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     SelectParams(CBaseChainParams::MAIN);
  20     const Consensus::Params& params = Params().GetConsensus();
  21
  22     int64_t nLastRetargetTime = 1261130161; // Block #30240
  23     CBlockIndex pindexLast;
  24     pindexLast.nHeight = 32255;
  25     pindexLast.nTime = 1262152739;  // Block #32255
  26     pindexLast.nBits = 0x1d00ffff;
  27     BOOST_CHECK_EQUAL(CalculateNextWorkRequired(&pindexLast, nLastRetargetTime, params), 0x1d00d86a);
  28 }
  29
  30 /* Test the constraint on the upper bound for next work */
  31 BOOST_AUTO_TEST_CASE(get_next_work_pow_limit)
  32 {
  33     SelectParams(CBaseChainParams::MAIN);
  34     const Consensus::Params& params = Params().GetConsensus();
  35
  36     int64_t nLastRetargetTime = 1231006505; // Block #0
  37     CBlockIndex pindexLast;
  38     pindexLast.nHeight = 2015;
  39     pindexLast.nTime = 1233061996;  // Block #2015
  40     pindexLast.nBits = 0x1d00ffff;
  41     BOOST_CHECK_EQUAL(CalculateNextWorkRequired(&pindexLast, nLastRetargetTime, params), 0x1d00ffff);
  42 }
  43
  44 /* Test the constraint on the lower bound for actual time taken */
  45 BOOST_AUTO_TEST_CASE(get_next_work_lower_limit_actual)
  46 {
  47     SelectParams(CBaseChainParams::MAIN);
  48     const Consensus::Params& params = Params().GetConsensus();
  49
  50     int64_t nLastRetargetTime = 1279008237; // Block #66528
  51     CBlockIndex pindexLast;
  52     pindexLast.nHeight = 68543;
  53     pindexLast.nTime = 1279297671;  // Block #68543
  54     pindexLast.nBits = 0x1c05a3f4;
  55     BOOST_CHECK_EQUAL(CalculateNextWorkRequired(&pindexLast, nLastRetargetTime, params), 0x1c0168fd);
  56 }
  57
  58 /* Test the constraint on the upper bound for actual time taken */
  59 BOOST_AUTO_TEST_CASE(get_next_work_upper_limit_actual)
  60 {
  61     SelectParams(CBaseChainParams::MAIN);
  62     const Consensus::Params& params = Params().GetConsensus();
  63
  64     int64_t nLastRetargetTime = 1263163443; // NOTE: Not an actual block time
  65     CBlockIndex pindexLast;
  66     pindexLast.nHeight = 46367;
  67     pindexLast.nTime = 1269211443;  // Block #46367
  68     pindexLast.nBits = 0x1c387f6f;
  69     BOOST_CHECK_EQUAL(CalculateNextWorkRequired(&pindexLast, nLastRetargetTime, params), 0x1d00e1fd);
  70 }
  71
  72 BOOST_AUTO_TEST_CASE(GetBlockProofEquivalentTime_test)
  73 {
  74     SelectParams(CBaseChainParams::MAIN);
  75     const Consensus::Params& params = Params().GetConsensus();
  76
  77     std::vector<CBlockIndex> blocks(10000);
  78     for (int i = 0; i < 10000; i++) {
  79         blocks[i].pprev = i ? &blocks[i - 1] : NULL;
  80         blocks[i].nHeight = i;
  81         blocks[i].nTime = 1269211443 + i * params.nPowTargetSpacing;
  82         blocks[i].nBits = 0x207fffff; /* target 0x7fffff000... */
  83         blocks[i].nChainWork = i ? blocks[i - 1].nChainWork + GetBlockProof(blocks[i - 1]) : arith_uint256(0);
  84     }
  85
  86     for (int j = 0; j < 1000; j++) {
  87         CBlockIndex *p1 = &blocks[GetRand(10000)];
  88         CBlockIndex *p2 = &blocks[GetRand(10000)];
  89         CBlockIndex *p3 = &blocks[GetRand(10000)];
  90
  91         int64_t tdiff = GetBlockProofEquivalentTime(*p1, *p2, *p3, params);
  92         BOOST_CHECK_EQUAL(tdiff, p1->GetBlockTime() - p2->GetBlockTime());
  93     }
  94 }
  95
  96 BOOST_AUTO_TEST_SUITE_END()