1  // Copyright (c) 2020-2021 The Bitcoin Core developers
 2  // Distributed under the MIT software license, see the accompanying
 3  // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 4  
 5  #include <consensus/amount.h>
 6  #include <policy/fees.h>
 7  
 8  #include <boost/test/unit_test.hpp>
 9  
10  #include <set>
11  
12  BOOST_AUTO_TEST_SUITE(policy_fee_tests)
13  
14  BOOST_AUTO_TEST_CASE(FeeRounder)
15  {
16      FastRandomContext rng{/*fDeterministic=*/true};
17      FeeFilterRounder fee_rounder{CFeeRate{1000}, rng};
18  
19      // check that 1000 rounds to 974 or 1071
20      std::set<CAmount> results;
21      while (results.size() < 2) {
22          results.emplace(fee_rounder.round(1000));
23      }
24      BOOST_CHECK_EQUAL(*results.begin(), 974);
25      BOOST_CHECK_EQUAL(*++results.begin(), 1071);
26  
27      // check that negative amounts rounds to 0
28      BOOST_CHECK_EQUAL(fee_rounder.round(-0), 0);
29      BOOST_CHECK_EQUAL(fee_rounder.round(-1), 0);
30  
31      // check that MAX_MONEY rounds to 9170997
32      BOOST_CHECK_EQUAL(fee_rounder.round(MAX_MONEY), 9170997);
33  }
34  
35  BOOST_AUTO_TEST_SUITE_END()