def test_dna_crossover(self):
dna1 = DNA("asdfghjkl")
dna2 = DNA("qwertyuio")
crossover_points = 2
child1 = dna1.crossover(dna2, crossover_points)
child2 = dna2.crossover(dna1, crossover_points)
self.assertNotEqual(child1, child2)
self.assertEqual(len(child1.structure), len(child2.structure))
