set.add(new LegacyComparable("bar"));
    assertThat(set)
        .containsExactly(new LegacyComparable("bar"), new LegacyComparable("foo"))
        .inOrder();
  }

  public void testNewTreeSetFromCollection() {
    TreeSet<Integer> set = Sets.newTreeSet(SOME_COLLECTION);
    verifySortedSetContents(set, SOME_COLLECTION, null);
  }

  public void testNewTreeSetFromIterable() {