miner_tests.cpp

// Copyright (c) 2011-2015 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.

#include <chainparams.h>
#include <coins.h>
#include <consensus/consensus.h>
#include <consensus/merkle.h>
#include <consensus/tx_verify.h>
#include <consensus/validation.h>
#include <validation.h>
#include <masternode/masternode-payments.h>
#include <miner.h>
#include <policy/policy.h>
#include <pow.h>
#include <pubkey.h>
#include <script/standard.h>
#include <txmempool.h>
#include <uint256.h>
#include <util.h>
#include <utilstrencodings.h>

#include <test/test_dash.h>

#include <memory>

#include <boost/test/unit_test.hpp>

BOOST_FIXTURE_TEST_SUITE(miner_tests, TestingSetup)

// BOOST_CHECK_EXCEPTION predicates to check the specific validation error
class HasReason {
public:
    HasReason(const std::string& reason) : m_reason(reason) {}
    bool operator() (const std::runtime_error& e) const {
        return std::string(e.what()).find(m_reason) != std::string::npos;
    };
private:
    const std::string m_reason;
};

static CFeeRate blockMinFeeRate = CFeeRate(DEFAULT_BLOCK_MIN_TX_FEE);

static BlockAssembler AssemblerForTest(const CChainParams& params) {
    BlockAssembler::Options options;

    options.nBlockMaxSize = DEFAULT_BLOCK_MAX_SIZE;
    options.blockMinFeeRate = blockMinFeeRate;
    return BlockAssembler(params, options);
}

static
struct {
    unsigned char extranonce;
    unsigned int nonce;
} blockinfo[] = {
    {0, 0x0017f257}, {0, 0x000d4581}, {0, 0x0048042c}, {0, 0x0025bff0},
    {0, 0x2002d3f8}, {0, 0x6001161f}, {0, 0xe000c5e5}, {0, 0x2000cce2},
    {0, 0x40004753}, {0, 0x80025297}, {0, 0x600009de}, {0, 0x6005780c},
    {0, 0x40025ae9}, {0, 0xc000341c}, {0, 0xc0053062}, {0, 0x40002f90},
    {0, 0xc00047ae}, {0, 0xa0015716}, {0, 0x2000d499}, {0, 0x80009b45},
    {0, 0xc000a7c9}, {0, 0x8001f8ba}, {0, 0xc000d147}, {0, 0x60018ac3},
    {0, 0xc000a9ac}, {0, 0xa003f6e6}, {0, 0x2007436e}, {0, 0xc0013f28},
    {0, 0x00010892}, {0, 0xa0000027}, {0, 0x40008de9}, {0, 0x400019f3},
    {0, 0x00025b86}, {0, 0x80002799}, {0, 0xc001eb0e}, {0, 0xe003e950},
    {0, 0xe001ff87}, {0, 0x000158b0}, {0, 0x600189da}, {0, 0x0000028c},
    {0, 0x600014ca}, {0, 0x60000e4d}, {0, 0xc0000820}, {0, 0xa005184e},
    {0, 0x40012b22}, {0, 0xe0028f6b}, {0, 0xe0027bce}, {0, 0xa0007b51},
    {0, 0x8002496d}, {0, 0xc001f211}, {0, 0x00032bf0}, {0, 0x4002d767},
    {0, 0x6008410a}, {0, 0x800361c3}, {0, 0xe000f80d}, {0, 0xe009ac97},
    {0, 0x80002103}, {0, 0x6001fab4}, {0, 0x4002843b}, {0, 0x6002b67c},
    {0, 0xa000faf3}, {0, 0x6000949e}, {0, 0x80000f1f}, {0, 0x6000c946},
    {0, 0xe00314b3}, {0, 0x20012bbf}, {0, 0x00009c7e}, {0, 0x2003e63a},
    {0, 0x20025157}, {0, 0x80041ff5}, {0, 0x60012a6c}, {0, 0x4000119b},
    {0, 0xc000a454}, {0, 0x20042c4b}, {0, 0x0003003c}, {0, 0x000558b2},
    {0, 0x2000198c}, {0, 0x200b0b3e}, {0, 0x4001c1e4}, {0, 0x80000034},
    {0, 0xe00039d1}, {0, 0xc001ded3}, {0, 0x80006740}, {0, 0xc0014546},
    {0, 0x00036a1a}, {0, 0xa001ae9c}, {0, 0x6000a148}, {0, 0xe001fd73},
    {0, 0xa001cebb}, {0, 0xa000d4b8}, {0, 0xe00154b3}, {0, 0x40004bec},
    {0, 0xc003f230}, {0, 0xe0069a26}, {0, 0xa00072b4}, {0, 0xc002e1b2},
    {0, 0x20009a02}, {0, 0xc0004a10}, {0, 0xe0045a11}, {0, 0x60034d09},
    {0, 0x000073ff}, {0, 0x00003f1c}, {0, 0x4002c4fd}, {0, 0x2000bb60},
    {0, 0x4000b6b6}, {0, 0x6000ea25}, {0, 0x400989d9}, {0, 0xc000877f},
    {0, 0x6000d17c}, {0, 0xc0009228}, {0, 0x4002827f}, {0, 0x80056a85},
    {0, 0x40045af7}, {0, 0x6000df7a}, {0, 0xe00131a1}, {0, 0x40021386},
    {0, 0xa00891b5}, {0, 0x60007854}, {0, 0x60021730}
};

CBlockIndex CreateBlockIndex(int nHeight)
{
    CBlockIndex index;
    index.nHeight = nHeight;
    index.pprev = chainActive.Tip();
    return index;
}

bool TestSequenceLocks(const CTransaction &tx, int flags)
{
    LOCK(mempool.cs);
    return CheckSequenceLocks(tx, flags);
}

// Test suite for ancestor feerate transaction selection.
// Implemented as an additional function, rather than a separate test case,
// to allow reusing the blockchain created in CreateNewBlock_validity.
void TestPackageSelection(const CChainParams& chainparams, const CScript& scriptPubKey, const std::vector<CTransactionRef>& txFirst) EXCLUSIVE_LOCKS_REQUIRED(::mempool.cs)
{
    // Disable free transactions, otherwise TX selection is non-deterministic
    gArgs.SoftSetArg("-blockprioritysize", "0");

    // Test the ancestor feerate transaction selection.
    TestMemPoolEntryHelper entry;

    // Test that a medium fee transaction will be selected after a higher fee
    // rate package with a low fee rate parent.
    CMutableTransaction tx;
    tx.vin.resize(1);
    tx.vin[0].scriptSig = CScript() << OP_1;
    tx.vin[0].prevout.hash = txFirst[0]->GetHash();
    tx.vin[0].prevout.n = 0;
    tx.vout.resize(1);
    tx.vout[0].nValue = 5000000000LL - 1000;
    // This tx has a low fee: 1000 satoshis
    uint256 hashParentTx = tx.GetHash(); // save this txid for later use
    mempool.addUnchecked(hashParentTx, entry.Fee(1000).Time(GetTime()).SpendsCoinbase(true).FromTx(tx));

    // This tx has a medium fee: 10000 satoshis
    tx.vin[0].prevout.hash = txFirst[1]->GetHash();
    tx.vout[0].nValue = 5000000000LL - 10000;
    uint256 hashMediumFeeTx = tx.GetHash();
    mempool.addUnchecked(hashMediumFeeTx, entry.Fee(10000).Time(GetTime()).SpendsCoinbase(true).FromTx(tx));

    // This tx has a high fee, but depends on the first transaction
    tx.vin[0].prevout.hash = hashParentTx;
    tx.vout[0].nValue = 5000000000LL - 1000 - 50000; // 50k satoshi fee
    uint256 hashHighFeeTx = tx.GetHash();
    mempool.addUnchecked(hashHighFeeTx, entry.Fee(50000).Time(GetTime()).SpendsCoinbase(false).FromTx(tx));

    std::unique_ptr<CBlockTemplate> pblocktemplate = AssemblerForTest(chainparams).CreateNewBlock(scriptPubKey);
    BOOST_CHECK(pblocktemplate->block.vtx[1]->GetHash() == hashParentTx);
    BOOST_CHECK(pblocktemplate->block.vtx[2]->GetHash() == hashHighFeeTx);
    BOOST_CHECK(pblocktemplate->block.vtx[3]->GetHash() == hashMediumFeeTx);

    // Test that a package below the block min tx fee doesn't get included
    tx.vin[0].prevout.hash = hashHighFeeTx;
    tx.vout[0].nValue = 5000000000LL - 1000 - 50000; // 0 fee
    uint256 hashFreeTx = tx.GetHash();
    mempool.addUnchecked(hashFreeTx, entry.Fee(0).FromTx(tx));
    size_t freeTxSize = ::GetSerializeSize(tx, SER_NETWORK, PROTOCOL_VERSION);

    // Calculate a fee on child transaction that will put the package just
    // below the block min tx fee (assuming 1 child tx of the same size).
    CAmount feeToUse = blockMinFeeRate.GetFee(2*freeTxSize) - 1;

    tx.vin[0].prevout.hash = hashFreeTx;
    tx.vout[0].nValue = 5000000000LL - 1000 - 50000 - feeToUse;
    uint256 hashLowFeeTx = tx.GetHash();
    mempool.addUnchecked(hashLowFeeTx, entry.Fee(feeToUse).FromTx(tx));
    pblocktemplate = AssemblerForTest(chainparams).CreateNewBlock(scriptPubKey);
    // Verify that the free tx and the low fee tx didn't get selected
    for (size_t i=0; i<pblocktemplate->block.vtx.size(); ++i) {
        BOOST_CHECK(pblocktemplate->block.vtx[i]->GetHash() != hashFreeTx);
        BOOST_CHECK(pblocktemplate->block.vtx[i]->GetHash() != hashLowFeeTx);
    }

    // Test that packages above the min relay fee do get included, even if one
    // of the transactions is below the min relay fee
    // Remove the low fee transaction and replace with a higher fee transaction
    mempool.removeRecursive(tx);
    tx.vout[0].nValue -= 2; // Now we should be just over the min relay fee
    hashLowFeeTx = tx.GetHash();
    mempool.addUnchecked(hashLowFeeTx, entry.Fee(feeToUse+2).FromTx(tx));
    pblocktemplate = AssemblerForTest(chainparams).CreateNewBlock(scriptPubKey);
    BOOST_CHECK(pblocktemplate->block.vtx[4]->GetHash() == hashFreeTx);
    BOOST_CHECK(pblocktemplate->block.vtx[5]->GetHash() == hashLowFeeTx);

    // Test that transaction selection properly updates ancestor fee
    // calculations as ancestor transactions get included in a block.
    // Add a 0-fee transaction that has 2 outputs.
    tx.vin[0].prevout.hash = txFirst[2]->GetHash();
    tx.vout.resize(2);
    tx.vout[0].nValue = 5000000000LL - 100000000;
    tx.vout[1].nValue = 100000000; // 1BTC output
    uint256 hashFreeTx2 = tx.GetHash();
    mempool.addUnchecked(hashFreeTx2, entry.Fee(0).SpendsCoinbase(true).FromTx(tx));

    // This tx can't be mined by itself
    tx.vin[0].prevout.hash = hashFreeTx2;
    tx.vout.resize(1);
    feeToUse = blockMinFeeRate.GetFee(freeTxSize);
    tx.vout[0].nValue = 5000000000LL - 100000000 - feeToUse;
    uint256 hashLowFeeTx2 = tx.GetHash();
    mempool.addUnchecked(hashLowFeeTx2, entry.Fee(feeToUse).SpendsCoinbase(false).FromTx(tx));
    pblocktemplate = AssemblerForTest(chainparams).CreateNewBlock(scriptPubKey);

    // Verify that this tx isn't selected.
    for (size_t i=0; i<pblocktemplate->block.vtx.size(); ++i) {
        BOOST_CHECK(pblocktemplate->block.vtx[i]->GetHash() != hashFreeTx2);
        BOOST_CHECK(pblocktemplate->block.vtx[i]->GetHash() != hashLowFeeTx2);
    }

    // This tx will be mineable, and should cause hashLowFeeTx2 to be selected
    // as well.
    tx.vin[0].prevout.n = 1;
    tx.vout[0].nValue = 100000000 - 10000; // 10k satoshi fee
    mempool.addUnchecked(tx.GetHash(), entry.Fee(10000).FromTx(tx));
    pblocktemplate = AssemblerForTest(chainparams).CreateNewBlock(scriptPubKey);
    BOOST_CHECK(pblocktemplate->block.vtx[8]->GetHash() == hashLowFeeTx2);
}

// NOTE: These tests rely on CreateNewBlock doing its own self-validation!
BOOST_AUTO_TEST_CASE(CreateNewBlock_validity)
{
    const auto chainParams = CreateChainParams(CBaseChainParams::MAIN);
    const CChainParams& chainparams = *chainParams;
    CScript scriptPubKey = CScript() << ParseHex("04678afdb0fe5548271967f1a67130b7105cd6a828e03909a67962e0ea1f61deb649f6bc3f4cef38c4f35504e51ec112de5c384df7ba0b8d578a4c702b6bf11d5f") << OP_CHECKSIG;
    std::unique_ptr<CBlockTemplate> pblocktemplate, pemptyblocktemplate;
    CMutableTransaction tx;
    CScript script;
    uint256 hash;
    TestMemPoolEntryHelper entry;
    entry.nFee = 11;
    entry.nHeight = 11;

    fCheckpointsEnabled = false;

    // Simple block creation, nothing special yet:
    BOOST_CHECK(pemptyblocktemplate = AssemblerForTest(chainparams).CreateNewBlock(scriptPubKey));

    // We can't make transactions until we have inputs
    // Therefore, load 100 blocks :)
    int baseheight = 0;
    std::vector<CTransactionRef> txFirst;

    auto createAndProcessEmptyBlock = [&]() {
        int i = chainActive.Height();
        CBlock *pblock = &pemptyblocktemplate->block; // pointer for convenience
        {
            LOCK(cs_main);
            pblock->nVersion = 2;
            pblock->nTime = chainActive.Tip()->GetMedianTimePast()+1;
            CMutableTransaction txCoinbase(*pblock->vtx[0]);
            txCoinbase.nVersion = 1;
            txCoinbase.vin[0].scriptSig = CScript() << (chainActive.Height() + 1);
            txCoinbase.vin[0].scriptSig.push_back(blockinfo[i].extranonce);
            txCoinbase.vin[0].scriptSig.push_back(chainActive.Height());
            txCoinbase.vout[0].scriptPubKey = CScript();
            pblock->vtx[0] = MakeTransactionRef(std::move(txCoinbase));
            if (txFirst.size() == 0)
                baseheight = chainActive.Height();
            if (txFirst.size() < 4)
                txFirst.push_back(pblock->vtx[0]);
            pblock->hashMerkleRoot = BlockMerkleRoot(*pblock);
            pblock->nNonce = blockinfo[i].nonce;

            // This will usually succeed in the first round as we take the nonce from blockinfo
            // It's however usefull when adding new blocks with unknown nonces (you should add the found block to blockinfo)
            while (!CheckProofOfWork(pblock->GetHash(), pblock->nBits, chainparams.GetConsensus())) {
                pblock->nNonce++;
            }
        }
        std::shared_ptr<const CBlock> shared_pblock = std::make_shared<const CBlock>(*pblock);
        BOOST_CHECK(ProcessNewBlock(chainparams, shared_pblock, true, nullptr));
        pblock->hashPrevBlock = pblock->GetHash();
    };

    for (unsigned int i = 0; i < sizeof(blockinfo)/sizeof(*blockinfo) - 1; ++i)
    {
        createAndProcessEmptyBlock();
    }

    {
    LOCK(cs_main);
    LOCK(::mempool.cs);

    // Just to make sure we can still make simple blocks
    BOOST_CHECK(pblocktemplate = AssemblerForTest(chainparams).CreateNewBlock(scriptPubKey));

    const CAmount BLOCKSUBSIDY = 500*COIN;
    const CAmount LOWFEE = CENT;
    const CAmount HIGHFEE = COIN;
    const CAmount HIGHERFEE = 4*COIN;

    // block sigops > limit: 1000 CHECKMULTISIG + 1
    tx.vin.resize(1);
    // NOTE: OP_NOP is used to force 20 SigOps for the CHECKMULTISIG
    tx.vin[0].scriptSig = CScript() << OP_0 << OP_0 << OP_0 << OP_NOP << OP_CHECKMULTISIG << OP_1;
    tx.vin[0].prevout.hash = txFirst[0]->GetHash();
    tx.vin[0].prevout.n = 0;
    tx.vout.resize(1);
    tx.vout[0].nValue = BLOCKSUBSIDY;
    for (unsigned int i = 0; i < 1001; ++i)
    {
        tx.vout[0].nValue -= LOWFEE;
        hash = tx.GetHash();
        bool spendsCoinbase = i == 0; // only first tx spends coinbase
        // If we don't set the # of sig ops in the CTxMemPoolEntry, template creation fails
        mempool.addUnchecked(hash, entry.Fee(LOWFEE).Time(GetTime()).SpendsCoinbase(spendsCoinbase).FromTx(tx));
        tx.vin[0].prevout.hash = hash;
    }

    BOOST_CHECK_EXCEPTION(AssemblerForTest(chainparams).CreateNewBlock(scriptPubKey), std::runtime_error, HasReason("bad-blk-sigops"));
    mempool.clear();

    tx.vin[0].prevout.hash = txFirst[0]->GetHash();
    tx.vout[0].nValue = BLOCKSUBSIDY;
    for (unsigned int i = 0; i < 1001; ++i)
    {
        tx.vout[0].nValue -= LOWFEE;
        hash = tx.GetHash();
        bool spendsCoinbase = i == 0; // only first tx spends coinbase
        // If we do set the # of sig ops in the CTxMemPoolEntry, template creation passes
        mempool.addUnchecked(hash, entry.Fee(LOWFEE).Time(GetTime()).SpendsCoinbase(spendsCoinbase).SigOps(20).FromTx(tx));
        tx.vin[0].prevout.hash = hash;
    }
    BOOST_CHECK(pblocktemplate = AssemblerForTest(chainparams).CreateNewBlock(scriptPubKey));
    mempool.clear();

    // block size > limit
    tx.vin[0].scriptSig = CScript();
    // 18 * (520char + DROP) + OP_1 = 9433 bytes
    std::vector<unsigned char> vchData(520);
    for (unsigned int i = 0; i < 18; ++i)
        tx.vin[0].scriptSig << vchData << OP_DROP;
    tx.vin[0].scriptSig << OP_1;
    tx.vin[0].prevout.hash = txFirst[0]->GetHash();
    tx.vout[0].nValue = BLOCKSUBSIDY;
    for (unsigned int i = 0; i < 128; ++i)
    {
        tx.vout[0].nValue -= LOWFEE;
        hash = tx.GetHash();
        bool spendsCoinbase = i == 0; // only first tx spends coinbase
        mempool.addUnchecked(hash, entry.Fee(LOWFEE).Time(GetTime()).SpendsCoinbase(spendsCoinbase).FromTx(tx));
        tx.vin[0].prevout.hash = hash;
    }
    BOOST_CHECK(pblocktemplate = AssemblerForTest(chainparams).CreateNewBlock(scriptPubKey));
    mempool.clear();

    // orphan in mempool, template creation fails
    hash = tx.GetHash();
    mempool.addUnchecked(hash, entry.Fee(LOWFEE).Time(GetTime()).FromTx(tx));
    BOOST_CHECK_EXCEPTION(AssemblerForTest(chainparams).CreateNewBlock(scriptPubKey), std::runtime_error, HasReason("bad-txns-inputs-missingorspent"));
    mempool.clear();

    // child with higher feerate than parent
    tx.vin[0].scriptSig = CScript() << OP_1;
    tx.vin[0].prevout.hash = txFirst[1]->GetHash();
    tx.vout[0].nValue = BLOCKSUBSIDY-HIGHFEE;
    hash = tx.GetHash();
    mempool.addUnchecked(hash, entry.Fee(HIGHFEE).Time(GetTime()).SpendsCoinbase(true).FromTx(tx));
    tx.vin[0].prevout.hash = hash;
    tx.vin.resize(2);
    tx.vin[1].scriptSig = CScript() << OP_1;
    tx.vin[1].prevout.hash = txFirst[0]->GetHash();
    tx.vin[1].prevout.n = 0;
    tx.vout[0].nValue = tx.vout[0].nValue+BLOCKSUBSIDY-HIGHERFEE; //First txn output + fresh coinbase - new txn fee
    hash = tx.GetHash();
    mempool.addUnchecked(hash, entry.Fee(HIGHERFEE).Time(GetTime()).SpendsCoinbase(true).FromTx(tx));
    BOOST_CHECK(pblocktemplate = AssemblerForTest(chainparams).CreateNewBlock(scriptPubKey));
    mempool.clear();

    // coinbase in mempool, template creation fails
    tx.vin.resize(1);
    tx.vin[0].prevout.SetNull();
    tx.vin[0].scriptSig = CScript() << OP_0 << OP_1;
    tx.vout[0].nValue = 0;
    hash = tx.GetHash();
    // give it a fee so it'll get mined
    mempool.addUnchecked(hash, entry.Fee(LOWFEE).Time(GetTime()).SpendsCoinbase(false).FromTx(tx));
    // Should throw bad-cb-multiple
    BOOST_CHECK_EXCEPTION(AssemblerForTest(chainparams).CreateNewBlock(scriptPubKey), std::runtime_error, HasReason("bad-cb-multiple"));
    mempool.clear();

    // invalid (pre-p2sh) txn in mempool, template creation fails
    tx.vin[0].prevout.hash = txFirst[0]->GetHash();
    tx.vin[0].prevout.n = 0;
    tx.vin[0].scriptSig = CScript() << OP_1;
    tx.vout[0].nValue = BLOCKSUBSIDY-LOWFEE;
    script = CScript() << OP_0;
    tx.vout[0].scriptPubKey = GetScriptForDestination(CScriptID(script));
    hash = tx.GetHash();
    mempool.addUnchecked(hash, entry.Fee(LOWFEE).Time(GetTime()).SpendsCoinbase(true).FromTx(tx));
    tx.vin[0].prevout.hash = hash;
    tx.vin[0].scriptSig = CScript() << std::vector<unsigned char>(script.begin(), script.end());
    tx.vout[0].nValue -= LOWFEE;
    hash = tx.GetHash();
    mempool.addUnchecked(hash, entry.Fee(LOWFEE).Time(GetTime()).SpendsCoinbase(false).FromTx(tx));
    // Should throw block-validation-failed
    BOOST_CHECK_EXCEPTION(AssemblerForTest(chainparams).CreateNewBlock(scriptPubKey), std::runtime_error, HasReason("block-validation-failed"));
    mempool.clear();

    // double spend txn pair in mempool, template creation fails
    tx.vin[0].prevout.hash = txFirst[0]->GetHash();
    tx.vin[0].scriptSig = CScript() << OP_1;
    tx.vout[0].nValue = BLOCKSUBSIDY-HIGHFEE;
    tx.vout[0].scriptPubKey = CScript() << OP_1;
    hash = tx.GetHash();
    mempool.addUnchecked(hash, entry.Fee(HIGHFEE).Time(GetTime()).SpendsCoinbase(true).FromTx(tx));
    tx.vout[0].scriptPubKey = CScript() << OP_2;
    hash = tx.GetHash();
    mempool.addUnchecked(hash, entry.Fee(HIGHFEE).Time(GetTime()).SpendsCoinbase(true).FromTx(tx));
    BOOST_CHECK_EXCEPTION(AssemblerForTest(chainparams).CreateNewBlock(scriptPubKey), std::runtime_error, HasReason("bad-txns-inputs-missingorspent"));
    mempool.clear();

    // subsidy changing
    // int nHeight = chainActive.Height();
    // // Create an actual 209999-long block chain (without valid blocks).
    // while (chainActive.Tip()->nHeight < 209999) {
    //     CBlockIndex* prev = chainActive.Tip();
    //     CBlockIndex* next = new CBlockIndex();
    //     next->phashBlock = new uint256(InsecureRand256());
    //     pcoinsTip->SetBestBlock(next->GetBlockHash());
    //     next->pprev = prev;
    //     next->nHeight = prev->nHeight + 1;
    //     next->BuildSkip();
    //     chainActive.SetTip(next);
    // }
    //BOOST_CHECK(pblocktemplate = BlockAssembler(chainparams).CreateNewBlock(scriptPubKey));
    // // Extend to a 210000-long block chain.
    // while (chainActive.Tip()->nHeight < 210000) {
    //     CBlockIndex* prev = chainActive.Tip();
    //     CBlockIndex* next = new CBlockIndex();
    //     next->phashBlock = new uint256(InsecureRand256());
    //     pcoinsTip->SetBestBlock(next->GetBlockHash());
    //     next->pprev = prev;
    //     next->nHeight = prev->nHeight + 1;
    //     next->BuildSkip();
    //     chainActive.SetTip(next);
    // }
    //BOOST_CHECK(pblocktemplate = BlockAssembler(chainparams).CreateNewBlock(scriptPubKey));
    // // Delete the dummy blocks again.
    // while (chainActive.Tip()->nHeight > nHeight) {
    //     CBlockIndex* del = chainActive.Tip();
    //     chainActive.SetTip(del->pprev);
    //     pcoinsTip->SetBestBlock(del->pprev->GetBlockHash());
    //     delete del->phashBlock;
    //     delete del;
    // }

    // non-final txs in mempool
    SetMockTime(chainActive.Tip()->GetMedianTimePast()+1);
    int flags = LOCKTIME_VERIFY_SEQUENCE|LOCKTIME_MEDIAN_TIME_PAST;
    // height map
    std::vector<int> prevheights;

    // relative height locked
    tx.nVersion = 2;
    tx.vin.resize(1);
    prevheights.resize(1);
    tx.vin[0].prevout.hash = txFirst[0]->GetHash(); // only 1 transaction
    tx.vin[0].prevout.n = 0;
    tx.vin[0].scriptSig = CScript() << OP_1;
    tx.vin[0].nSequence = chainActive.Tip()->nHeight + 1; // txFirst[0] is the 2nd block
    prevheights[0] = baseheight + 1;
    tx.vout.resize(1);
    tx.vout[0].nValue = BLOCKSUBSIDY-HIGHFEE;
    tx.vout[0].scriptPubKey = CScript() << OP_1;
    tx.nLockTime = 0;
    hash = tx.GetHash();
    mempool.addUnchecked(hash, entry.Fee(HIGHFEE).Time(GetTime()).SpendsCoinbase(true).FromTx(tx));
    BOOST_CHECK(CheckFinalTx(tx, flags)); // Locktime passes
    BOOST_CHECK(!TestSequenceLocks(tx, flags)); // Sequence locks fail
    BOOST_CHECK(SequenceLocks(tx, flags, &prevheights, CreateBlockIndex(chainActive.Tip()->nHeight + 2))); // Sequence locks pass on 2nd block

    // relative time locked
    tx.vin[0].prevout.hash = txFirst[1]->GetHash();
    tx.vin[0].nSequence = CTxIn::SEQUENCE_LOCKTIME_TYPE_FLAG | (((chainActive.Tip()->GetMedianTimePast()+1-chainActive[1]->GetMedianTimePast()) >> CTxIn::SEQUENCE_LOCKTIME_GRANULARITY) + 1); // txFirst[1] is the 3rd block
    prevheights[0] = baseheight + 2;
    hash = tx.GetHash();
    mempool.addUnchecked(hash, entry.Time(GetTime()).FromTx(tx));
    BOOST_CHECK(CheckFinalTx(tx, flags)); // Locktime passes
    BOOST_CHECK(!TestSequenceLocks(tx, flags)); // Sequence locks fail

    for (int i = 0; i < CBlockIndex::nMedianTimeSpan; i++)
        chainActive.Tip()->GetAncestor(chainActive.Tip()->nHeight - i)->nTime += 512; //Trick the MedianTimePast
    BOOST_CHECK(SequenceLocks(tx, flags, &prevheights, CreateBlockIndex(chainActive.Tip()->nHeight + 1))); // Sequence locks pass 512 seconds later
    for (int i = 0; i < CBlockIndex::nMedianTimeSpan; i++)
        chainActive.Tip()->GetAncestor(chainActive.Tip()->nHeight - i)->nTime -= 512; //undo tricked MTP

    // absolute height locked
    tx.vin[0].prevout.hash = txFirst[2]->GetHash();
    tx.vin[0].nSequence = CTxIn::SEQUENCE_FINAL - 1;
    prevheights[0] = baseheight + 3;
    tx.nLockTime = chainActive.Tip()->nHeight + 1;
    hash = tx.GetHash();
    mempool.addUnchecked(hash, entry.Time(GetTime()).FromTx(tx));
    BOOST_CHECK(!CheckFinalTx(tx, flags)); // Locktime fails
    BOOST_CHECK(TestSequenceLocks(tx, flags)); // Sequence locks pass
    BOOST_CHECK(IsFinalTx(tx, chainActive.Tip()->nHeight + 2, chainActive.Tip()->GetMedianTimePast())); // Locktime passes on 2nd block

    // absolute time locked
    tx.vin[0].prevout.hash = txFirst[3]->GetHash();
    tx.nLockTime = chainActive.Tip()->GetMedianTimePast();
    prevheights.resize(1);
    prevheights[0] = baseheight + 4;
    hash = tx.GetHash();
    mempool.addUnchecked(hash, entry.Time(GetTime()).FromTx(tx));
    BOOST_CHECK(!CheckFinalTx(tx, flags)); // Locktime fails
    BOOST_CHECK(TestSequenceLocks(tx, flags)); // Sequence locks pass
    BOOST_CHECK(IsFinalTx(tx, chainActive.Tip()->nHeight + 2, chainActive.Tip()->GetMedianTimePast() + 1)); // Locktime passes 1 second later

    // mempool-dependent transactions (not added)
    tx.vin[0].prevout.hash = hash;
    prevheights[0] = chainActive.Tip()->nHeight + 1;
    tx.nLockTime = 0;
    tx.vin[0].nSequence = 0;
    BOOST_CHECK(CheckFinalTx(tx, flags)); // Locktime passes
    BOOST_CHECK(TestSequenceLocks(tx, flags)); // Sequence locks pass
    tx.vin[0].nSequence = 1;
    BOOST_CHECK(!TestSequenceLocks(tx, flags)); // Sequence locks fail
    tx.vin[0].nSequence = CTxIn::SEQUENCE_LOCKTIME_TYPE_FLAG;
    BOOST_CHECK(TestSequenceLocks(tx, flags)); // Sequence locks pass
    tx.vin[0].nSequence = CTxIn::SEQUENCE_LOCKTIME_TYPE_FLAG | 1;
    BOOST_CHECK(!TestSequenceLocks(tx, flags)); // Sequence locks fail

    BOOST_CHECK(pblocktemplate = AssemblerForTest(chainparams).CreateNewBlock(scriptPubKey));

    // None of the of the absolute height/time locked tx should have made
    // it into the template because we still check IsFinalTx in CreateNewBlock,
    // but relative locked txs will if inconsistently added to mempool.
    // For now these will still generate a valid template until BIP68 soft fork
    BOOST_CHECK_EQUAL(pblocktemplate->block.vtx.size(), 3);
    // However if we advance height by 1 and time by 512, all of them should be mined
    for (int i = 0; i < CBlockIndex::nMedianTimeSpan; i++)
        chainActive.Tip()->GetAncestor(chainActive.Tip()->nHeight - i)->nTime += 512; //Trick the MedianTimePast

    } // unlock cs_main while calling createAndProcessEmptyBlock

    // Mine an empty block
    createAndProcessEmptyBlock();

    LOCK(cs_main);

    SetMockTime(chainActive.Tip()->GetMedianTimePast() + 1);

    BOOST_CHECK(pblocktemplate = AssemblerForTest(chainparams).CreateNewBlock(scriptPubKey));
    BOOST_CHECK_EQUAL(pblocktemplate->block.vtx.size(), 5);

    CValidationState state;
    InvalidateBlock(state, chainparams, chainActive.Tip());

    SetMockTime(0);
    mempool.clear();

    TestPackageSelection(chainparams, scriptPubKey, txFirst);

    fCheckpointsEnabled = true;
}

BOOST_AUTO_TEST_SUITE_END()