assertThat(multimap.get("a")).containsExactly(5, 2).inOrder();
    assertThat(multimap.get("b")).containsExactly(3, 6).inOrder();
  }

  public void testBuilderOrderKeysByDuplicates() {
    ImmutableListMultimap.Builder<String, Integer> builder = ImmutableListMultimap.builder();
    builder.put("bb", 3);
    builder.put("d", 2);
    builder.put("a", 5);
    builder.orderKeysBy(