policy_fee_tests.cpp

// Copyright (c) 2020 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 <amount.h>
#include <policy/fees.h>
#include <validation.h>

#include <test/util/setup_common.h>

#include <boost/test/unit_test.hpp>

BOOST_FIXTURE_TEST_SUITE(policy_fee_tests, BasicTestingSetup)

BOOST_AUTO_TEST_CASE(FeeRounder)
{
    FeeFilterRounder fee_rounder{CFeeRate{1000}};

    // check that 1000 rounds to 974 or 1071
    std::set<CAmount> results;
    while (results.size() < 2) {
        results.emplace(fee_rounder.round(1000));
    }
    BOOST_CHECK_EQUAL(*results.begin(), 974);
    BOOST_CHECK_EQUAL(*++results.begin(), 1071);

    // check that negative amounts rounds to 0
    BOOST_CHECK_EQUAL(fee_rounder.round(-0), 0);
    BOOST_CHECK_EQUAL(fee_rounder.round(-1), 0);

    // check that MAX_MONEY rounds to 9170997
    BOOST_CHECK_EQUAL(fee_rounder.round(MAX_MONEY), 9170997);

    /* Doichain uses a different DEFAULT_MIN_RELAY_TX_FEE value than
       upstream Bitcoin.  Verify the expected rounding value for MAX_MONEY
       (which is used as fee filter during IBD) also for that.  */
    FeeFilterRounder nmc_rounder{CFeeRate{DEFAULT_MIN_RELAY_TX_FEE}};
    BOOST_CHECK_EQUAL(nmc_rounder.round(MAX_MONEY), 9452957);
}

BOOST_AUTO_TEST_SUITE_END()