//
// Helper: create two dummy transactions, each with
// two outputs.  The first has 11 and 50 CENT outputs
// paid to a TX_PUBKEY, the second 21 and 22 CENT outputs
// paid to a TX_PUBKEYHASH.
//
static std::vector<CMutableTransaction>
SetupDummyInputs(CBasicKeyStore& keystoreRet, CCoinsViewCache& coinsRet)
{
    std::vector<CMutableTransaction> dummyTransactions;
    dummyTransactions.resize(2);

    // Add some keys to the keystore:
    CKey key[4];
    for (int i = 0; i < 4; i++)
    {
        key[i].MakeNewKey(i % 2);
        keystoreRet.AddKey(key[i]);
    }

    // Create some dummy input transactions
    dummyTransactions[0].vout.resize(2);
    dummyTransactions[0].vout[0].nValue = 11*CENT;
    dummyTransactions[0].vout[0].scriptPubKey << ToByteVector(key[0].GetPubKey()) << OP_CHECKSIG;
    dummyTransactions[0].vout[1].nValue = 50*CENT;
    dummyTransactions[0].vout[1].scriptPubKey << ToByteVector(key[1].GetPubKey()) << OP_CHECKSIG;
    coinsRet.ModifyCoins(dummyTransactions[0].GetHash())->FromTx(dummyTransactions[0], 0);

    dummyTransactions[1].vout.resize(2);
    dummyTransactions[1].vout[0].nValue = 21*CENT;
    dummyTransactions[1].vout[0].scriptPubKey = GetScriptForDestination(key[2].GetPubKey().GetID());
    dummyTransactions[1].vout[1].nValue = 22*CENT;
    dummyTransactions[1].vout[1].scriptPubKey = GetScriptForDestination(key[3].GetPubKey().GetID());
    coinsRet.ModifyCoins(dummyTransactions[1].GetHash())->FromTx(dummyTransactions[1], 0);

    return dummyTransactions;
}
/**
 * Construct a dummy tx that provides the given script as input
 * for further tests in the given CCoinsView.  The txid is returned
 * to refer to it.  The "index" is always 0.  The output's
 * value is always set to 1000 COIN, since it doesn't matter for
 * the tests we are interested in.
 * @param scr The script that should be provided as output.
 * @param nHeight The height of the coin.
 * @param view Add it to this view.
 * @return The txid.
 */
static uint256
addTestCoin (const CScript& scr, unsigned nHeight, CCoinsViewCache& view)
{
  CMutableTransaction mtx;
  mtx.vout.push_back (CTxOut (1000 * COIN, scr));
  const CTransaction tx(mtx);

  CCoinsModifier entry = view.ModifyCoins (tx.GetHash ());
  *entry = CCoins (tx, nHeight);

  return tx.GetHash ();
}
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/**
 * Builds a creationTx from scriptPubKey and a spendingTx from scriptSig
 * and witness such that spendingTx spends output zero of creationTx.
 * Also inserts creationTx's output into the coins view.
 */
void BuildTxs(CMutableTransaction& spendingTx, CCoinsViewCache& coins, CMutableTransaction& creationTx, const CScript& scriptPubKey, const CScript& scriptSig, const CTxInWitness& witness)
{
    creationTx.nVersion = 1;
    creationTx.vin.resize(1);
    creationTx.vin[0].prevout.SetNull();
    creationTx.vin[0].scriptSig = CScript();
    creationTx.wit.vtxinwit.resize(1);
    creationTx.vout.resize(1);
    creationTx.vout[0].nValue = 1;
    creationTx.vout[0].scriptPubKey = scriptPubKey;

    spendingTx.nVersion = 1;
    spendingTx.vin.resize(1);
    spendingTx.vin[0].prevout.hash = creationTx.GetHash();
    spendingTx.vin[0].prevout.n = 0;
    spendingTx.vin[0].scriptSig = scriptSig;
    spendingTx.wit.vtxinwit.resize(1);
    spendingTx.wit.vtxinwit[0] = witness;
    spendingTx.vout.resize(1);
    spendingTx.vout[0].nValue = 1;
    spendingTx.vout[0].scriptPubKey = CScript();

    coins.ModifyCoins(creationTx.GetHash())->FromTx(creationTx, 0);
}