if (!mt.split(tok(random.nextInt(max))))
break;
}
// validate the tree
TreeRangeIterator ranges = mt.invalids();
for (TreeRange range : ranges)
range.addHash(new RowHash(range.right, new byte[0], 0));
assert mt.hash(new Range<>(tok(-1), tok(-1))) != null :
"Could not hash tree " + mt;