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-rw-r--r--src/db.cpp53
-rw-r--r--src/db.h3
-rw-r--r--src/main.cpp52
-rw-r--r--src/main.h5
-rw-r--r--src/test/miner_tests.cpp190
-rw-r--r--src/test/test_bitcoin.cpp8
6 files changed, 293 insertions, 18 deletions
diff --git a/src/db.cpp b/src/db.cpp
index e494d28e3c..5671993d37 100644
--- a/src/db.cpp
+++ b/src/db.cpp
@@ -42,7 +42,8 @@ void CDBEnv::EnvShutdown()
{
printf("EnvShutdown exception: %s (%d)\n", e.what(), e.get_errno());
}
- DbEnv(0).remove(GetDataDir().string().c_str(), 0);
+ if (!fMockDb)
+ DbEnv(0).remove(GetDataDir().string().c_str(), 0);
}
CDBEnv::CDBEnv() : dbenv(0)
@@ -103,12 +104,48 @@ bool CDBEnv::Open(boost::filesystem::path pathEnv_)
return error("CDB() : error %d opening database environment", ret);
fDbEnvInit = true;
+ fMockDb = false;
return true;
}
+void CDBEnv::MakeMock()
+{
+ if (fDbEnvInit)
+ throw runtime_error("CDBEnv::MakeMock(): already initialized");
+
+ if (fShutdown)
+ throw runtime_error("CDBEnv::MakeMock(): during shutdown");
+
+ printf("CDBEnv::MakeMock()\n");
+
+ dbenv.set_cachesize(1, 0, 1);
+ dbenv.set_lg_bsize(10485760*4);
+ dbenv.set_lg_max(10485760);
+ dbenv.set_lk_max_locks(10000);
+ dbenv.set_lk_max_objects(10000);
+ dbenv.set_flags(DB_AUTO_COMMIT, 1);
+ dbenv.log_set_config(DB_LOG_IN_MEMORY, 1);
+ int ret = dbenv.open(NULL,
+ DB_CREATE |
+ DB_INIT_LOCK |
+ DB_INIT_LOG |
+ DB_INIT_MPOOL |
+ DB_INIT_TXN |
+ DB_THREAD |
+ DB_PRIVATE,
+ S_IRUSR | S_IWUSR);
+ if (ret > 0)
+ throw runtime_error(strprintf("CDBEnv::MakeMock(): error %d opening database environment", ret));
+
+ fDbEnvInit = true;
+ fMockDb = true;
+}
+
void CDBEnv::CheckpointLSN(std::string strFile)
{
dbenv.txn_checkpoint(0, 0, 0);
+ if (fMockDb)
+ return;
dbenv.lsn_reset(strFile.c_str(), 0);
}
@@ -138,8 +175,17 @@ CDB::CDB(const char *pszFile, const char* pszMode) :
{
pdb = new Db(&bitdb.dbenv, 0);
+ bool fMockDb = bitdb.IsMock();
+ if (fMockDb)
+ {
+ DbMpoolFile*mpf = pdb->get_mpf();
+ ret = mpf->set_flags(DB_MPOOL_NOFILE, 1);
+ if (ret != 0)
+ throw runtime_error(strprintf("CDB() : failed to configure for no temp file backing for database %s", pszFile));
+ }
+
ret = pdb->open(NULL, // Txn pointer
- pszFile, // Filename
+ fMockDb ? NULL : pszFile, // Filename
"main", // Logical db name
DB_BTREE, // Database type
nFlags, // Flags
@@ -337,7 +383,8 @@ void CDBEnv::Flush(bool fShutdown)
dbenv.txn_checkpoint(0, 0, 0);
if (!IsChainFile(strFile) || fDetachDB) {
printf("%s detach\n", strFile.c_str());
- dbenv.lsn_reset(strFile.c_str(), 0);
+ if (!fMockDb)
+ dbenv.lsn_reset(strFile.c_str(), 0);
}
printf("%s closed\n", strFile.c_str());
mapFileUseCount.erase(mi++);
diff --git a/src/db.h b/src/db.h
index 1030a40c48..4a08bf10a1 100644
--- a/src/db.h
+++ b/src/db.h
@@ -35,6 +35,7 @@ class CDBEnv
private:
bool fDetachDB;
bool fDbEnvInit;
+ bool fMockDb;
boost::filesystem::path pathEnv;
void EnvShutdown();
@@ -47,6 +48,8 @@ public:
CDBEnv();
~CDBEnv();
+ void MakeMock();
+ bool IsMock() { return fMockDb; };
bool Open(boost::filesystem::path pathEnv_);
void Close();
void Flush(bool fShutdown);
diff --git a/src/main.cpp b/src/main.cpp
index bc2fdb0239..14ea4ffba4 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -653,6 +653,15 @@ bool CTxMemPool::remove(CTransaction &tx)
return true;
}
+void
+CTxMemPool::clear()
+{
+ LOCK(cs);
+ mapTx.clear();
+ mapNextTx.clear();
+ ++nTransactionsUpdated;
+}
+
void CTxMemPool::queryHashes(std::vector<uint256>& vtxid)
{
vtxid.clear();
@@ -1316,10 +1325,10 @@ bool CBlock::DisconnectBlock(CTxDB& txdb, CBlockIndex* pindex)
return true;
}
-bool CBlock::ConnectBlock(CTxDB& txdb, CBlockIndex* pindex)
+bool CBlock::ConnectBlock(CTxDB& txdb, CBlockIndex* pindex, bool fJustCheck)
{
// Check it again in case a previous version let a bad block in
- if (!CheckBlock())
+ if (!CheckBlock(!fJustCheck, !fJustCheck))
return false;
// Do not allow blocks that contain transactions which 'overwrite' older transactions,
@@ -1339,7 +1348,13 @@ bool CBlock::ConnectBlock(CTxDB& txdb, CBlockIndex* pindex)
bool fStrictPayToScriptHash = (pindex->nTime >= nBIP16SwitchTime);
//// issue here: it doesn't know the version
- unsigned int nTxPos = pindex->nBlockPos + ::GetSerializeSize(CBlock(), SER_DISK, CLIENT_VERSION) - 1 + GetSizeOfCompactSize(vtx.size());
+ unsigned int nTxPos;
+ if (fJustCheck)
+ // FetchInputs treats CDiskTxPos(1,1,1) as a special "refer to memorypool" indicator
+ // Since we're just checking the block and not actually connecting it, it might not (and probably shouldn't) be on the disk to get the transaction from
+ nTxPos = 1;
+ else
+ nTxPos = pindex->nBlockPos + ::GetSerializeSize(CBlock(), SER_DISK, CLIENT_VERSION) - 1 + GetSizeOfCompactSize(vtx.size());
map<uint256, CTxIndex> mapQueuedChanges;
int64 nFees = 0;
@@ -1362,7 +1377,8 @@ bool CBlock::ConnectBlock(CTxDB& txdb, CBlockIndex* pindex)
return DoS(100, error("ConnectBlock() : too many sigops"));
CDiskTxPos posThisTx(pindex->nFile, pindex->nBlockPos, nTxPos);
- nTxPos += ::GetSerializeSize(tx, SER_DISK, CLIENT_VERSION);
+ if (!fJustCheck)
+ nTxPos += ::GetSerializeSize(tx, SER_DISK, CLIENT_VERSION);
MapPrevTx mapInputs;
if (!tx.IsCoinBase())
@@ -1390,6 +1406,12 @@ bool CBlock::ConnectBlock(CTxDB& txdb, CBlockIndex* pindex)
mapQueuedChanges[hashTx] = CTxIndex(posThisTx, tx.vout.size());
}
+ if (vtx[0].GetValueOut() > GetBlockValue(pindex->nHeight, nFees))
+ return false;
+
+ if (fJustCheck)
+ return true;
+
// Write queued txindex changes
for (map<uint256, CTxIndex>::iterator mi = mapQueuedChanges.begin(); mi != mapQueuedChanges.end(); ++mi)
{
@@ -1397,9 +1419,6 @@ bool CBlock::ConnectBlock(CTxDB& txdb, CBlockIndex* pindex)
return error("ConnectBlock() : UpdateTxIndex failed");
}
- if (vtx[0].GetValueOut() > GetBlockValue(pindex->nHeight, nFees))
- return false;
-
// Update block index on disk without changing it in memory.
// The memory index structure will be changed after the db commits.
if (pindex->pprev)
@@ -1703,7 +1722,7 @@ bool CBlock::AddToBlockIndex(unsigned int nFile, unsigned int nBlockPos)
-bool CBlock::CheckBlock() const
+bool CBlock::CheckBlock(bool fCheckPOW, bool fCheckMerkleRoot) const
{
// These are checks that are independent of context
// that can be verified before saving an orphan block.
@@ -1713,7 +1732,7 @@ bool CBlock::CheckBlock() const
return DoS(100, error("CheckBlock() : size limits failed"));
// Check proof of work matches claimed amount
- if (!CheckProofOfWork(GetHash(), nBits))
+ if (fCheckPOW && !CheckProofOfWork(GetHash(), nBits))
return DoS(50, error("CheckBlock() : proof of work failed"));
// Check timestamp
@@ -1751,7 +1770,7 @@ bool CBlock::CheckBlock() const
return DoS(100, error("CheckBlock() : out-of-bounds SigOpCount"));
// Check merkleroot
- if (hashMerkleRoot != BuildMerkleTree())
+ if (fCheckMerkleRoot && hashMerkleRoot != BuildMerkleTree())
return DoS(100, error("CheckBlock() : hashMerkleRoot mismatch"));
return true;
@@ -3312,6 +3331,9 @@ public:
uint64 nLastBlockTx = 0;
uint64 nLastBlockSize = 0;
+const char* pszDummy = "\0\0";
+CScript scriptDummy(std::vector<unsigned char>(pszDummy, pszDummy + sizeof(pszDummy)));
+
CBlock* CreateNewBlock(CReserveKey& reservekey)
{
CBlockIndex* pindexPrev = pindexBest;
@@ -3469,16 +3491,22 @@ CBlock* CreateNewBlock(CReserveKey& reservekey)
nLastBlockSize = nBlockSize;
printf("CreateNewBlock(): total size %lu\n", nBlockSize);
- }
pblock->vtx[0].vout[0].nValue = GetBlockValue(pindexPrev->nHeight+1, nFees);
// Fill in header
pblock->hashPrevBlock = pindexPrev->GetBlockHash();
- pblock->hashMerkleRoot = pblock->BuildMerkleTree();
pblock->UpdateTime(pindexPrev);
pblock->nBits = GetNextWorkRequired(pindexPrev, pblock.get());
pblock->nNonce = 0;
+ pblock->vtx[0].vin[0].scriptSig = scriptDummy;
+ CBlockIndex indexDummy(1, 1, *pblock);
+ indexDummy.pprev = pindexPrev;
+ indexDummy.nHeight = pindexPrev->nHeight + 1;
+ if (!pblock->ConnectBlock(txdb, &indexDummy, true))
+ throw std::runtime_error("CreateNewBlock() : ConnectBlock failed");
+ }
+
return pblock.release();
}
diff --git a/src/main.h b/src/main.h
index b3cc9ab40e..301badcca9 100644
--- a/src/main.h
+++ b/src/main.h
@@ -1016,11 +1016,11 @@ public:
bool DisconnectBlock(CTxDB& txdb, CBlockIndex* pindex);
- bool ConnectBlock(CTxDB& txdb, CBlockIndex* pindex);
+ bool ConnectBlock(CTxDB& txdb, CBlockIndex* pindex, bool fJustCheck=false);
bool ReadFromDisk(const CBlockIndex* pindex, bool fReadTransactions=true);
bool SetBestChain(CTxDB& txdb, CBlockIndex* pindexNew);
bool AddToBlockIndex(unsigned int nFile, unsigned int nBlockPos);
- bool CheckBlock() const;
+ bool CheckBlock(bool fCheckPOW=true, bool fCheckMerkleRoot=true) const;
bool AcceptBlock();
private:
@@ -1606,6 +1606,7 @@ public:
bool fCheckInputs, bool* pfMissingInputs);
bool addUnchecked(const uint256& hash, CTransaction &tx);
bool remove(CTransaction &tx);
+ void clear();
void queryHashes(std::vector<uint256>& vtxid);
unsigned long size()
diff --git a/src/test/miner_tests.cpp b/src/test/miner_tests.cpp
index 5712b4a1b1..3c6039541e 100644
--- a/src/test/miner_tests.cpp
+++ b/src/test/miner_tests.cpp
@@ -1,12 +1,202 @@
#include <boost/test/unit_test.hpp>
+#include "init.h"
+#include "main.h"
#include "uint256.h"
#include "util.h"
+#include "wallet.h"
extern void SHA256Transform(void* pstate, void* pinput, const void* pinit);
BOOST_AUTO_TEST_SUITE(miner_tests)
+static
+struct {
+ unsigned char extranonce;
+ unsigned int nonce;
+} blockinfo[] = {
+ {4, 0xa4a3e223}, {2, 0x15c32f9e}, {1, 0x0375b547}, {1, 0x7004a8a5},
+ {2, 0xce440296}, {2, 0x52cfe198}, {1, 0x77a72cd0}, {2, 0xbb5d6f84},
+ {2, 0x83f30c2c}, {1, 0x48a73d5b}, {1, 0xef7dcd01}, {2, 0x6809c6c4},
+ {2, 0x0883ab3c}, {1, 0x087bbbe2}, {2, 0x2104a814}, {2, 0xdffb6daa},
+ {1, 0xee8a0a08}, {2, 0xba4237c1}, {1, 0xa70349dc}, {1, 0x344722bb},
+ {3, 0xd6294733}, {2, 0xec9f5c94}, {2, 0xca2fbc28}, {1, 0x6ba4f406},
+ {2, 0x015d4532}, {1, 0x6e119b7c}, {2, 0x43e8f314}, {2, 0x27962f38},
+ {2, 0xb571b51b}, {2, 0xb36bee23}, {2, 0xd17924a8}, {2, 0x6bc212d9},
+ {1, 0x630d4948}, {2, 0x9a4c4ebb}, {2, 0x554be537}, {1, 0xd63ddfc7},
+ {2, 0xa10acc11}, {1, 0x759a8363}, {2, 0xfb73090d}, {1, 0xe82c6a34},
+ {1, 0xe33e92d7}, {3, 0x658ef5cb}, {2, 0xba32ff22}, {5, 0x0227a10c},
+ {1, 0xa9a70155}, {5, 0xd096d809}, {1, 0x37176174}, {1, 0x830b8d0f},
+ {1, 0xc6e3910e}, {2, 0x823f3ca8}, {1, 0x99850849}, {1, 0x7521fb81},
+ {1, 0xaacaabab}, {1, 0xd645a2eb}, {5, 0x7aea1781}, {5, 0x9d6e4b78},
+ {1, 0x4ce90fd8}, {1, 0xabdc832d}, {6, 0x4a34f32a}, {2, 0xf2524c1c},
+ {2, 0x1bbeb08a}, {1, 0xad47f480}, {1, 0x9f026aeb}, {1, 0x15a95049},
+ {2, 0xd1cb95b2}, {2, 0xf84bbda5}, {1, 0x0fa62cd1}, {1, 0xe05f9169},
+ {1, 0x78d194a9}, {5, 0x3e38147b}, {5, 0x737ba0d4}, {1, 0x63378e10},
+ {1, 0x6d5f91cf}, {2, 0x88612eb8}, {2, 0xe9639484}, {1, 0xb7fabc9d},
+ {2, 0x19b01592}, {1, 0x5a90dd31}, {2, 0x5bd7e028}, {2, 0x94d00323},
+ {1, 0xa9b9c01a}, {1, 0x3a40de61}, {1, 0x56e7eec7}, {5, 0x859f7ef6},
+ {1, 0xfd8e5630}, {1, 0x2b0c9f7f}, {1, 0xba700e26}, {1, 0x7170a408},
+ {1, 0x70de86a8}, {1, 0x74d64cd5}, {1, 0x49e738a1}, {2, 0x6910b602},
+ {0, 0x643c565f}, {1, 0x54264b3f}, {2, 0x97ea6396}, {2, 0x55174459},
+ {2, 0x03e8779a}, {1, 0x98f34d8f}, {1, 0xc07b2b07}, {1, 0xdfe29668},
+ {1, 0x3141c7c1}, {1, 0xb3b595f4}, {1, 0x735abf08}, {5, 0x623bfbce},
+ {2, 0xd351e722}, {1, 0xf4ca48c9}, {1, 0x5b19c670}, {1, 0xa164bf0e},
+ {2, 0xbbbeb305}, {2, 0xfe1c810a},
+};
+
+// NOTE: These tests rely on CreateNewBlock doing its own self-validation!
+BOOST_AUTO_TEST_CASE(CreateNewBlock_validity)
+{
+ CReserveKey reservekey(pwalletMain);
+ CBlock *pblock;
+ CTransaction tx;
+ CScript script;
+ uint256 hash;
+
+ // Simple block creation, nothing special yet:
+ BOOST_CHECK(pblock = CreateNewBlock(reservekey));
+
+ // We can't make transactions until we have inputs
+ // Therefore, load 100 blocks :)
+ std::vector<CTransaction*>txFirst;
+ for (unsigned int i = 0; i < sizeof(blockinfo)/sizeof(*blockinfo); ++i)
+ {
+ pblock->nTime = pindexBest->GetMedianTimePast()+1;
+ pblock->vtx[0].vin[0].scriptSig = CScript();
+ pblock->vtx[0].vin[0].scriptSig.push_back(blockinfo[i].extranonce);
+ pblock->vtx[0].vin[0].scriptSig.push_back(pindexBest->nHeight);
+ pblock->vtx[0].vout[0].scriptPubKey = CScript();
+ if (txFirst.size() < 2)
+ txFirst.push_back(new CTransaction(pblock->vtx[0]));
+ pblock->hashMerkleRoot = pblock->BuildMerkleTree();
+ pblock->nNonce = blockinfo[i].nonce;
+ assert(ProcessBlock(NULL, pblock));
+ pblock->hashPrevBlock = pblock->GetHash();
+ }
+ delete pblock;
+
+ // Just to make sure we can still make simple blocks
+ BOOST_CHECK(pblock = CreateNewBlock(reservekey));
+
+ // block sigops > limit: 1000 CHECKMULTISIG + 1
+ tx.vin.resize(1);
+ // NOTE: OP_NOP is used to force 20 SigOps for the CHECKMULTISIG
+ tx.vin[0].scriptSig = CScript() << OP_0 << OP_0 << OP_0 << OP_NOP << OP_CHECKMULTISIG << OP_1;
+ tx.vin[0].prevout.hash = txFirst[0]->GetHash();
+ tx.vin[0].prevout.n = 0;
+ tx.vout.resize(1);
+ tx.vout[0].nValue = 5000000000LL;
+ for (unsigned int i = 0; i < 1001; ++i)
+ {
+ tx.vout[0].nValue -= 1000000;
+ hash = tx.GetHash();
+ mempool.addUnchecked(hash, tx);
+ tx.vin[0].prevout.hash = hash;
+ }
+ BOOST_CHECK(pblock = CreateNewBlock(reservekey));
+ delete pblock;
+ mempool.clear();
+
+ // block size > limit
+ tx.vin[0].scriptSig = CScript();
+ // 18 * (520char + DROP) + OP_1 = 9433 bytes
+ std::vector<unsigned char> vchData(520);
+ for (unsigned int i = 0; i < 18; ++i)
+ tx.vin[0].scriptSig << vchData << OP_DROP;
+ tx.vin[0].scriptSig << OP_1;
+ tx.vin[0].prevout.hash = txFirst[0]->GetHash();
+ tx.vout[0].nValue = 5000000000LL;
+ for (unsigned int i = 0; i < 128; ++i)
+ {
+ tx.vout[0].nValue -= 10000000;
+ hash = tx.GetHash();
+ mempool.addUnchecked(hash, tx);
+ tx.vin[0].prevout.hash = hash;
+ }
+ BOOST_CHECK(pblock = CreateNewBlock(reservekey));
+ delete pblock;
+ mempool.clear();
+
+ // orphan in mempool
+ hash = tx.GetHash();
+ mempool.addUnchecked(hash, tx);
+ BOOST_CHECK(pblock = CreateNewBlock(reservekey));
+ delete pblock;
+ mempool.clear();
+
+ // child with higher priority than parent
+ tx.vin[0].scriptSig = CScript() << OP_1;
+ tx.vin[0].prevout.hash = txFirst[1]->GetHash();
+ tx.vout[0].nValue = 4900000000LL;
+ hash = tx.GetHash();
+ mempool.addUnchecked(hash, tx);
+ tx.vin[0].prevout.hash = hash;
+ tx.vin.resize(2);
+ tx.vin[1].scriptSig = CScript() << OP_1;
+ tx.vin[1].prevout.hash = txFirst[0]->GetHash();
+ tx.vin[1].prevout.n = 0;
+ tx.vout[0].nValue = 5900000000LL;
+ hash = tx.GetHash();
+ mempool.addUnchecked(hash, tx);
+ BOOST_CHECK(pblock = CreateNewBlock(reservekey));
+ delete pblock;
+ mempool.clear();
+
+ // coinbase in mempool
+ tx.vin.resize(1);
+ tx.vin[0].prevout.SetNull();
+ tx.vin[0].scriptSig = CScript() << OP_0 << OP_1;
+ tx.vout[0].nValue = 0;
+ hash = tx.GetHash();
+ mempool.addUnchecked(hash, tx);
+ BOOST_CHECK(pblock = CreateNewBlock(reservekey));
+ delete pblock;
+ mempool.clear();
+
+ // invalid (pre-p2sh) txn in mempool
+ tx.vin[0].prevout.hash = txFirst[0]->GetHash();
+ tx.vin[0].prevout.n = 0;
+ tx.vin[0].scriptSig = CScript() << OP_1;
+ tx.vout[0].nValue = 4900000000LL;
+ script = CScript() << OP_0;
+ tx.vout[0].scriptPubKey.SetDestination(script.GetID());
+ hash = tx.GetHash();
+ mempool.addUnchecked(hash, tx);
+ tx.vin[0].prevout.hash = hash;
+ tx.vin[0].scriptSig = CScript() << (std::vector<unsigned char>)script;
+ tx.vout[0].nValue -= 1000000;
+ hash = tx.GetHash();
+ mempool.addUnchecked(hash,tx);
+ BOOST_CHECK(pblock = CreateNewBlock(reservekey));
+ delete pblock;
+ mempool.clear();
+
+ // double spend txn pair in mempool
+ tx.vin[0].prevout.hash = txFirst[0]->GetHash();
+ tx.vin[0].scriptSig = CScript() << OP_1;
+ tx.vout[0].nValue = 4900000000LL;
+ tx.vout[0].scriptPubKey = CScript() << OP_1;
+ hash = tx.GetHash();
+ mempool.addUnchecked(hash, tx);
+ tx.vout[0].scriptPubKey = CScript() << OP_2;
+ hash = tx.GetHash();
+ mempool.addUnchecked(hash, tx);
+ BOOST_CHECK(pblock = CreateNewBlock(reservekey));
+ delete pblock;
+ mempool.clear();
+
+ // subsidy changing
+ int nHeight = pindexBest->nHeight;
+ pindexBest->nHeight = 209999;
+ BOOST_CHECK(pblock = CreateNewBlock(reservekey));
+ delete pblock;
+ pindexBest->nHeight = 210000;
+ BOOST_CHECK(pblock = CreateNewBlock(reservekey));
+ delete pblock;
+ pindexBest->nHeight = nHeight;
+}
+
BOOST_AUTO_TEST_CASE(sha256transform_equality)
{
unsigned int pSHA256InitState[8] = {0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a, 0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19};
diff --git a/src/test/test_bitcoin.cpp b/src/test/test_bitcoin.cpp
index 96d63bff97..cae0bb6baf 100644
--- a/src/test/test_bitcoin.cpp
+++ b/src/test/test_bitcoin.cpp
@@ -1,6 +1,7 @@
#define BOOST_TEST_MODULE Bitcoin Test Suite
#include <boost/test/unit_test.hpp>
+#include "db.h"
#include "main.h"
#include "wallet.h"
@@ -14,13 +15,18 @@ struct TestingSetup {
TestingSetup() {
fPrintToConsole = true; // don't want to write to debug.log file
noui_connect();
- pwalletMain = new CWallet();
+ bitdb.MakeMock();
+ LoadBlockIndex(true);
+ bool fFirstRun;
+ pwalletMain = new CWallet("wallet.dat");
+ pwalletMain->LoadWallet(fFirstRun);
RegisterWallet(pwalletMain);
}
~TestingSetup()
{
delete pwalletMain;
pwalletMain = NULL;
+ bitdb.Flush(true);
}
};