// fail:
IndexReader oldReader = reader;
// make sure we get a cache hit when we reopen reader
// that had no change to deletions
writer.deleteDocuments(new Term("foo", "bar"));
reader = refreshReader(reader);
assertTrue(reader == oldReader);
int missCount = filter.missCount;
docs = searcher.search(constantScore, 1);
assertEquals("[just filter] Should find a hit...", 1, docs.totalHits);