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104 lines
4.1 KiB
C++
104 lines
4.1 KiB
C++
// Copyright (c) 2014-2015 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 "chain.h"
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#include "util.h"
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#include "test/test_dash.h"
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#include "test/test_random.h"
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#include <vector>
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#include <boost/test/unit_test.hpp>
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#define SKIPLIST_LENGTH 300000
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BOOST_FIXTURE_TEST_SUITE(skiplist_tests, BasicTestingSetup)
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BOOST_AUTO_TEST_CASE(skiplist_test)
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{
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std::vector<CBlockIndex> vIndex(SKIPLIST_LENGTH);
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for (int i=0; i<SKIPLIST_LENGTH; i++) {
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vIndex[i].nHeight = i;
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vIndex[i].pprev = (i == 0) ? NULL : &vIndex[i - 1];
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vIndex[i].BuildSkip();
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}
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for (int i=0; i<SKIPLIST_LENGTH; i++) {
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if (i > 0) {
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BOOST_CHECK(vIndex[i].pskip == &vIndex[vIndex[i].pskip->nHeight]);
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BOOST_CHECK(vIndex[i].pskip->nHeight < i);
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} else {
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BOOST_CHECK(vIndex[i].pskip == NULL);
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}
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}
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for (int i=0; i < 1000; i++) {
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int from = insecure_rand() % (SKIPLIST_LENGTH - 1);
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int to = insecure_rand() % (from + 1);
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BOOST_CHECK(vIndex[SKIPLIST_LENGTH - 1].GetAncestor(from) == &vIndex[from]);
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BOOST_CHECK(vIndex[from].GetAncestor(to) == &vIndex[to]);
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BOOST_CHECK(vIndex[from].GetAncestor(0) == &vIndex[0]);
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}
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}
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BOOST_AUTO_TEST_CASE(getlocator_test)
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{
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// Build a main chain 100000 blocks long.
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std::vector<uint256> vHashMain(100000);
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std::vector<CBlockIndex> vBlocksMain(100000);
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for (unsigned int i=0; i<vBlocksMain.size(); i++) {
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vHashMain[i] = ArithToUint256(i); // Set the hash equal to the height, so we can quickly check the distances.
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vBlocksMain[i].nHeight = i;
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vBlocksMain[i].pprev = i ? &vBlocksMain[i - 1] : NULL;
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vBlocksMain[i].phashBlock = &vHashMain[i];
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vBlocksMain[i].BuildSkip();
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BOOST_CHECK_EQUAL((int)UintToArith256(vBlocksMain[i].GetBlockHash()).GetLow64(), vBlocksMain[i].nHeight);
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BOOST_CHECK(vBlocksMain[i].pprev == NULL || vBlocksMain[i].nHeight == vBlocksMain[i].pprev->nHeight + 1);
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}
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// Build a branch that splits off at block 49999, 50000 blocks long.
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std::vector<uint256> vHashSide(50000);
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std::vector<CBlockIndex> vBlocksSide(50000);
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for (unsigned int i=0; i<vBlocksSide.size(); i++) {
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vHashSide[i] = ArithToUint256(i + 50000 + (arith_uint256(1) << 128)); // Add 1<<128 to the hashes, so GetLow64() still returns the height.
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vBlocksSide[i].nHeight = i + 50000;
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vBlocksSide[i].pprev = i ? &vBlocksSide[i - 1] : &vBlocksMain[49999];
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vBlocksSide[i].phashBlock = &vHashSide[i];
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vBlocksSide[i].BuildSkip();
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BOOST_CHECK_EQUAL((int)UintToArith256(vBlocksSide[i].GetBlockHash()).GetLow64(), vBlocksSide[i].nHeight);
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BOOST_CHECK(vBlocksSide[i].pprev == NULL || vBlocksSide[i].nHeight == vBlocksSide[i].pprev->nHeight + 1);
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}
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// Build a CChain for the main branch.
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CChain chain;
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chain.SetTip(&vBlocksMain.back());
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// Test 100 random starting points for locators.
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for (int n=0; n<100; n++) {
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int r = insecure_rand() % 150000;
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CBlockIndex* tip = (r < 100000) ? &vBlocksMain[r] : &vBlocksSide[r - 100000];
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CBlockLocator locator = chain.GetLocator(tip);
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// The first result must be the block itself, the last one must be genesis.
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BOOST_CHECK(locator.vHave.front() == tip->GetBlockHash());
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BOOST_CHECK(locator.vHave.back() == vBlocksMain[0].GetBlockHash());
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// Entries 1 through 11 (inclusive) go back one step each.
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for (unsigned int i = 1; i < 12 && i < locator.vHave.size() - 1; i++) {
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BOOST_CHECK_EQUAL(UintToArith256(locator.vHave[i]).GetLow64(), tip->nHeight - i);
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}
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// The further ones (excluding the last one) go back with exponential steps.
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unsigned int dist = 2;
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for (unsigned int i = 12; i < locator.vHave.size() - 1; i++) {
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BOOST_CHECK_EQUAL(UintToArith256(locator.vHave[i - 1]).GetLow64() - UintToArith256(locator.vHave[i]).GetLow64(), dist);
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dist *= 2;
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}
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}
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}
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BOOST_AUTO_TEST_SUITE_END()
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