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#       1                 :            : // Copyright (c) 2017-2020 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 <boost/test/unit_test.hpp>
#       6                 :            : 
#       7                 :            : #include <stdlib.h>
#       8                 :            : 
#       9                 :            : #include <chain.h>
#      10                 :            : #include <rpc/blockchain.h>
#      11                 :            : #include <test/util/setup_common.h>
#      12                 :            : #include <util/string.h>
#      13                 :            : 
#      14                 :            : /* Equality between doubles is imprecise. Comparison should be done
#      15                 :            :  * with a small threshold of tolerance, rather than exact equality.
#      16                 :            :  */
#      17                 :            : static bool DoubleEquals(double a, double b, double epsilon)
#      18                 :         10 : {
#      19                 :         10 :     return std::abs(a - b) < epsilon;
#      20                 :         10 : }
#      21                 :            : 
#      22                 :            : static CBlockIndex* CreateBlockIndexWithNbits(uint32_t nbits)
#      23                 :         10 : {
#      24                 :         10 :     CBlockIndex* block_index = new CBlockIndex();
#      25                 :         10 :     block_index->nHeight = 46367;
#      26                 :         10 :     block_index->nTime = 1269211443;
#      27                 :         10 :     block_index->nBits = nbits;
#      28                 :         10 :     return block_index;
#      29                 :         10 : }
#      30                 :            : 
#      31                 :         10 : static void RejectDifficultyMismatch(double difficulty, double expected_difficulty) {
#      32                 :         10 :      BOOST_CHECK_MESSAGE(
#      33                 :         10 :         DoubleEquals(difficulty, expected_difficulty, 0.00001),
#      34                 :         10 :         "Difficulty was " + ToString(difficulty)
#      35                 :         10 :             + " but was expected to be " + ToString(expected_difficulty));
#      36                 :         10 : }
#      37                 :            : 
#      38                 :            : /* Given a BlockIndex with the provided nbits,
#      39                 :            :  * verify that the expected difficulty results.
#      40                 :            :  */
#      41                 :            : static void TestDifficulty(uint32_t nbits, double expected_difficulty)
#      42                 :         10 : {
#      43                 :         10 :     CBlockIndex* block_index = CreateBlockIndexWithNbits(nbits);
#      44                 :         10 :     double difficulty = GetDifficulty(block_index);
#      45                 :         10 :     delete block_index;
#      46                 :            : 
#      47                 :         10 :     RejectDifficultyMismatch(difficulty, expected_difficulty);
#      48                 :         10 : }
#      49                 :            : 
#      50                 :            : BOOST_FIXTURE_TEST_SUITE(blockchain_tests, BasicTestingSetup)
#      51                 :            : 
#      52                 :            : BOOST_AUTO_TEST_CASE(get_difficulty_for_very_low_target)
#      53                 :          2 : {
#      54                 :          2 :     TestDifficulty(0x1f111111, 0.000001);
#      55                 :          2 : }
#      56                 :            : 
#      57                 :            : BOOST_AUTO_TEST_CASE(get_difficulty_for_low_target)
#      58                 :          2 : {
#      59                 :          2 :     TestDifficulty(0x1ef88f6f, 0.000016);
#      60                 :          2 : }
#      61                 :            : 
#      62                 :            : BOOST_AUTO_TEST_CASE(get_difficulty_for_mid_target)
#      63                 :          2 : {
#      64                 :          2 :     TestDifficulty(0x1df88f6f, 0.004023);
#      65                 :          2 : }
#      66                 :            : 
#      67                 :            : BOOST_AUTO_TEST_CASE(get_difficulty_for_high_target)
#      68                 :          2 : {
#      69                 :          2 :     TestDifficulty(0x1cf88f6f, 1.029916);
#      70                 :          2 : }
#      71                 :            : 
#      72                 :            : BOOST_AUTO_TEST_CASE(get_difficulty_for_very_high_target)
#      73                 :          2 : {
#      74                 :          2 :     TestDifficulty(0x12345678, 5913134931067755359633408.0);
#      75                 :          2 : }
#      76                 :            : 
#      77                 :            : BOOST_AUTO_TEST_SUITE_END()