Method TestPrioritisedMining

src/test/miner_tests.cpp:684–769

}

void MinerTestingSetup::TestPrioritisedMining(const CScript& scriptPubKey, const std::vector<CTransactionRef>& txFirst)
{
    auto mining{MakeMining()};
    BOOST_REQUIRE(mining);

    BlockCreateOptions options{
        .coinbase_output_script = scriptPubKey,
    };

    CTxMemPool& tx_mempool{MakeMempool()};
    LOCK(tx_mempool.cs);

    TestMemPoolEntryHelper entry;

    // Test that a tx below min fee but prioritised is included
    CMutableTransaction tx;
    tx.vin.resize(1);
    tx.vin[0].prevout.hash = txFirst[0]->GetHash();
    tx.vin[0].prevout.n = 0;
    tx.vin[0].scriptSig = CScript() << OP_1;
    tx.vout.resize(1);
    tx.vout[0].nValue = 5000000000LL; // 0 fee
    Txid hashFreePrioritisedTx = tx.GetHash();
    TryAddToMempool(tx_mempool, entry.Fee(0).Time(Now<NodeSeconds>()).SpendsCoinbase(true).FromTx(tx));
    tx_mempool.PrioritiseTransaction(hashFreePrioritisedTx, 5 * COIN);

    tx.vin[0].prevout.hash = txFirst[1]->GetHash();
    tx.vin[0].prevout.n = 0;
    tx.vout[0].nValue = 5000000000LL - 1000;
    // This tx has a low fee: 1000 satoshis
    Txid hashParentTx = tx.GetHash(); // save this txid for later use
    TryAddToMempool(tx_mempool, entry.Fee(1000).Time(Now<NodeSeconds>()).SpendsCoinbase(true).FromTx(tx));

    // This tx has a medium fee: 10000 satoshis
    tx.vin[0].prevout.hash = txFirst[2]->GetHash();
    tx.vout[0].nValue = 5000000000LL - 10000;
    Txid hashMediumFeeTx = tx.GetHash();
    TryAddToMempool(tx_mempool, entry.Fee(10000).Time(Now<NodeSeconds>()).SpendsCoinbase(true).FromTx(tx));
    tx_mempool.PrioritiseTransaction(hashMediumFeeTx, -5 * COIN);

    // This tx also has a low fee, but is prioritised
    tx.vin[0].prevout.hash = hashParentTx;
    tx.vout[0].nValue = 5000000000LL - 1000 - 1000; // 1000 satoshi fee
    Txid hashPrioritsedChild = tx.GetHash();
    TryAddToMempool(tx_mempool, entry.Fee(1000).Time(Now<NodeSeconds>()).SpendsCoinbase(false).FromTx(tx));
    tx_mempool.PrioritiseTransaction(hashPrioritsedChild, 2 * COIN);

    // Test that transaction selection properly updates ancestor fee calculations as prioritised
    // parents get included in a block. Create a transaction with two prioritised ancestors, each
    // included by itself: FreeParent <- FreeChild <- FreeGrandchild.
    // When FreeParent is added, a modified entry will be created for FreeChild + FreeGrandchild
    // FreeParent's prioritisation should not be included in that entry.
    // When FreeChild is included, FreeChild's prioritisation should also not be included.
    tx.vin[0].prevout.hash = txFirst[3]->GetHash();
    tx.vout[0].nValue = 5000000000LL; // 0 fee
    Txid hashFreeParent = tx.GetHash();
    TryAddToMempool(tx_mempool, entry.Fee(0).SpendsCoinbase(true).FromTx(tx));
    tx_mempool.PrioritiseTransaction(hashFreeParent, 10 * COIN);