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 using namespace std;
  15
  16 BOOST_FIXTURE_TEST_SUITE(pow_tests, BasicTestingSetup)
  17
  18 /* Test calculation of next difficulty target with no constraints applying */
  19 BOOST_AUTO_TEST_CASE(get_next_work)
  20 {
  21     SelectParams(CBaseChainParams::MAIN);
  22     const Consensus::Params& params = Params().GetConsensus();
  23
  24     int64_t nLastRetargetTime = 1261130161; // Block #30240
  25     CBlockIndex pindexLast;
  26     pindexLast.nHeight = 32255;
  27     pindexLast.nTime = 1262152739;  // Block #32255
  28     pindexLast.nBits = 0x1d00ffff;
  29     BOOST_CHECK_EQUAL(CalculateNextWorkRequired(&pindexLast, nLastRetargetTime, params), 0x1d00d86a);
  30 }
  31
  32 /* Test the constraint on the upper bound for next work */
  33 BOOST_AUTO_TEST_CASE(get_next_work_pow_limit)
  34 {
  35     SelectParams(CBaseChainParams::MAIN);
  36     const Consensus::Params& params = Params().GetConsensus();
  37
  38     int64_t nLastRetargetTime = 1231006505; // Block #0
  39     CBlockIndex pindexLast;
  40     pindexLast.nHeight = 2015;
  41     pindexLast.nTime = 1233061996;  // Block #2015
  42     pindexLast.nBits = 0x1d00ffff;
  43     BOOST_CHECK_EQUAL(CalculateNextWorkRequired(&pindexLast, nLastRetargetTime, params), 0x1d00ffff);
  44 }
  45
  46 /* Test the constraint on the lower bound for actual time taken */
  47 BOOST_AUTO_TEST_CASE(get_next_work_lower_limit_actual)
  48 {
  49     SelectParams(CBaseChainParams::MAIN);
  50     const Consensus::Params& params = Params().GetConsensus();
  51
  52     int64_t nLastRetargetTime = 1279008237; // Block #66528
  53     CBlockIndex pindexLast;
  54     pindexLast.nHeight = 68543;
  55     pindexLast.nTime = 1279297671;  // Block #68543
  56     pindexLast.nBits = 0x1c05a3f4;
  57     BOOST_CHECK_EQUAL(CalculateNextWorkRequired(&pindexLast, nLastRetargetTime, params), 0x1c0168fd);
  58 }
  59
  60 /* Test the constraint on the upper bound for actual time taken */
  61 BOOST_AUTO_TEST_CASE(get_next_work_upper_limit_actual)
  62 {
  63     SelectParams(CBaseChainParams::MAIN);
  64     const Consensus::Params& params = Params().GetConsensus();
  65
  66     int64_t nLastRetargetTime = 1263163443; // NOTE: Not an actual block time
  67     CBlockIndex pindexLast;
  68     pindexLast.nHeight = 46367;
  69     pindexLast.nTime = 1269211443;  // Block #46367
  70     pindexLast.nBits = 0x1c387f6f;
  71     BOOST_CHECK_EQUAL(CalculateNextWorkRequired(&pindexLast, nLastRetargetTime, params), 0x1d00e1fd);
  72 }
  73
  74 BOOST_AUTO_TEST_CASE(GetBlockProofEquivalentTime_test)
  75 {
  76     SelectParams(CBaseChainParams::MAIN);
  77     const Consensus::Params& params = Params().GetConsensus();
  78
  79     std::vector<CBlockIndex> blocks(10000);
  80     for (int i = 0; i < 10000; i++) {
  81         blocks[i].pprev = i ? &blocks[i - 1] : NULL;
  82         blocks[i].nHeight = i;
  83         blocks[i].nTime = 1269211443 + i * params.nPowTargetSpacing;
  84         blocks[i].nBits = 0x207fffff; /* target 0x7fffff000... */
  85         blocks[i].nChainWork = i ? blocks[i - 1].nChainWork + GetBlockProof(blocks[i - 1]) : arith_uint256(0);
  86     }
  87
  88     for (int j = 0; j < 1000; j++) {
  89         CBlockIndex *p1 = &blocks[GetRand(10000)];
  90         CBlockIndex *p2 = &blocks[GetRand(10000)];
  91         CBlockIndex *p3 = &blocks[GetRand(10000)];
  92
  93         int64_t tdiff = GetBlockProofEquivalentTime(*p1, *p2, *p3, params);
  94         BOOST_CHECK_EQUAL(tdiff, p1->GetBlockTime() - p2->GetBlockTime());
  95     }
  96 }
  97
  98 BOOST_AUTO_TEST_SUITE_END()