### Question:
GeneticConfiguration implements Comparable<GeneticConfiguration> { public void mutate() { Aspect aspect = aspects.get((int) (Math.random() * aspects.size())); aspect.setRandomly(this); } GeneticConfiguration(Configuration config);  GeneticConfiguration(Configuration config, int mutation_rate,
                              double recombination_rate,
                              boolean evolve_comparators);  GeneticConfiguration(GeneticConfiguration config); Configuration getConfiguration(); int getRank(); void setRank(int rank); double getFNumber(); void setFNumber(double f); GeneticConfiguration getParent(); GeneticConfiguration makeRandomCopy(); GeneticConfiguration makeCopy(); int getMutationRate(); void setMutationRate(int mutation_rate); double getRecombinationRate(); void mutate(); void mateWith(GeneticConfiguration other); int compareTo(GeneticConfiguration other); String toString();  }### Answer:
@Test public void testMutate() { GeneticConfiguration conf = new GeneticConfiguration(config1.copy()); conf.mutate(); Configuration rand = conf.getConfiguration(); int diffs = countDifferences(config1, rand); if (diffs == 0) { conf.mutate(); diffs = countDifferences(config1, rand); if (diffs == 0) { conf.mutate(); diffs = countDifferences(config1, rand); } } assertEquals("wrong number of differences", 1, diffs); }