@Test
 public void testAfter() throws Exception {
   Iterable<StorageKey> partitions =
       new FileSystemPartitionIterator(
           fileSystem,
           testDirectory,
           strategy,
           schema,
           emptyConstraints.fromAfter("timestamp", oct_24_2013_end).toKeyPredicate());
   assertIterableEquals(keys.subList(17, 24), partitions);
 }