126 lines
3.5 KiB
C++
126 lines
3.5 KiB
C++
#include <boost/test/unit_test.hpp>
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#include "stdlib.h"
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#include "rpc/blockchain.cpp"
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#include "test/test_bitcoin.h"
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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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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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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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CChain CreateChainWithNbits(uint32_t nbits)
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{
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CBlockIndex* block_index = CreateBlockIndexWithNbits(nbits);
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CChain chain;
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chain.SetTip(block_index);
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return chain;
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}
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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 " + std::to_string(difficulty)
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+ " but was expected to be " + std::to_string(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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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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/* Since we are passing in block index explicitly,
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* there is no need to set up anything within the chain itself.
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*/
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CChain chain;
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double difficulty = GetDifficulty(chain, 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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// Verify that difficulty is 1.0 for an empty chain.
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BOOST_AUTO_TEST_CASE(get_difficulty_for_null_tip)
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{
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CChain chain;
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double difficulty = GetDifficulty(chain, nullptr);
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RejectDifficultyMismatch(difficulty, 1.0);
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}
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/* Verify that if difficulty is based upon the block index
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* in the chain, if no block index is explicitly specified.
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*/
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BOOST_AUTO_TEST_CASE(get_difficulty_for_null_block_index)
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{
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CChain chain = CreateChainWithNbits(0x1df88f6f);
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double difficulty = GetDifficulty(chain, nullptr);
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delete chain.Tip();
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double expected_difficulty = 0.004023;
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RejectDifficultyMismatch(difficulty, expected_difficulty);
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}
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/* Verify that difficulty is based upon the explicitly specified
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* block index rather than being taken from the provided chain,
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* when both are present.
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*/
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BOOST_AUTO_TEST_CASE(get_difficulty_for_block_index_overrides_tip)
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{
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CChain chain = CreateChainWithNbits(0x1df88f6f);
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/* This block index's nbits should be used
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* instead of the chain's when calculating difficulty.
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*/
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CBlockIndex* override_block_index = CreateBlockIndexWithNbits(0x12345678);
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double difficulty = GetDifficulty(chain, override_block_index);
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delete chain.Tip();
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delete override_block_index;
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RejectDifficultyMismatch(difficulty, 5913134931067755359633408.0);
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}
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BOOST_AUTO_TEST_SUITE_END()
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