@Test
 public void toSet() {
   Interval interval = Interval.evensFromTo(0, 10);
   MutableSet<Integer> set = interval.toSet();
   Verify.assertContainsAll(set, 0, 2, 4, 6, 8, 10);
   Verify.assertSize(6, set);
 }
 @Test
 public void intervalToSet() {
   MutableSet<Integer> set = Interval.toSet(1, 5);
   Verify.assertSize(5, set);
   Verify.assertContainsAll(set, 1, 2, 3, 4, 5);
 }