expectedRangesByUpperBound.put(range.upperBound, range);
        }
        testNavigationAgainstExpected(
            expectedRangesByUpperBound,
            new TreeRangeSet.RangesByUpperBound<Integer>(rangeSet.rangesByLowerBound),
            CUTS_TO_TEST);
      }
    }
  }

  public void testMergesConnectedWithOverlap() {
    TreeRangeSet<Integer> rangeSet = TreeRangeSet.create();