src/test/pow_tests.cpp

   1 // Copyright (c) 2015 The Bitcoin Core developers
   2 // Distributed under the MIT/X11 software license, see the accompanying
   3 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
   4
   5 #include "chain.h"
   6 #include "chainparams.h"
   7 #include "pow.h"
   8 #include "random.h"
   9 #include "util.h"
  10 #include "test/test_bitcoin.h"
  11
  12 #include <boost/test/unit_test.hpp>
  13
  14 BOOST_FIXTURE_TEST_SUITE(pow_tests, BasicTestingSetup)
  15
  16 /* Test calculation of next difficulty target with no constraints applying */
  17 BOOST_AUTO_TEST_CASE(get_next_work)
  18 {
  19     const auto chainParams = CreateChainParams(CBaseChainParams::MAIN);
  20     int64_t nLastRetargetTime = 1261130161; // Block #30240
  21     CBlockIndex pindexLast;
  22     pindexLast.nHeight = 32255;
  23     pindexLast.nTime = 1262152739;  // Block #32255
  24     pindexLast.nBits = 0x1d00ffff;
  25     BOOST_CHECK_EQUAL(CalculateNextWorkRequired(&pindexLast, nLastRetargetTime, chainParams->GetConsensus()), 0x1d00d86a);
  26 }
  27
  28 /* Test the constraint on the upper bound for next work */
  29 BOOST_AUTO_TEST_CASE(get_next_work_pow_limit)
  30 {
  31     const auto chainParams = CreateChainParams(CBaseChainParams::MAIN);
  32     int64_t nLastRetargetTime = 1231006505; // Block #0
  33     CBlockIndex pindexLast;
  34     pindexLast.nHeight = 2015;
  35     pindexLast.nTime = 1233061996;  // Block #2015
  36     pindexLast.nBits = 0x1d00ffff;
  37     BOOST_CHECK_EQUAL(CalculateNextWorkRequired(&pindexLast, nLastRetargetTime, chainParams->GetConsensus()), 0x1d00ffff);
  38 }
  39
  40 /* Test the constraint on the lower bound for actual time taken */
  41 BOOST_AUTO_TEST_CASE(get_next_work_lower_limit_actual)
  42 {
  43     const auto chainParams = CreateChainParams(CBaseChainParams::MAIN);
  44     int64_t nLastRetargetTime = 1279008237; // Block #66528
  45     CBlockIndex pindexLast;
  46     pindexLast.nHeight = 68543;
  47     pindexLast.nTime = 1279297671;  // Block #68543
  48     pindexLast.nBits = 0x1c05a3f4;
  49     BOOST_CHECK_EQUAL(CalculateNextWorkRequired(&pindexLast, nLastRetargetTime, chainParams->GetConsensus()), 0x1c0168fd);
  50 }
  51
  52 /* Test the constraint on the upper bound for actual time taken */
  53 BOOST_AUTO_TEST_CASE(get_next_work_upper_limit_actual)
  54 {
  55     const auto chainParams = CreateChainParams(CBaseChainParams::MAIN);
  56     int64_t nLastRetargetTime = 1263163443; // NOTE: Not an actual block time
  57     CBlockIndex pindexLast;
  58     pindexLast.nHeight = 46367;
  59     pindexLast.nTime = 1269211443;  // Block #46367
  60     pindexLast.nBits = 0x1c387f6f;
  61     BOOST_CHECK_EQUAL(CalculateNextWorkRequired(&pindexLast, nLastRetargetTime, chainParams->GetConsensus()), 0x1d00e1fd);
  62 }
  63
  64 BOOST_AUTO_TEST_CASE(GetBlockProofEquivalentTime_test)
  65 {
  66     const auto chainParams = CreateChainParams(CBaseChainParams::MAIN);
  67     std::vector<CBlockIndex> blocks(10000);
  68     for (int i = 0; i < 10000; i++) {
  69         blocks[i].pprev = i ? &blocks[i - 1] : nullptr;
  70         blocks[i].nHeight = i;
  71         blocks[i].nTime = 1269211443 + i * chainParams->GetConsensus().nPowTargetSpacing;
  72         blocks[i].nBits = 0x207fffff; /* target 0x7fffff000... */
  73         blocks[i].nChainWork = i ? blocks[i - 1].nChainWork + GetBlockProof(blocks[i - 1]) : arith_uint256(0);
  74     }
  75
  76     for (int j = 0; j < 1000; j++) {
  77         CBlockIndex *p1 = &blocks[InsecureRandRange(10000)];
  78         CBlockIndex *p2 = &blocks[InsecureRandRange(10000)];
  79         CBlockIndex *p3 = &blocks[InsecureRandRange(10000)];
  80
  81         int64_t tdiff = GetBlockProofEquivalentTime(*p1, *p2, *p3, chainParams->GetConsensus());
  82         BOOST_CHECK_EQUAL(tdiff, p1->GetBlockTime() - p2->GetBlockTime());
  83     }
  84 }
  85
  86 BOOST_AUTO_TEST_SUITE_END()