entity2 = new MockEntity();
entity2.Initialize(algorithm);
MockEntity entity3 = new MockEntity();
entity3.Initialize(algorithm);
MockEntity entity4 = new MockEntity();
entity4.Initialize(algorithm);
entity1.ScaledFitnessValue = 0;
entity2.ScaledFitnessValue = 50;
entity3.ScaledFitnessValue = 23;
entity4.ScaledFitnessValue = 25;
population.Entities.Add(entity1);
population.Entities.Add(entity2);
population.Entities.Add(entity3);
population.Entities.Add(entity4);
TestRandomUtil randomUtil = new TestRandomUtil();
RandomNumberService.Instance = randomUtil;
randomUtil.Ratio = 0;
IList <GeneticEntity> selectedEntities = op.SelectEntities(1, population).ToList();
Assert.Same(entity1, selectedEntities[0]);
randomUtil.Ratio = .099999;
selectedEntities = op.SelectEntities(1, population);
Assert.Same(entity1, selectedEntities[0]);
randomUtil.Ratio = .1;
selectedEntities = op.SelectEntities(1, population);
Assert.Same(entity3, selectedEntities[0]);
randomUtil.Ratio = .299999;
selectedEntities = op.SelectEntities(1, population);
Assert.Same(entity3, selectedEntities[0]);
randomUtil.Ratio = .3;
selectedEntities = op.SelectEntities(1, population);
Assert.Same(entity4, selectedEntities[0]);
randomUtil.Ratio = .599999;
selectedEntities = op.SelectEntities(1, population);
Assert.Same(entity4, selectedEntities[0]);
randomUtil.Ratio = .6;
selectedEntities = op.SelectEntities(1, population);
Assert.Same(entity2, selectedEntities[0]);
randomUtil.Ratio = 1;
selectedEntities = op.SelectEntities(1, population);
Assert.Same(entity2, selectedEntities[0]);
}
