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// Copyright (c) 2017-2020 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 <boost/test/unit_test.hpp>
#include <chain.h>
#include <rpc/blockchain.h>
#include <test/util/setup_common.h>
#include <util/string.h>
#include <cstdlib>
/* Equality between doubles is imprecise. Comparison should be done
* with a small threshold of tolerance, rather than exact equality.
*/
static bool DoubleEquals(double a, double b, double epsilon)
{
return std::abs(a - b) < epsilon;
}
static CBlockIndex* CreateBlockIndexWithNbits(uint32_t nbits)
{
CBlockIndex* block_index = new CBlockIndex();
block_index->nHeight = 46367;
block_index->nTime = 1269211443;
block_index->nBits = nbits;
return block_index;
}
static void RejectDifficultyMismatch(double difficulty, double expected_difficulty) {
BOOST_CHECK_MESSAGE(
DoubleEquals(difficulty, expected_difficulty, 0.00001),
"Difficulty was " + ToString(difficulty)
+ " but was expected to be " + ToString(expected_difficulty));
}
/* Given a BlockIndex with the provided nbits,
* verify that the expected difficulty results.
*/
static void TestDifficulty(uint32_t nbits, double expected_difficulty)
{
CBlockIndex* block_index = CreateBlockIndexWithNbits(nbits);
double difficulty = GetDifficulty(block_index);
delete block_index;
RejectDifficultyMismatch(difficulty, expected_difficulty);
}
BOOST_FIXTURE_TEST_SUITE(blockchain_tests, BasicTestingSetup)
BOOST_AUTO_TEST_CASE(get_difficulty_for_very_low_target)
{
TestDifficulty(0x1f111111, 0.000001);
}
BOOST_AUTO_TEST_CASE(get_difficulty_for_low_target)
{
TestDifficulty(0x1ef88f6f, 0.000016);
}
BOOST_AUTO_TEST_CASE(get_difficulty_for_mid_target)
{
TestDifficulty(0x1df88f6f, 0.004023);
}
BOOST_AUTO_TEST_CASE(get_difficulty_for_high_target)
{
TestDifficulty(0x1cf88f6f, 1.029916);
}
BOOST_AUTO_TEST_CASE(get_difficulty_for_very_high_target)
{
TestDifficulty(0x12345678, 5913134931067755359633408.0);
}
BOOST_AUTO_TEST_SUITE_END()
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