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4f74c59334
There are no changes to behavior. Changes in this commit are all additions, and are easiest to review using "git diff -U0 --word-diff-regex=." options. Motivation for this change is to keep util functions with really generic names like "Split" and "Join" out of the global namespace so it is easier to see where these functions are defined, and so they don't interfere with function overloading, especially since the util library is a dependency of the kernel library and intended to be used with external code.
80 lines
2.1 KiB
C++
80 lines
2.1 KiB
C++
// Copyright (c) 2017-2022 The Bitcoin Core developers
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// Distributed under the MIT software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#include <boost/test/unit_test.hpp>
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#include <chain.h>
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#include <rpc/blockchain.h>
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#include <test/util/setup_common.h>
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#include <util/string.h>
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#include <cstdlib>
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using util::ToString;
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/* Equality between doubles is imprecise. Comparison should be done
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* with a small threshold of tolerance, rather than exact equality.
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*/
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static bool DoubleEquals(double a, double b, double epsilon)
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{
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return std::abs(a - b) < epsilon;
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}
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static CBlockIndex* CreateBlockIndexWithNbits(uint32_t nbits)
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{
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CBlockIndex* block_index = new CBlockIndex();
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block_index->nHeight = 46367;
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block_index->nTime = 1269211443;
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block_index->nBits = nbits;
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return block_index;
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}
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static void RejectDifficultyMismatch(double difficulty, double expected_difficulty) {
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BOOST_CHECK_MESSAGE(
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DoubleEquals(difficulty, expected_difficulty, 0.00001),
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"Difficulty was " + ToString(difficulty)
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+ " but was expected to be " + ToString(expected_difficulty));
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}
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/* Given a BlockIndex with the provided nbits,
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* verify that the expected difficulty results.
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*/
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static void TestDifficulty(uint32_t nbits, double expected_difficulty)
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{
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CBlockIndex* block_index = CreateBlockIndexWithNbits(nbits);
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double difficulty = GetDifficulty(*block_index);
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delete block_index;
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RejectDifficultyMismatch(difficulty, expected_difficulty);
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}
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BOOST_FIXTURE_TEST_SUITE(blockchain_tests, BasicTestingSetup)
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BOOST_AUTO_TEST_CASE(get_difficulty_for_very_low_target)
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{
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TestDifficulty(0x1f111111, 0.000001);
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}
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BOOST_AUTO_TEST_CASE(get_difficulty_for_low_target)
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{
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TestDifficulty(0x1ef88f6f, 0.000016);
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}
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BOOST_AUTO_TEST_CASE(get_difficulty_for_mid_target)
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{
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TestDifficulty(0x1df88f6f, 0.004023);
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}
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BOOST_AUTO_TEST_CASE(get_difficulty_for_high_target)
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{
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TestDifficulty(0x1cf88f6f, 1.029916);
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}
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BOOST_AUTO_TEST_CASE(get_difficulty_for_very_high_target)
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{
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TestDifficulty(0x12345678, 5913134931067755359633408.0);
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}
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BOOST_AUTO_TEST_SUITE_END()
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