int maxItemsPerBlock = 2*(Math.max(2, minItemsPerBlock-1)) + random.nextInt(100);
int lowFreqCutoff = _TestUtil.nextInt(random, 2, 100);
add(avoidCodecs,
new Lucene41PostingsFormat(minItemsPerBlock, maxItemsPerBlock),
new FSTPostingsFormat(),
new FSTOrdPostingsFormat(),
new FSTPulsing41PostingsFormat(1 + random.nextInt(20)),
new FSTOrdPulsing41PostingsFormat(1 + random.nextInt(20)),
new DirectPostingsFormat(LuceneTestCase.rarely(random) ? 1 : (LuceneTestCase.rarely(random) ? Integer.MAX_VALUE : maxItemsPerBlock),
LuceneTestCase.rarely(random) ? 1 : (LuceneTestCase.rarely(random) ? Integer.MAX_VALUE : lowFreqCutoff)),