public void AssertSimilarityOp(double overlap, IList common, IList <IList> vals, int index_bits, int minhash_bits)
        {
            IList <Value.HLLValue> hlls = new List <Value.HLLValue>();

            for (int i = 0; i < keys.Length; i++)
            {
                Record record = AssertSuccess("init other keys", keys[i],
                                              Operation.Delete(),
                                              HLLOperation.Add(HLLPolicy.Default, binName, vals[i], index_bits, minhash_bits),
                                              HLLOperation.Add(HLLPolicy.Default, binName, common, index_bits, minhash_bits),
                                              Operation.Get(binName)
                                              );

                IList result_list = record.GetList(binName);
                hlls.Add((Value.HLLValue)result_list[2]);
            }

            // Keep record around win binName is removed.
            Record r = AssertSuccess("other bin", key,
                                     Operation.Delete(),
                                     HLLOperation.Init(HLLPolicy.Default, binName + "other", index_bits, minhash_bits),
                                     HLLOperation.SetUnion(HLLPolicy.Default, binName, hlls),
                                     HLLOperation.Describe(binName)
                                     );

            IList rlist       = r.GetList(binName);
            IList description = (IList)rlist[1];

            AssertDescription("check desc", description, index_bits, minhash_bits);

            r = AssertSuccess("similarity and intersect_count", key,
                              HLLOperation.GetSimilarity(binName, hlls),
                              HLLOperation.GetIntersectCount(binName, hlls)
                              );

            rlist = r.GetList(binName);
            double sim                      = (double)rlist[0];
            long   intersect_count          = (long)rlist[1];
            double expected_similarity      = overlap;
            long   expected_intersect_count = common.Count;

            AssertHMHSimilarity("check sim", index_bits, minhash_bits, sim, expected_similarity, intersect_count, expected_intersect_count);
        }