SortedSet<String> set = of("in", "the", "a");
    assertFalse(set.equals(Sets.newTreeSet(asList(4, 5, 6))));
    assertNotEqualLenient(Sets.newTreeSet(asList(4, 5, 6)), set);
  }

  public void testContainsAll_notSortedSet() {
    SortedSet<String> set = of("a", "b", "f");
    assertTrue(set.containsAll(emptyList()));
    assertTrue(set.containsAll(asList("b")));
    assertTrue(set.containsAll(asList("b", "b")));