private void testSetSimple(LongSortedSet set) {
assertFalse(set.isEmpty());
assertEquals(3, set.size());
assertEquals(2, set.firstLong());
assertEquals(6, set.lastLong());
assertEquals(Long.valueOf(2), set.first());
assertEquals(Long.valueOf(6), set.last());
assertTrue(set.contains(2));
assertTrue(set.contains(5));
assertTrue(set.contains(6));
assertFalse(set.contains(0));
assertFalse(set.contains(42));
assertFalse(set.iterator().hasPrevious());
long[] items = LongIterators.unwrap(set.iterator());
assertEquals(2, items[0]);
assertEquals(5, items[1]);
assertEquals(6, items[2]);
}