expected =
        assertThrows(IllegalArgumentException.class, () -> range.intersection(Range.closed(0, 2)));
    assertThat(expected).hasMessageThat().contains("connected");
  }

  public void testIntersection_deFactoEmpty() {
    {
      Range<Integer> range = Range.open(3, 4);
      assertEquals(range, range.intersection(range));

      assertEquals(Range.openClosed(3, 3), range.intersection(Range.atMost(3)));