assertThat(ImmutableSortedMap.copyOfSorted(copy)).isSameInstanceAs(copy);
    assertThat(copy.comparator()).isEqualTo(Ordering.natural());
  }

  public void testCopyOfSortedExplicit() {
    Comparator<String> comparator = Ordering.<String>natural().reverse();
    SortedMap<String, Integer> original = Maps.newTreeMap(comparator);
    original.put("one", 1);
    original.put("two", 2);