for (int i = 0; i < RevTree.NORMALIZED_SIZE_LIMIT; i++) {
builder.remove(String.valueOf(i));
}
changed = builder.build();
assertEquals(RevTree.NORMALIZED_SIZE_LIMIT, changed.size());
assertFalse(changed.buckets().isPresent());
assertEquals(RevTree.NORMALIZED_SIZE_LIMIT, count(bucketsFeatureTree, changed)
.featureCount());
assertEquals(RevTree.NORMALIZED_SIZE_LIMIT, count(changed, bucketsFeatureTree)
.featureCount());