assertEquals(
        Range.closedOpen(1, 4),
        ContiguousSet.create(Range.closedOpen(1, 4), integers()).range(CLOSED, OPEN));
    assertEquals(
        Range.closedOpen(1, 4),
        ContiguousSet.create(Range.open(0, 4), integers()).range(CLOSED, OPEN));
    assertEquals(
        Range.closedOpen(1, 4),
        ContiguousSet.create(Range.openClosed(0, 3), integers()).range(CLOSED, OPEN));
  }

    assertEquals(Range.closedOpen(1, 5), Range.closed(1, 4).canonical(integers()));
    assertEquals(Range.closedOpen(1, 5), Range.open(0, 5).canonical(integers()));
    assertEquals(Range.closedOpen(1, 5), Range.closedOpen(1, 5).canonical(integers()));
    assertEquals(Range.closedOpen(1, 5), Range.openClosed(0, 4).canonical(integers()));

    assertEquals(
        Range.closedOpen(Integer.MIN_VALUE, 0),

    assertEquals(
        Range.closedOpen(1, 4),
        ContiguousSet.create(Range.closedOpen(1, 4), integers()).range(CLOSED, OPEN));
    assertEquals(
        Range.closedOpen(1, 4),
        ContiguousSet.create(Range.open(0, 4), integers()).range(CLOSED, OPEN));
    assertEquals(
        Range.closedOpen(1, 4),
        ContiguousSet.create(Range.openClosed(0, 3), integers()).range(CLOSED, OPEN));
  }

    assertEquals(Range.closedOpen(1, 5), Range.closed(1, 4).canonical(integers()));
    assertEquals(Range.closedOpen(1, 5), Range.open(0, 5).canonical(integers()));
    assertEquals(Range.closedOpen(1, 5), Range.closedOpen(1, 5).canonical(integers()));
    assertEquals(Range.closedOpen(1, 5), Range.openClosed(0, 4).canonical(integers()));

    assertEquals(
        Range.closedOpen(Integer.MIN_VALUE, 0),

    rangeMap.put(Range.closedOpen(7, 10), 2);
    rangeMap.put(Range.closedOpen(12, 15), 2);
    rangeMap.put(Range.closedOpen(18, 19), 3);

    rangeMap.putCoalescing(Range.closedOpen(-5, -4), 0); // disconnected
    rangeMap.putCoalescing(Range.closedOpen(-6, -5), 0); // lower than minimum

    rangeMap.putCoalescing(Range.closedOpen(2, 4), 1); // between

    ImmutableRangeSet<Integer> rangeSet = ImmutableRangeSet.of(Range.closedOpen(1, 5));

    assertThat(rangeSet.asRanges()).contains(Range.closedOpen(1, 5));

    assertTrue(rangeSet.intersects(Range.closed(3, 4)));
    assertTrue(rangeSet.intersects(Range.closedOpen(0, 2)));
    assertTrue(rangeSet.intersects(Range.closedOpen(3, 7)));
    assertTrue(rangeSet.intersects(Range.greaterThan(2)));

    for (int i = MIN_BOUND; i <= MAX_BOUND; i++) {
      int ii = i;
      ImmutableRangeMap.Builder<Integer, Integer> builder = ImmutableRangeMap.builder();
      assertThrows(IllegalArgumentException.class, () -> builder.put(Range.closedOpen(ii, ii), 1));
      assertThrows(IllegalArgumentException.class, () -> builder.put(Range.openClosed(ii, ii), 1));
    }
  }

  public void testOverlapRejection() {
    for (Range<Integer> range1 : RANGES) {

    assertEquals(set, Sets.subSet(set, Range.closedOpen(0, 12)));
    assertEquals(ImmutableSortedSet.of(2), Sets.subSet(set, Range.closedOpen(0, 4)));
    assertEquals(ImmutableSortedSet.of(2, 4), Sets.subSet(set, Range.closedOpen(2, 6)));
    assertEquals(ImmutableSortedSet.of(4, 6), Sets.subSet(set, Range.closedOpen(3, 7)));
    assertEquals(empty, Sets.subSet(set, Range.closedOpen(20, 30)));
  }

 *
 * {@snippet :
 * RangeSet<Integer> rangeSet = TreeRangeSet.create();
 * rangeSet.add(Range.closed(1, 10)); // {[1, 10]}
 * rangeSet.add(Range.closedOpen(11, 15)); // disconnected range; {[1, 10], [11, 15)}
 * rangeSet.add(Range.closedOpen(15, 20)); // connected range; {[1, 10], [11, 20)}
 * rangeSet.add(Range.openClosed(0, 0)); // empty range; {[1, 10], [11, 20)}

       */
      for (int i = 0; i < elements.size() - 1; i++) {
        assertEquals(elements.get(i) + 1, (int) elements.get(i + 1));
      }
      Range<Integer> range =
          elements.isEmpty() ? Range.closedOpen(0, 0) : Range.encloseAll(elements);
      return ContiguousSet.create(range, DiscreteDomain.integers());
    }
  }

  /**
   * Useless constructor for a class of static utility methods.
   *