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// Copyright (c) 2015-2022 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 <chain.h>
#include <chainparams.h>
#include <pow.h>
#include <test/util/random.h>
#include <test/util/setup_common.h>
#include <util/chaintype.h>
#include <boost/test/unit_test.hpp>
BOOST_FIXTURE_TEST_SUITE(pow_tests, BasicTestingSetup)
/* Test calculation of next difficulty target with no constraints applying */
BOOST_AUTO_TEST_CASE(get_next_work)
{
const auto chainParams = CreateChainParams(*m_node.args, ChainType::MAIN);
int64_t nLastRetargetTime = 1261130161; // Block #30240
CBlockIndex pindexLast;
pindexLast.nHeight = 32255;
pindexLast.nTime = 1262152739; // Block #32255
pindexLast.nBits = 0x1d00ffff;
// Here (and below): expected_nbits is calculated in
// CalculateNextWorkRequired(); redoing the calculation here would be just
// reimplementing the same code that is written in pow.cpp. Rather than
// copy that code, we just hardcode the expected result.
unsigned int expected_nbits = 0x1d00d86aU;
BOOST_CHECK_EQUAL(CalculateNextWorkRequired(&pindexLast, nLastRetargetTime, chainParams->GetConsensus()), expected_nbits);
BOOST_CHECK(PermittedDifficultyTransition(chainParams->GetConsensus(), pindexLast.nHeight+1, pindexLast.nBits, expected_nbits));
}
/* Test the constraint on the upper bound for next work */
BOOST_AUTO_TEST_CASE(get_next_work_pow_limit)
{
const auto chainParams = CreateChainParams(*m_node.args, ChainType::MAIN);
int64_t nLastRetargetTime = 1231006505; // Block #0
CBlockIndex pindexLast;
pindexLast.nHeight = 2015;
pindexLast.nTime = 1233061996; // Block #2015
pindexLast.nBits = 0x1d00ffff;
unsigned int expected_nbits = 0x1d00ffffU;
BOOST_CHECK_EQUAL(CalculateNextWorkRequired(&pindexLast, nLastRetargetTime, chainParams->GetConsensus()), expected_nbits);
BOOST_CHECK(PermittedDifficultyTransition(chainParams->GetConsensus(), pindexLast.nHeight+1, pindexLast.nBits, expected_nbits));
}
/* Test the constraint on the lower bound for actual time taken */
BOOST_AUTO_TEST_CASE(get_next_work_lower_limit_actual)
{
const auto chainParams = CreateChainParams(*m_node.args, ChainType::MAIN);
int64_t nLastRetargetTime = 1279008237; // Block #66528
CBlockIndex pindexLast;
pindexLast.nHeight = 68543;
pindexLast.nTime = 1279297671; // Block #68543
pindexLast.nBits = 0x1c05a3f4;
unsigned int expected_nbits = 0x1c0168fdU;
BOOST_CHECK_EQUAL(CalculateNextWorkRequired(&pindexLast, nLastRetargetTime, chainParams->GetConsensus()), expected_nbits);
BOOST_CHECK(PermittedDifficultyTransition(chainParams->GetConsensus(), pindexLast.nHeight+1, pindexLast.nBits, expected_nbits));
// Test that reducing nbits further would not be a PermittedDifficultyTransition.
unsigned int invalid_nbits = expected_nbits-1;
BOOST_CHECK(!PermittedDifficultyTransition(chainParams->GetConsensus(), pindexLast.nHeight+1, pindexLast.nBits, invalid_nbits));
}
/* Test the constraint on the upper bound for actual time taken */
BOOST_AUTO_TEST_CASE(get_next_work_upper_limit_actual)
{
const auto chainParams = CreateChainParams(*m_node.args, ChainType::MAIN);
int64_t nLastRetargetTime = 1263163443; // NOTE: Not an actual block time
CBlockIndex pindexLast;
pindexLast.nHeight = 46367;
pindexLast.nTime = 1269211443; // Block #46367
pindexLast.nBits = 0x1c387f6f;
unsigned int expected_nbits = 0x1d00e1fdU;
BOOST_CHECK_EQUAL(CalculateNextWorkRequired(&pindexLast, nLastRetargetTime, chainParams->GetConsensus()), expected_nbits);
BOOST_CHECK(PermittedDifficultyTransition(chainParams->GetConsensus(), pindexLast.nHeight+1, pindexLast.nBits, expected_nbits));
// Test that increasing nbits further would not be a PermittedDifficultyTransition.
unsigned int invalid_nbits = expected_nbits+1;
BOOST_CHECK(!PermittedDifficultyTransition(chainParams->GetConsensus(), pindexLast.nHeight+1, pindexLast.nBits, invalid_nbits));
}
BOOST_AUTO_TEST_CASE(CheckProofOfWork_test_negative_target)
{
const auto consensus = CreateChainParams(*m_node.args, ChainType::MAIN)->GetConsensus();
uint256 hash;
unsigned int nBits;
nBits = UintToArith256(consensus.powLimit).GetCompact(true);
hash = uint256{1};
BOOST_CHECK(!CheckProofOfWork(hash, nBits, consensus));
}
BOOST_AUTO_TEST_CASE(CheckProofOfWork_test_overflow_target)
{
const auto consensus = CreateChainParams(*m_node.args, ChainType::MAIN)->GetConsensus();
uint256 hash;
unsigned int nBits{~0x00800000U};
hash = uint256{1};
BOOST_CHECK(!CheckProofOfWork(hash, nBits, consensus));
}
BOOST_AUTO_TEST_CASE(CheckProofOfWork_test_too_easy_target)
{
const auto consensus = CreateChainParams(*m_node.args, ChainType::MAIN)->GetConsensus();
uint256 hash;
unsigned int nBits;
arith_uint256 nBits_arith = UintToArith256(consensus.powLimit);
nBits_arith *= 2;
nBits = nBits_arith.GetCompact();
hash = uint256{1};
BOOST_CHECK(!CheckProofOfWork(hash, nBits, consensus));
}
BOOST_AUTO_TEST_CASE(CheckProofOfWork_test_biger_hash_than_target)
{
const auto consensus = CreateChainParams(*m_node.args, ChainType::MAIN)->GetConsensus();
uint256 hash;
unsigned int nBits;
arith_uint256 hash_arith = UintToArith256(consensus.powLimit);
nBits = hash_arith.GetCompact();
hash_arith *= 2; // hash > nBits
hash = ArithToUint256(hash_arith);
BOOST_CHECK(!CheckProofOfWork(hash, nBits, consensus));
}
BOOST_AUTO_TEST_CASE(CheckProofOfWork_test_zero_target)
{
const auto consensus = CreateChainParams(*m_node.args, ChainType::MAIN)->GetConsensus();
uint256 hash;
unsigned int nBits;
arith_uint256 hash_arith{0};
nBits = hash_arith.GetCompact();
hash = ArithToUint256(hash_arith);
BOOST_CHECK(!CheckProofOfWork(hash, nBits, consensus));
}
BOOST_AUTO_TEST_CASE(GetBlockProofEquivalentTime_test)
{
const auto chainParams = CreateChainParams(*m_node.args, ChainType::MAIN);
std::vector<CBlockIndex> blocks(10000);
for (int i = 0; i < 10000; i++) {
blocks[i].pprev = i ? &blocks[i - 1] : nullptr;
blocks[i].nHeight = i;
blocks[i].nTime = 1269211443 + i * chainParams->GetConsensus().nPowTargetSpacing;
blocks[i].nBits = 0x207fffff; /* target 0x7fffff000... */
blocks[i].nChainWork = i ? blocks[i - 1].nChainWork + GetBlockProof(blocks[i - 1]) : arith_uint256(0);
}
for (int j = 0; j < 1000; j++) {
CBlockIndex *p1 = &blocks[InsecureRandRange(10000)];
CBlockIndex *p2 = &blocks[InsecureRandRange(10000)];
CBlockIndex *p3 = &blocks[InsecureRandRange(10000)];
int64_t tdiff = GetBlockProofEquivalentTime(*p1, *p2, *p3, chainParams->GetConsensus());
BOOST_CHECK_EQUAL(tdiff, p1->GetBlockTime() - p2->GetBlockTime());
}
}
void sanity_check_chainparams(const ArgsManager& args, ChainType chain_type)
{
const auto chainParams = CreateChainParams(args, chain_type);
const auto consensus = chainParams->GetConsensus();
// hash genesis is correct
BOOST_CHECK_EQUAL(consensus.hashGenesisBlock, chainParams->GenesisBlock().GetHash());
// target timespan is an even multiple of spacing
BOOST_CHECK_EQUAL(consensus.nPowTargetTimespan % consensus.nPowTargetSpacing, 0);
// genesis nBits is positive, doesn't overflow and is lower than powLimit
arith_uint256 pow_compact;
bool neg, over;
pow_compact.SetCompact(chainParams->GenesisBlock().nBits, &neg, &over);
BOOST_CHECK(!neg && pow_compact != 0);
BOOST_CHECK(!over);
BOOST_CHECK(UintToArith256(consensus.powLimit) >= pow_compact);
// check max target * 4*nPowTargetTimespan doesn't overflow -- see pow.cpp:CalculateNextWorkRequired()
if (!consensus.fPowNoRetargeting) {
arith_uint256 targ_max{UintToArith256(uint256{"FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF"})};
targ_max /= consensus.nPowTargetTimespan*4;
BOOST_CHECK(UintToArith256(consensus.powLimit) < targ_max);
}
}
BOOST_AUTO_TEST_CASE(ChainParams_MAIN_sanity)
{
sanity_check_chainparams(*m_node.args, ChainType::MAIN);
}
BOOST_AUTO_TEST_CASE(ChainParams_REGTEST_sanity)
{
sanity_check_chainparams(*m_node.args, ChainType::REGTEST);
}
BOOST_AUTO_TEST_CASE(ChainParams_TESTNET_sanity)
{
sanity_check_chainparams(*m_node.args, ChainType::TESTNET);
}
BOOST_AUTO_TEST_CASE(ChainParams_TESTNET4_sanity)
{
sanity_check_chainparams(*m_node.args, ChainType::TESTNET4);
}
BOOST_AUTO_TEST_CASE(ChainParams_SIGNET_sanity)
{
sanity_check_chainparams(*m_node.args, ChainType::SIGNET);
}
BOOST_AUTO_TEST_SUITE_END()
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