Differential D3012 Diff 8981 src/test/blockchain_tests.cpp

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src/test/blockchain_tests.cpp

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				#include <rpc/blockchain.h>

				#include <chain.h>

				#include <test/test_bitcoin.h>

				#include <boost/test/unit_test.hpp>

				#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 " + std::to_string(difficulty) +
				" but was expected to be " +
				std::to_string(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()