public void TestWithSingleTransaction()
        {
            /*
                coinbaseHash: 357deb5f66416ac7bd10d21557f50d358d85581c4c2e725dc1113cd277869a1a
                merkle-tree withFirst() - first: 357deb5f66416ac7bd10d21557f50d358d85581c4c2e725dc1113cd277869a1a
                data: [null,[53,242,80,55,174,213,162,52,45,204,185,251,93,86,89,207,225,108,2,213,196,226,105,86,44,36,81,78,26,93,182,160]]
                steps: [[53,242,80,55,174,213,162,52,45,204,185,251,93,86,89,207,225,108,2,213,196,226,105,86,44,36,81,78,26,93,182,160]]
                => f: 357deb5f66416ac7bd10d21557f50d358d85581c4c2e725dc1113cd277869a1a step: 35f25037aed5a2342dccb9fb5d5659cfe16c02d5c4e269562c24514e1a5db6a0 buffer.contact([f,s]): 357deb5f66416ac7bd10d21557f50d358d85581c4c2e725dc1113cd277869a1a35f25037aed5a2342dccb9fb5d5659cfe16c02d5c4e269562c24514e1a5db6a0
                |-> new f: da307cebe47b9c45046ef74cb4d800d8c90ad8bf1b542d501966fb2dae44b129
                final: da307cebe47b9c45046ef74cb4d800d8c90ad8bf1b542d501966fb2dae44b129
                merkleRoot: 29b144ae2dfb6619502d541bbfd80ac9d800d8b44cf76e04459c7be4eb7c30da
            */

            // block template
            const string json = 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            var blockTemplateObject = JsonConvert.DeserializeObject<DaemonResponse<BlockTemplate>>(json);
            _blockTemplate = blockTemplateObject.Result;

            var hashList = _blockTemplate.Transactions.GetHashList();
            var tree = new MerkleTree(hashList);

            // tests steps
            tree.Steps.Count.Should().Equal(1);
            tree.Branches.Count.Should().Equal(1);
            tree.Steps.First().ToHexString().Should().Equal("35f25037aed5a2342dccb9fb5d5659cfe16c02d5c4e269562c24514e1a5db6a0");

            // check root
            var root = tree.WithFirst("357deb5f66416ac7bd10d21557f50d358d85581c4c2e725dc1113cd277869a1a".HexToByteArray()).ReverseBuffer();
            root.ToHexString().Should().Equal("29b144ae2dfb6619502d541bbfd80ac9d800d8b44cf76e04459c7be4eb7c30da");
        }
        public void TestWithZeroTransaction()
        {
            /*
                coinbaseHash: a3291f854e60860ec74caf232ed34f98d0ff447dd7d38dbd7d451462b4b6f263
                merkle-tree withFirst() - first: a3291f854e60860ec74caf232ed34f98d0ff447dd7d38dbd7d451462b4b6f263
                steps: []
                final: a3291f854e60860ec74caf232ed34f98d0ff447dd7d38dbd7d451462b4b6f263
                merkleRoot: 63f2b6b46214457dbd8dd3d77d44ffd0984fd32e23af4cc70e86604e851f29a3
             */

            // block template
            const string json = "{\"result\":{\"version\":2,\"previousblockhash\":\"1a47638fd58c3b90cc3b2a7f1973dcdf545be4474d2157af28ad6ce7767acb09\",\"transactions\":[],\"coinbaseaux\":{\"flags\":\"062f503253482f\"},\"coinbasevalue\":5000000000,\"target\":\"000000ffff000000000000000000000000000000000000000000000000000000\",\"mintime\":1403563551,\"mutable\":[\"time\",\"transactions\",\"prevblock\"],\"noncerange\":\"00000000ffffffff\",\"sigoplimit\":20000,\"sizelimit\":1000000,\"curtime\":1403563962,\"bits\":\"1e00ffff\",\"height\":313498},\"error\":null,\"id\":1}";
            var blockTemplateObject = JsonConvert.DeserializeObject<DaemonResponse<BlockTemplate>>(json);
            _blockTemplate = blockTemplateObject.Result;

            var hashList = _blockTemplate.Transactions.GetHashList();
            var tree = new MerkleTree(hashList);

            // steps counts should be zero
            tree.Steps.Count.Should().Equal(0);
            tree.Branches.Count.Should().Equal(0);

            // calculate the result
            var result = tree.WithFirst("a3291f854e60860ec74caf232ed34f98d0ff447dd7d38dbd7d451462b4b6f263".HexToByteArray());
            var root = result.ReverseBuffer();

            // check the result and root
            result.ToHexString().Should().Equal("a3291f854e60860ec74caf232ed34f98d0ff447dd7d38dbd7d451462b4b6f263");
            root.ToHexString().Should().Equal("63f2b6b46214457dbd8dd3d77d44ffd0984fd32e23af4cc70e86604e851f29a3");
        }