Function BOOST_AUTO_TEST_CASE

src/test/validation_chainstate_tests.cpp:23–78

//! Test resizing coins-related CChainState caches during runtime.
//!
BOOST_AUTO_TEST_CASE(validation_chainstate_resize_caches)
{
    ChainstateManager manager;
    WITH_LOCK(::cs_main, manager.m_blockman.m_block_tree_db = std::make_unique<CBlockTreeDB>(1 << 20, true));
    CTxMemPool mempool;

    //! Create and add a Coin with DynamicMemoryUsage of 80 bytes to the given view.
    auto add_coin = [](CCoinsViewCache& coins_view) -> COutPoint {
        Coin newcoin;
        uint256 txid = InsecureRand256();
        COutPoint outp{txid, 0};
        newcoin.nHeight = 1;
        newcoin.out.nValue = InsecureRand32();
        newcoin.out.scriptPubKey.assign((uint32_t)56, 1);
        coins_view.AddCoin(outp, std::move(newcoin), false);

        return outp;
    };

    CChainState& c1 = WITH_LOCK(cs_main, return manager.InitializeChainstate(&mempool));
    c1.InitCoinsDB(
        /*cache_size_bytes=*/1 << 23, /*in_memory=*/true, /*should_wipe=*/false);
    WITH_LOCK(::cs_main, c1.InitCoinsCache(1 << 23));
    BOOST_REQUIRE(c1.LoadGenesisBlock()); // Need at least one block loaded to be able to flush caches

    // Add a coin to the in-memory cache, upsize once, then downsize.
    {
        LOCK(::cs_main);
        auto outpoint = add_coin(c1.CoinsTip());

        // Set a meaningless bestblock value in the coinsview cache - otherwise we won't
        // flush during ResizecoinsCaches() and will subsequently hit an assertion.
        c1.CoinsTip().SetBestBlock(InsecureRand256());

        BOOST_CHECK(c1.CoinsTip().HaveCoinInCache(outpoint));

        c1.ResizeCoinsCaches(
            1 << 24,  // upsizing the coinsview cache
            1 << 22  // downsizing the coinsdb cache
        );

        // View should still have the coin cached, since we haven't destructed the cache on upsize.
        BOOST_CHECK(c1.CoinsTip().HaveCoinInCache(outpoint));

        c1.ResizeCoinsCaches(
            1 << 22,  // downsizing the coinsview cache
            1 << 23  // upsizing the coinsdb cache
        );

        // The view cache should be empty since we had to destruct to downsize.
        BOOST_CHECK(!c1.CoinsTip().HaveCoinInCache(outpoint));
    }

    // Avoid triggering the address sanitizer.
    WITH_LOCK(::cs_main, manager.Unload());
}

//! Test UpdateTip behavior for both active and background chainstates.