int ndocsExpected = 20; // first 20 reuters docs.
assertEquals("wrong number of docs in the index!", ndocsExpected, ir.numDocs());
ir.close();
// Make sure we have 3 segments:
SegmentInfos infos = new SegmentInfos();
infos.read(benchmark.getRunData().getDirectory());
assertEquals(3, infos.size());
}