SortedSet<String> set = of("e");
    SortedSet<String> copy = SerializableTester.reserializeAndAssert(set);
    assertEquals(set.comparator(), copy.comparator());
  }

  public void testOf_ordering() {
    SortedSet<String> set = of("e", "a", "f", "b", "d", "c");
    assertThat(set).containsExactly("a", "b", "c", "d", "e", "f").inOrder();
  }

  /*