def test_offspring_returns_two_chromosomes_combining_parents():
parents = [Chromosome.random(), Chromosome.random()]
subject = Crossover(parents)
result = subject.offspring()
assert len(result) == 2
assert isinstance(result[0], Chromosome)
assert isinstance(result[1], Chromosome)
def test_offspring_returns_chromosomes_combining_parents(monkeypatch):
parents = [
Chromosome(np.array(list("XXXXXXXXXXXXXXXXXXXXXXXXXX"))),
Chromosome(np.array(list("YYYYYYYYYYYYYYYYYYYYYYYYYY"))),
]
subject = Crossover(parents)
monkeypatch.setattr(subject, "pivot", 3)
result = subject.offspring()
assert result[0] == Chromosome(np.array(
list("XXXYYYYYYYYYYYYYYYYYYYYYYY")))
assert result[1] == Chromosome(np.array(
list("YYYXXXXXXXXXXXXXXXXXXXXXXX")))
def test_call_returns_crossed_over_if_must_crossover(monkeypatch):
parents = [Chromosome.random(), Chromosome.random()]
subject = Crossover(parents)
monkeypatch.setattr(subject, "will_crossover_happen", lambda: True)
assert subject() == subject.offspring()