assertEquals(
        ImmutableSet.of(),
        ContiguousSet.create(Range.closed(-5, -1), integers())
            .intersection(ContiguousSet.create(Range.open(3, 64), integers())));
  }

  public void testIntersection() {
    ContiguousSet<Integer> set = ContiguousSet.create(Range.closed(1, 3), integers());
    assertEquals(
        ImmutableSet.of(1, 2, 3),

            .add(Range.openClosed(15, 17))
            .add(Range.open(19, 20))
            .build();

    assertThat(RANGE_SET_ONE.union(RANGE_SET_TWO)).isEqualTo(expected);
  }

  public void testIntersection() {
    RangeSet<Integer> expected =
        ImmutableRangeSet.<Integer>builder()
            .add(Range.closed(2, 3))
            .add(Range.open(6, 7))
            .add(Range.singleton(8))

    assertEquals(
        ImmutableSet.of(),
        ContiguousSet.create(Range.closed(-5, -1), integers())
            .intersection(ContiguousSet.create(Range.open(3, 64), integers())));
  }

  public void testIntersection() {
    ContiguousSet<Integer> set = ContiguousSet.create(Range.closed(1, 3), integers());
    assertEquals(
        ImmutableSet.of(1, 2, 3),