public void testExhaustive() throws Exception {
    Random random = new Random(0); // will iteratively make more debuggable, each time it breaks
    for (int totalInsertions = 0; totalInsertions < 200; totalInsertions++) {

      List<Sink> sinks = new ArrayList<>();
      for (int chunkSize = 4; chunkSize <= 32; chunkSize++) {