@Test
public void mutateInvalidGene() {

	final var mutator = new GaussianMutator<DoubleGene, Double>() {
		public DoubleGene mutate(final DoubleGene gene, final Random random) {
			return super.mutate(gene, random);
		}
	};
	final DoubleGene gene = DoubleGene.of(0.9, 5, 1);
	Assert.assertFalse(gene.isValid());
	final DoubleGene gene1 = mutator.mutate(gene, new Random());
	Assert.assertSame(gene1, gene);
}