// test the collector w/ FacetRequests and different numResults
DirectoryReader indexReader = DirectoryReader.open(indexDir);
TaxonomyReader taxoReader = new DirectoryTaxonomyReader(taxoDir);
IndexSearcher searcher = newSearcher(indexReader);
FacetsCollector sfc = new FacetsCollector();
TermQuery q = new TermQuery(A);
searcher.search(q, sfc);
Facets facets = getTaxonomyFacetCounts(taxoReader, getConfig(), sfc);
FacetResult result = facets.getTopChildren(NUM_CHILDREN_CP_A, CP_A);
assertEquals(-1, result.value.intValue());