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Diffstat (limited to 'src/test/coins_tests.cpp')
| -rw-r--r-- | src/test/coins_tests.cpp | 178 |
1 files changed, 178 insertions, 0 deletions
diff --git a/src/test/coins_tests.cpp b/src/test/coins_tests.cpp new file mode 100644 index 0000000000..3ecd301bc7 --- /dev/null +++ b/src/test/coins_tests.cpp @@ -0,0 +1,178 @@ +// Copyright (c) 2014 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 "coins.h" +#include "random.h" +#include "uint256.h" + +#include <vector> +#include <map> + +#include <boost/test/unit_test.hpp> + +namespace +{ +class CCoinsViewTest : public CCoinsView +{ + uint256 hashBestBlock_; + std::map<uint256, CCoins> map_; + +public: + bool GetCoins(const uint256& txid, CCoins& coins) const + { + std::map<uint256, CCoins>::const_iterator it = map_.find(txid); + if (it == map_.end()) { + return false; + } + coins = it->second; + if (coins.IsPruned() && insecure_rand() % 2 == 0) { + // Randomly return false in case of an empty entry. + return false; + } + return true; + } + + bool HaveCoins(const uint256& txid) const + { + CCoins coins; + return GetCoins(txid, coins); + } + + uint256 GetBestBlock() const { return hashBestBlock_; } + + bool BatchWrite(CCoinsMap& mapCoins, const uint256& hashBlock) + { + for (CCoinsMap::iterator it = mapCoins.begin(); it != mapCoins.end(); ) { + map_[it->first] = it->second.coins; + if (it->second.coins.IsPruned() && insecure_rand() % 3 == 0) { + // Randomly delete empty entries on write. + map_.erase(it->first); + } + mapCoins.erase(it++); + } + mapCoins.clear(); + hashBestBlock_ = hashBlock; + return true; + } + + bool GetStats(CCoinsStats& stats) const { return false; } +}; +} + +BOOST_AUTO_TEST_SUITE(coins_tests) + +static const unsigned int NUM_SIMULATION_ITERATIONS = 40000; + +// This is a large randomized insert/remove simulation test on a variable-size +// stack of caches on top of CCoinsViewTest. +// +// It will randomly create/update/delete CCoins entries to a tip of caches, with +// txids picked from a limited list of random 256-bit hashes. Occasionally, a +// new tip is added to the stack of caches, or the tip is flushed and removed. +// +// During the process, booleans are kept to make sure that the randomized +// operation hits all branches. +BOOST_AUTO_TEST_CASE(coins_cache_simulation_test) +{ + // Various coverage trackers. + bool removed_all_caches = false; + bool reached_4_caches = false; + bool added_an_entry = false; + bool removed_an_entry = false; + bool updated_an_entry = false; + bool found_an_entry = false; + bool missed_an_entry = false; + + // A simple map to track what we expect the cache stack to represent. + std::map<uint256, CCoins> result; + + // The cache stack. + CCoinsViewTest base; // A CCoinsViewTest at the bottom. + std::vector<CCoinsViewCache*> stack; // A stack of CCoinsViewCaches on top. + stack.push_back(new CCoinsViewCache(&base)); // Start with one cache. + + // Use a limited set of random transaction ids, so we do test overwriting entries. + std::vector<uint256> txids; + txids.resize(NUM_SIMULATION_ITERATIONS / 8); + for (unsigned int i = 0; i < txids.size(); i++) { + txids[i] = GetRandHash(); + } + + for (unsigned int i = 0; i < NUM_SIMULATION_ITERATIONS; i++) { + // Do a random modification. + { + uint256 txid = txids[insecure_rand() % txids.size()]; // txid we're going to modify in this iteration. + CCoins& coins = result[txid]; + CCoinsModifier entry = stack.back()->ModifyCoins(txid); + BOOST_CHECK(coins == *entry); + if (insecure_rand() % 5 == 0 || coins.IsPruned()) { + if (coins.IsPruned()) { + added_an_entry = true; + } else { + updated_an_entry = true; + } + coins.nVersion = insecure_rand(); + coins.vout.resize(1); + coins.vout[0].nValue = insecure_rand(); + *entry = coins; + } else { + coins.Clear(); + entry->Clear(); + removed_an_entry = true; + } + } + + // Once every 1000 iterations and at the end, verify the full cache. + if (insecure_rand() % 1000 == 1 || i == NUM_SIMULATION_ITERATIONS - 1) { + for (std::map<uint256, CCoins>::iterator it = result.begin(); it != result.end(); it++) { + const CCoins* coins = stack.back()->AccessCoins(it->first); + if (coins) { + BOOST_CHECK(*coins == it->second); + found_an_entry = true; + } else { + BOOST_CHECK(it->second.IsPruned()); + missed_an_entry = true; + } + } + } + + if (insecure_rand() % 100 == 0) { + // Every 100 iterations, change the cache stack. + if (stack.size() > 0 && insecure_rand() % 2 == 0) { + stack.back()->Flush(); + delete stack.back(); + stack.pop_back(); + } + if (stack.size() == 0 || (stack.size() < 4 && insecure_rand() % 2)) { + CCoinsView* tip = &base; + if (stack.size() > 0) { + tip = stack.back(); + } else { + removed_all_caches = true; + } + stack.push_back(new CCoinsViewCache(tip)); + if (stack.size() == 4) { + reached_4_caches = true; + } + } + } + } + + // Clean up the stack. + while (stack.size() > 0) { + delete stack.back(); + stack.pop_back(); + } + + // Verify coverage. + BOOST_CHECK(removed_all_caches); + BOOST_CHECK(reached_4_caches); + BOOST_CHECK(added_an_entry); + BOOST_CHECK(removed_an_entry); + BOOST_CHECK(updated_an_entry); + BOOST_CHECK(found_an_entry); + BOOST_CHECK(missed_an_entry); +} + +BOOST_AUTO_TEST_SUITE_END() |