assertMapEquals(copy, "two", 2, "three", 3, "one", 1);
    assertSame(copy, ImmutableSortedMap.copyOf(copy, comparator));
    assertSame(comparator, copy.comparator());
  }

  public void testCopyOfSortedNatural() {
    SortedMap<String, Integer> original = Maps.newTreeMap();
    original.put("one", 1);
    original.put("two", 2);
    original.put("three", 3);