mirror of
https://github.com/bitcoin/bitcoin.git
synced 2025-02-05 10:17:30 -05:00
62 lines
2.6 KiB
C++
62 lines
2.6 KiB
C++
|
// Copyright (c) 2021 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 <policy/fees.h>
|
||
|
|
#include <validation.h>
|
||
|
|
#include <wallet/coincontrol.h>
|
||
|
|
#include <wallet/test/util.h>
|
||
|
|
#include <wallet/test/wallet_test_fixture.h>
|
||
|
|
|
||
|
|
#include <boost/test/unit_test.hpp>
|
||
|
|
|
||
|
|
BOOST_FIXTURE_TEST_SUITE(spend_tests, WalletTestingSetup)
|
||
|
|
|
||
|
|
BOOST_FIXTURE_TEST_CASE(SubtractFee, TestChain100Setup)
|
||
|
|
{
|
||
|
|
CreateAndProcessBlock({}, GetScriptForRawPubKey(coinbaseKey.GetPubKey()));
|
||
|
|
auto wallet = CreateSyncedWallet(*m_node.chain, m_node.chainman->ActiveChain(), coinbaseKey);
|
||
|
|
|
||
|
|
// Check that a subtract-from-recipient transaction slightly less than the
|
||
|
|
// coinbase input amount does not create a change output (because it would
|
||
|
|
// be uneconomical to add and spend the output), and make sure it pays the
|
||
|
|
// leftover input amount which would have been change to the recipient
|
||
|
|
// instead of the miner.
|
||
|
|
auto check_tx = [&wallet](CAmount leftover_input_amount) {
|
||
|
|
CRecipient recipient{GetScriptForRawPubKey({}), 50 * COIN - leftover_input_amount, true /* subtract fee */};
|
||
|
|
CTransactionRef tx;
|
||
|
|
CAmount fee;
|
||
|
|
int change_pos = -1;
|
||
|
|
bilingual_str error;
|
||
|
|
CCoinControl coin_control;
|
||
|
|
coin_control.m_feerate.emplace(10000);
|
||
|
|
coin_control.fOverrideFeeRate = true;
|
||
|
|
FeeCalculation fee_calc;
|
||
|
|
BOOST_CHECK(wallet->CreateTransaction({recipient}, tx, fee, change_pos, error, coin_control, fee_calc));
|
||
|
|
BOOST_CHECK_EQUAL(tx->vout.size(), 1);
|
||
|
|
BOOST_CHECK_EQUAL(tx->vout[0].nValue, recipient.nAmount + leftover_input_amount - fee);
|
||
|
|
BOOST_CHECK_GT(fee, 0);
|
||
|
|
return fee;
|
||
|
|
};
|
||
|
|
|
||
|
|
// Send full input amount to recipient, check that only nonzero fee is
|
||
|
|
// subtracted (to_reduce == fee).
|
||
|
|
const CAmount fee{check_tx(0)};
|
||
|
|
|
||
|
|
// Send slightly less than full input amount to recipient, check leftover
|
||
|
|
// input amount is paid to recipient not the miner (to_reduce == fee - 123)
|
||
|
|
BOOST_CHECK_EQUAL(fee, check_tx(123));
|
||
|
|
|
||
|
|
// Send full input minus fee amount to recipient, check leftover input
|
||
|
|
// amount is paid to recipient not the miner (to_reduce == 0)
|
||
|
|
BOOST_CHECK_EQUAL(fee, check_tx(fee));
|
||
|
|
|
||
|
|
// Send full input minus more than the fee amount to recipient, check
|
||
|
|
// leftover input amount is paid to recipient not the miner (to_reduce ==
|
||
|
|
// -123). This overpays the recipient instead of overpaying the miner more
|
||
|
|
// than double the neccesary fee.
|
||
|
|
BOOST_CHECK_EQUAL(fee, check_tx(fee + 123));
|
||
|
|
}
|
||
|
|
|
||
|
|
BOOST_AUTO_TEST_SUITE_END()
|