Merge pull request #4845

4705902 Avoid introducing a virtual into CChainParams (Wladimir J. van der Laan)
5e2e7fc Suggested corrections on comments, variable names. Also new test case testing the PoW skip in UNITTEST. (SergioDemianLerner)
a25fd6b Switch testing framework from MAIN to new UNITTEST network (SergioDemianLerner)

12 files changed, 371 insertions, 4 deletions

diff --git a/src/Makefile.test.include b/src/Makefile.test.include
index ab449f3e71..d376961996 100644
--- a/src/Makefile.test.include
+++ b/src/Makefile.test.include
@@ -51,6 +51,7 @@ BITCOIN_TESTS =\
   test/key_tests.cpp \
   test/main_tests.cpp \
   test/miner_tests.cpp \
+  test/blockv2_tests.cpp \
   test/mruset_tests.cpp \
   test/multisig_tests.cpp \
   test/netbase_tests.cpp \
diff --git a/src/chainparams.cpp b/src/chainparams.cpp
index 179db5a818..31c67715c8 100644
--- a/src/chainparams.cpp
+++ b/src/chainparams.cpp
@@ -115,6 +115,7 @@ public:
         fAllowMinDifficultyBlocks = false;
         fRequireStandard = true;
         fMineBlocksOnDemand = false;
+        fSkipProofOfWorkCheck = false;
     }
 };
 static CMainParams mainParams;
@@ -214,8 +215,46 @@ public:
 };
 static CRegTestParams regTestParams;
 
+//
+// Unit test
+//
+class CUnitTestParams : public CMainParams, public CModifiableParams {
+public:
+    CUnitTestParams() {
+        networkID = CBaseChainParams::UNITTEST;
+        strNetworkID = "unittest";
+        nDefaultPort = 18445;
+        vFixedSeeds.clear();
+        vSeeds.clear();  // Regtest mode doesn't have any DNS seeds.
+
+        fRequireRPCPassword = false;
+        fMiningRequiresPeers = false;
+        fDefaultCheckMemPool = true;
+        fAllowMinDifficultyBlocks = false;
+        fMineBlocksOnDemand = true;
+    }
+public:
+    // Published setters to allow changing values in unit test cases
+    virtual void setSubsidyHalvingInterval(int anSubsidyHalvingInterval)  { nSubsidyHalvingInterval=anSubsidyHalvingInterval; }
+    virtual void setEnforceBlockUpgradeMajority(int anEnforceBlockUpgradeMajority)  { nEnforceBlockUpgradeMajority=anEnforceBlockUpgradeMajority; }
+    virtual void setRejectBlockOutdatedMajority(int anRejectBlockOutdatedMajority)  { nRejectBlockOutdatedMajority=anRejectBlockOutdatedMajority; }
+    virtual void setToCheckBlockUpgradeMajority(int anToCheckBlockUpgradeMajority)  { nToCheckBlockUpgradeMajority=anToCheckBlockUpgradeMajority; }
+    virtual void setDefaultCheckMemPool(bool afDefaultCheckMemPool)  { fDefaultCheckMemPool=afDefaultCheckMemPool; }
+    virtual void setAllowMinDifficultyBlocks(bool afAllowMinDifficultyBlocks) {  fAllowMinDifficultyBlocks=afAllowMinDifficultyBlocks; }
+    virtual void setSkipProofOfWorkCheck(bool afSkipProofOfWorkCheck) { fSkipProofOfWorkCheck = afSkipProofOfWorkCheck; }
+};
+static CUnitTestParams unitTestParams;
+
+
 static CChainParams *pCurrentParams = 0;
 
+CModifiableParams *ModifiableParams()
+{
+   assert(pCurrentParams);
+   assert(pCurrentParams==&unitTestParams);
+   return (CModifiableParams*)&unitTestParams;
+}
+
 const CChainParams &Params() {
     assert(pCurrentParams);
     return *pCurrentParams;
@@ -229,6 +268,8 @@ CChainParams &Params(CBaseChainParams::Network network) {
             return testNetParams;
         case CBaseChainParams::REGTEST:
             return regTestParams;
+        case CBaseChainParams::UNITTEST:
+            return unitTestParams;
         default:
             assert(false && "Unimplemented network");
             return mainParams;
diff --git a/src/chainparams.h b/src/chainparams.h
index e5dfc87c6d..50441a89f3 100644
--- a/src/chainparams.h
+++ b/src/chainparams.h
@@ -61,6 +61,8 @@ public:
     bool DefaultCheckMemPool() const { return fDefaultCheckMemPool; }
     /* Allow mining of a min-difficulty block */
     bool AllowMinDifficultyBlocks() const { return fAllowMinDifficultyBlocks; }
+    /* Skip proof-of-work check: allow mining of any difficulty block */
+    bool SkipProofOfWorkCheck() const { return fSkipProofOfWorkCheck; }
     /* Make standard checks */
     bool RequireStandard() const { return fRequireStandard; }
     int64_t TargetTimespan() const { return nTargetTimespan; }
@@ -103,8 +105,27 @@ protected:
     bool fAllowMinDifficultyBlocks;
     bool fRequireStandard;
     bool fMineBlocksOnDemand;
+    bool fSkipProofOfWorkCheck;
 };
 
+/** Modifiable parameters interface is used by test cases to adapt the parameters in order
+*** to test specific features more easily. Test cases should always restore the previous
+*** values after finalization.
+**/
+
+class CModifiableParams {
+public:
+    // Published setters to allow changing values in unit test cases
+    virtual void setSubsidyHalvingInterval(int anSubsidyHalvingInterval) =0;
+    virtual void setEnforceBlockUpgradeMajority(int anEnforceBlockUpgradeMajority)=0;
+    virtual void setRejectBlockOutdatedMajority(int anRejectBlockOutdatedMajority)=0;
+    virtual void setToCheckBlockUpgradeMajority(int anToCheckBlockUpgradeMajority)=0;
+    virtual void setDefaultCheckMemPool(bool aDefaultCheckMemPool)=0;
+    virtual void setAllowMinDifficultyBlocks(bool aAllowMinDifficultyBlocks)=0;
+    virtual void setSkipProofOfWorkCheck(bool aSkipProofOfWorkCheck)=0;
+};
+
+
 /**
  * Return the currently selected parameters. This won't change after app startup
  * outside of the unit tests.
@@ -114,6 +135,9 @@ const CChainParams &Params();
 /** Return parameters for the given network. */
 CChainParams &Params(CBaseChainParams::Network network);
 
+/** Get modifyable network parameters (UNITTEST only) */
+CModifiableParams *ModifiableParams();
+
 /** Sets the params returned by Params() to those for the given network. */
 void SelectParams(CBaseChainParams::Network network);
 
diff --git a/src/chainparamsbase.cpp b/src/chainparamsbase.cpp
index 98bb5b855f..e9d63197bd 100644
--- a/src/chainparamsbase.cpp
+++ b/src/chainparamsbase.cpp
@@ -57,6 +57,20 @@ public:
 };
 static CBaseRegTestParams regTestParams;
 
+//
+// Unit test
+//
+class CBaseUnitTestParams : public CBaseMainParams
+{
+public:
+    CBaseUnitTestParams()
+    {
+        networkID = CBaseChainParams::UNITTEST;
+        strDataDir = "unittest";
+    }
+};
+static CBaseUnitTestParams unitTestParams;
+
 static CBaseChainParams* pCurrentBaseParams = 0;
 
 const CBaseChainParams& BaseParams()
@@ -77,6 +91,9 @@ void SelectBaseParams(CBaseChainParams::Network network)
     case CBaseChainParams::REGTEST:
         pCurrentBaseParams = &regTestParams;
         break;
+    case CBaseChainParams::UNITTEST:
+        pCurrentBaseParams = &unitTestParams;
+        break;
     default:
         assert(false && "Unimplemented network");
         return;
diff --git a/src/chainparamsbase.h b/src/chainparamsbase.h
index c054f03f17..cc154cf501 100644
--- a/src/chainparamsbase.h
+++ b/src/chainparamsbase.h
@@ -19,6 +19,7 @@ public:
         MAIN,
         TESTNET,
         REGTEST,
+        UNITTEST,
 
         MAX_NETWORK_TYPES
     };
diff --git a/src/checkpoints.cpp b/src/checkpoints.cpp
index c41deea7ce..9a6bc05e63 100644
--- a/src/checkpoints.cpp
+++ b/src/checkpoints.cpp
@@ -88,6 +88,8 @@ namespace Checkpoints {
             return dataTestnet;
         else if (Params().NetworkID() == CBaseChainParams::MAIN)
             return data;
+        else if (Params().NetworkID() == CBaseChainParams::UNITTEST) // UnitTest share the same checkpoints as MAIN
+            return data;
         else
             return dataRegtest;
     }
diff --git a/src/main.cpp b/src/main.cpp
index a3e36ff872..55485c86ff 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -2305,7 +2305,8 @@ bool AcceptBlockHeader(CBlockHeader& block, CValidationState& state, CBlockIndex
         nHeight = pindexPrev->nHeight+1;
 
         // Check proof of work
-        if (block.nBits != GetNextWorkRequired(pindexPrev, &block))
+        if ((!Params().SkipProofOfWorkCheck()) &&
+           (block.nBits != GetNextWorkRequired(pindexPrev, &block)))
             return state.DoS(100, error("AcceptBlock() : incorrect proof of work"),
                              REJECT_INVALID, "bad-diffbits");
 
diff --git a/src/pow.cpp b/src/pow.cpp
index 893f6c18be..d50222849c 100644
--- a/src/pow.cpp
+++ b/src/pow.cpp
@@ -81,6 +81,10 @@ bool CheckProofOfWork(uint256 hash, unsigned int nBits)
     bool fNegative;
     bool fOverflow;
     uint256 bnTarget;
+
+    if (Params().SkipProofOfWorkCheck())
+       return true;
+
     bnTarget.SetCompact(nBits, &fNegative, &fOverflow);
 
     // Check range
diff --git a/src/test/base58_tests.cpp b/src/test/base58_tests.cpp
index 58fffb6df4..c298c805da 100644
--- a/src/test/base58_tests.cpp
+++ b/src/test/base58_tests.cpp
@@ -175,7 +175,7 @@ BOOST_AUTO_TEST_CASE(base58_keys_valid_parse)
             BOOST_CHECK_MESSAGE(!secret.IsValid(), "IsValid pubkey as privkey:" + strTest);
         }
     }
-    SelectParams(CBaseChainParams::MAIN);
+    SelectParams(CBaseChainParams::UNITTEST);
 }
 
 // Goal: check that generated keys match test vectors
@@ -243,7 +243,7 @@ BOOST_AUTO_TEST_CASE(base58_keys_valid_gen)
     CTxDestination nodest = CNoDestination();
     BOOST_CHECK(!dummyAddr.Set(nodest));
 
-    SelectParams(CBaseChainParams::MAIN);
+    SelectParams(CBaseChainParams::UNITTEST);
 }
 
 // Goal: check that base58 parsing code is robust against a variety of corrupted data
diff --git a/src/test/blockv2_tests.cpp b/src/test/blockv2_tests.cpp
new file mode 100644
index 0000000000..96c0df5e6b
--- /dev/null
+++ b/src/test/blockv2_tests.cpp
@@ -0,0 +1,275 @@
+// Copyright (c) 2011-2014 The Bitcoin Core developers
+// Distributed under the MIT/X11 software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#include "main.h"
+#include "miner.h"
+#include "uint256.h"
+#include "util.h"
+
+#include <boost/test/unit_test.hpp>
+
+// This test cheecks the majority rule which states that after 1000 v2 blocks no new v1 block can be part of that branch.
+
+BOOST_AUTO_TEST_SUITE(blockv2_tests)
+
+static CScript scriptPubKey = CScript() << ParseHex("04678afdb0fe5548271967f1a67130b7105cd6a828e03909a67962e0ea1f61deb649f6bc3f4cef38c4f35504e51ec112de5c384df7ba0b8d578a4c702b6bf11d5f") << OP_CHECKSIG;
+
+static void SetEmptyBlock(CBlock * pblock)
+{
+    pblock->nVersion = 2;
+    pblock->nTime = chainActive.Tip()->GetMedianTimePast()+1;
+    pblock->nNonce = 0;
+}
+
+static void SetBlockDefaultAttributesAndHeight(CBlock * pblock,bool addHeight,int heightDifference)
+{
+    SetEmptyBlock(pblock);
+
+    // Add the coinbase
+    CMutableTransaction txCoinbase(pblock->vtx[0]);
+
+    if (addHeight)
+        txCoinbase.vin[0].scriptSig = (CScript() << (chainActive.Height()+1+heightDifference) << 0);
+        else
+        txCoinbase.vin[0].scriptSig = (CScript() << heightDifference << 0); // At least size 2, this is a protocol spec
+
+    txCoinbase.vout[0].scriptPubKey = CScript();
+    pblock->vtx[0] = CTransaction(txCoinbase);
+    pblock->hashMerkleRoot = pblock->BuildMerkleTree();
+}
+
+void CheckSubsidyHalving(CBlockTemplate * &pblocktemplate, CBlock * &pblock)
+{
+    if ((chainActive.Height()+1) % Params().SubsidyHalvingInterval() == 0)
+        {
+            // The RegTest network has a low subsidy halving interval (150) so
+            // we must recompute the coinbase subsidy if we reach the boundary.
+            // The unittest network allows modifying this interval. We check it so this
+            // test can work in any network.
+
+            // preserve parent hash
+            uint256 prevParent = pblock->hashPrevBlock;
+            delete pblocktemplate;
+            pblocktemplate = CreateNewBlock(scriptPubKey);
+            pblock = &pblocktemplate->block; // pointer for convenience
+            pblock->hashPrevBlock = prevParent;
+        }
+}
+
+void CheckBlockAddedToBestChainSuccessfully(CBlock *pblock)
+{
+    int PreviousHeight;
+    CValidationState state;
+
+    PreviousHeight = chainActive.Height();
+    BOOST_CHECK(ProcessBlock(state, NULL, pblock));
+    BOOST_CHECK(state.IsValid());
+    BOOST_CHECK((PreviousHeight+1) == chainActive.Height()); // to differentiate from orphan blocks, which also get accepted in ProcessBlock()
+
+    // Previous checks do not assure the current best chain has pblock as tip. It could be the case that a because
+    // of a malfunction in the chain reorganization code, a reorganization causes an increase of the chain length, but with another tip.
+    // So we also check that.
+    BOOST_CHECK(chainActive.Tip()->GetBlockHash()==pblock->GetHash());
+}
+
+void Blockv2test()
+{
+    assert(Params().NetworkID() == CBaseChainParams::UNITTEST);
+    ModifiableParams()->setSkipProofOfWorkCheck(true);
+
+    // We don't know the state of the block-chain here: it depends on which other tests are run before this test.
+    // See https://github.com/bitcoin/bitcoin/pull/4688 for a patch that allows the re-creation of the block-chain
+    // for each testcase that requires it.
+
+    // If miner_tests.cpp is run before, the chain will be 100 blocks long, and all of them will be v1
+
+
+    LogPrintf("Blockv2test testcase starts\n");
+
+    CBlockTemplate *pblocktemplate;
+    CScript script;
+    uint256 hash;
+    int PreviousHeight;
+
+    LOCK(cs_main);
+
+    // Simple block creation, nothing special yet.
+    pblocktemplate = CreateNewBlock(scriptPubKey);
+    CBlock *pblock = &pblocktemplate->block; // pointer for convenience
+
+    LogPrintf("Blockv2test block v1 add begin\n");
+
+    ////////////////////////////////////////////////////////////////////////////////////////
+    // First create a block v1, check that it is accepted. The block has an invalid height.
+    ////////////////////////////////////////////////////////////////////////////////////////
+    SetBlockDefaultAttributesAndHeight(pblock,false,5000);
+    pblock->nVersion = 1;
+    CValidationState state1;
+    PreviousHeight = chainActive.Height();
+    BOOST_CHECK(ProcessBlock(state1, NULL, pblock));
+    BOOST_CHECK(state1.IsValid());
+    BOOST_CHECK((PreviousHeight+1) == chainActive.Height()); // to differentiate from orphan blocks, which also get accepted in ProcessBlock()
+    pblock->hashPrevBlock = pblock->GetHash(); // update parent
+
+
+
+    // First check that the supermajority threshold is exactly 1000 blocks
+    BOOST_CHECK(Params().ToCheckBlockUpgradeMajority()==1000);  //
+    BOOST_CHECK(Params().EnforceBlockUpgradeMajority()==750);
+    BOOST_CHECK(Params().RejectBlockOutdatedMajority()==950);
+
+    // Over the last 1000 blocks, 750 blocks must be v2 to switch to v2-only mode.
+    // Here we're testing only the last 750, not any subset.
+
+    LogPrintf("Blockv2test BIP30 repetition begin\n");
+
+    ///////////////////////////////////////////////////////////////////////////////////////////////////////
+    // First, if we try to add a block v2 with the same coinbase tx, we should get
+    // "bad-txns-BIP30" because the coinbase tx has the same hash as the previous.
+    // Even if ConnectBlock returns a "bad-txns-BIP30", ActivateBestChainStep clears
+    // the state, so we get true here and the "bad-txns-BIP30" reason is lost. But this
+    // is the intended behaviour: Receiving a single block can cause zero or multiple blocks to be
+    // connected, and ActivateBestChain's responsibility is just switching the best block whatsoever.
+    // Feedback about failures causes a reject message to be sent to the peer from which we received
+    // the actual block (not necessarily the same as from whom we got the block that caused the reorg),
+    // for which we remember the peerid.
+    // Because we cannot access the failure reason here, we just verify instead that the chain
+    // height has not been incremented.
+    //////////////////////////////////////////////////////////////////////////////////////////////////////
+
+    CValidationState state7;
+    PreviousHeight = chainActive.Height();
+    CheckSubsidyHalving(pblocktemplate,pblock);
+    SetBlockDefaultAttributesAndHeight(pblock,false,5000); //
+    pblock->nVersion = 2;
+    BOOST_CHECK(ProcessBlock(state7, NULL, pblock)); // should we care about the return value?
+    BOOST_CHECK(state7.IsValid());
+    BOOST_CHECK(PreviousHeight == chainActive.Height()); // we check the block has not been added.
+
+    LogPrintf("Blockv2test 750 v2 blocks  begin\n");
+
+    ////////////////////////////
+    // Now create 750 v2 blocks
+    ////////////////////////////
+
+    for (int i=0;i<750;i++)
+    {
+
+        LogPrintf("Blockv2test block %d begin\n",i);
+
+        CheckSubsidyHalving(pblocktemplate,pblock);
+
+        // We add a value to the height to make is NOT equal to the actual height.
+        SetBlockDefaultAttributesAndHeight(pblock,true,1000); // blocks version 2 without height are allowed! for only 750 blocks
+        pblock->nVersion = 2;
+
+        CheckBlockAddedToBestChainSuccessfully(pblock);
+        pblock->hashPrevBlock = pblock->GetHash(); // update parent
+    }
+
+    LogPrintf("Blockv2test v2 without height rejected begin\n");
+
+    /////////////////////////////////////////////////////////////////////////////////////
+    // Now we try to add a block v2, with an invalid height and it should be rejected.
+    // We use 2000 as argument heightDifference because is not in the range [1000..1750].
+    /////////////////////////////////////////////////////////////////////////////////////
+    CheckSubsidyHalving(pblocktemplate,pblock);
+    SetBlockDefaultAttributesAndHeight(pblock,true,2000); //
+    pblock->nVersion = 2;
+    CValidationState state0;
+    BOOST_CHECK(ProcessBlock(state0, NULL, pblock)==false);
+    BOOST_CHECK(!state0.IsValid());
+    BOOST_CHECK(state0.GetRejectReason()=="bad-cb-height");
+    // Do not update parent since block has failed
+
+    LogPrintf("Blockv2test v2 with height accepted begin\n");
+
+    /////////////////////////////////////////////////////////////
+    // Now we add 200 additional blocks, until we get 950
+    // (the threshold where v1 blocks are not accepted anymore)
+    /////////////////////////////////////////////////////////////
+    for (int i=0;i<200;i++)
+    {
+
+        LogPrintf("Blockv2test v2block %d begin\n",i);
+        CheckSubsidyHalving(pblocktemplate,pblock);
+        SetBlockDefaultAttributesAndHeight(pblock,true,0);
+        pblock->nVersion = 2;
+        CheckBlockAddedToBestChainSuccessfully(pblock);
+        pblock->hashPrevBlock = pblock->GetHash(); // update parent
+    }
+
+
+    LogPrintf("Blockv2test block v1 rejected\n");
+
+    /////////////////////////////////////////////////////////////////////////////////////////
+    // Now we try to add a block v1, it should be rejected, even if it hash the height field
+    /////////////////////////////////////////////////////////////////////////////////////////
+    CheckSubsidyHalving(pblocktemplate,pblock);
+    SetBlockDefaultAttributesAndHeight(pblock,true,0);
+    pblock->nVersion = 1;
+    CValidationState state2;
+    BOOST_CHECK(ProcessBlock(state2, NULL, pblock)==false);
+    BOOST_CHECK(!state2.IsValid());
+    BOOST_CHECK(state2.GetRejectReason()=="bad-version");
+    // Do not update parent since block has failed
+
+    ////////////////////////////////////////////////////////
+    // Block time too old check
+    ////////////////////////////////////////////////////////
+    CheckSubsidyHalving(pblocktemplate,pblock);
+    SetBlockDefaultAttributesAndHeight(pblock,true,0);
+    pblock->nVersion = 2;
+    pblock->nTime = chainActive.Tip()->GetMedianTimePast()-1;
+    CValidationState state4;
+    BOOST_CHECK(ProcessBlock(state4, NULL, pblock)==false);
+    BOOST_CHECK(!state4.IsValid());
+    BOOST_CHECK(state4.GetRejectReason()=="time-too-old");
+    // Do not update parent since block has failed
+
+    ////////////////////////////////////////////////////////
+    // Adding a non-final coinbase, must modify coinbase
+    ////////////////////////////////////////////////////////
+    CheckSubsidyHalving(pblocktemplate,pblock);
+    SetEmptyBlock(pblock);
+    // Use a mutable coinbase to change nLockTime and  nSequence
+    CMutableTransaction txCoinbase(pblock->vtx[0]);
+    txCoinbase.vin[0].scriptSig = (CScript() << chainActive.Height() << 0);
+    txCoinbase.nLockTime = LOCKTIME_THRESHOLD-1; // refers to height
+    txCoinbase.vin[0].nSequence = 1; // non-zero sequence
+    pblock->vtx[0] = CTransaction(txCoinbase);
+    pblock->nVersion = 2;
+    pblock->hashMerkleRoot = pblock->BuildMerkleTree();
+    CValidationState state5;
+    BOOST_CHECK(ProcessBlock(state5, NULL, pblock)==false);
+    BOOST_CHECK(!state5.IsValid());
+    BOOST_CHECK(state5.GetRejectReason()=="bad-txns-nonfinal");
+    // Do not update parent since block has failed
+
+    ModifiableParams()->setSkipProofOfWorkCheck(false);
+
+    ////////////////////////////////////////////////////////////////////////////////
+    // Just to be sure that proof-of-work skipping is working ok, we submit a block
+    // without enought proof of work and it must be rejected.
+    ////////////////////////////////////////////////////////////////////////////////
+    CheckSubsidyHalving(pblocktemplate,pblock);
+    SetBlockDefaultAttributesAndHeight(pblock,true,0);
+    pblock->nVersion = 2;
+    CValidationState state6;
+    BOOST_CHECK(ProcessBlock(state6, NULL, pblock)==false);
+    BOOST_CHECK(!state6.IsValid());
+    BOOST_CHECK(state6.GetRejectReason()=="high-hash");
+
+    delete pblocktemplate;
+
+
+    LogPrintf("Blockv2test testcase ends\n");
+}
+
+BOOST_AUTO_TEST_CASE(Blockv2testcase)
+{
+    Blockv2test();
+}
+
+BOOST_AUTO_TEST_SUITE_END()
diff --git a/src/test/miner_tests.cpp b/src/test/miner_tests.cpp
index 9e4669eba9..bad5c13ac2 100644
--- a/src/test/miner_tests.cpp
+++ b/src/test/miner_tests.cpp
@@ -253,6 +253,7 @@ BOOST_AUTO_TEST_CASE(CreateNewBlock_validity)
 
     chainActive.Tip()->nHeight--;
     SetMockTime(0);
+    mempool.clear();
 
     BOOST_FOREACH(CTransaction *tx, txFirst)
         delete tx;
diff --git a/src/test/test_bitcoin.cpp b/src/test/test_bitcoin.cpp
index 68fad8d038..6e5f0e3fac 100644
--- a/src/test/test_bitcoin.cpp
+++ b/src/test/test_bitcoin.cpp
@@ -31,7 +31,7 @@ struct TestingSetup {
 
     TestingSetup() {
         fPrintToDebugLog = false; // don't want to write to debug.log file
-        SelectParams(CBaseChainParams::MAIN);
+        SelectParams(CBaseChainParams::UNITTEST);
         noui_connect();
 #ifdef ENABLE_WALLET
         bitdb.MakeMock();