ImmutableSortedSet.of(LegacyComparable.Z, LegacyComparable.Y);
    assertThat(set2).containsExactly(LegacyComparable.Y, LegacyComparable.Z);
  }

  public void testLegacyComparable_copyOf_collection() {
    ImmutableSortedSet<LegacyComparable> set =
        ImmutableSortedSet.copyOf(LegacyComparable.VALUES_BACKWARD);
    assertTrue(elementsEqual(LegacyComparable.VALUES_FORWARD, set));
  }