RangeMap<K, V> subRangeMap(Range<K> range);

  /**
   * Returns {@code true} if {@code obj} is another {@code RangeMap} that has an equivalent {@link
   * #asMapOfRanges()}.
   */
  @Override
  boolean equals(@Nullable Object o);

  /** Returns {@code asMapOfRanges().hashCode()}. */
  @Override
  int hashCode();

  /** Returns a readable string representation of this range map. */
  @Override
  String toString();

          ImmutableMap<Range<Integer>, Integer> expectedAsMap =
              ImmutableMap.of(range1, 1, range2, 2);
          ImmutableMap<Range<Integer>, Integer> asMap = rangeMap.asMapOfRanges();
          ImmutableMap<Range<Integer>, Integer> descendingMap = rangeMap.asDescendingMapOfRanges();
          assertEquals(expectedAsMap, asMap);
          assertEquals(expectedAsMap, descendingMap);