public abstract Comparator<Schedulable> getComparator();
@Test
  public void testFairShareComparatorTransitivity() {
    FairSharePolicy policy = new FairSharePolicy();
    Comparator<Schedulable> fairShareComparator = policy.getComparator();
    FairShareComparatorTester tester =
        new FairShareComparatorTester(fairShareComparator);
    tester.testTransitivity();
  }