diff --git a/src/makefile.mingw b/src/makefile.mingw
index 96f81b306..d630fe235 100644
--- a/src/makefile.mingw
+++ b/src/makefile.mingw
@@ -83,8 +83,8 @@ obj/nogui/%.o: %.cpp $(HEADERS)
 bitcoind.exe: $(OBJS:obj/%=obj/nogui/%) obj/ui_res.o
 	g++ $(CFLAGS) -o $@ $(LIBPATHS) $^ $(LIBS)
 
-obj/test/%.o: obj/test/%.cpp $(HEADERS)
-	g++ -c $(CFLAGS) -o $@ $<
+obj/test/test_bitcoin.o: $(wildcard test/*.cpp) $(HEADERS)
+	g++ -c $(CFLAGS) -o $@ test/test_bitcoin.cpp
 
 test_bitcoin.exe: obj/test/test_bitcoin.o $(filter-out obj/nogui/init.o,$(OBJS:obj/%=obj/nogui/%))
 	g++ $(CFLAGS) -o $@ $(LIBPATHS) $^ $(LIBS)
diff --git a/src/makefile.osx b/src/makefile.osx
index 699911d4e..363a85fc7 100644
--- a/src/makefile.osx
+++ b/src/makefile.osx
@@ -76,8 +76,8 @@ obj/nogui/%.o: %.cpp $(HEADERS)
 bitcoind: $(OBJS:obj/%=obj/nogui/%)
 	$(CXX) $(CFLAGS) -o $@ $(LIBPATHS) $^ $(LIBS)
 
-obj/test/%.o: test/%.cpp $(HEADERS)
-	$(CXX) -c $(CFLAGS) -o $@ $<
+obj/test/test_bitcoin.o: $(wildcard test/*.cpp) $(HEADERS)
+	$(CXX) -c $(CFLAGS) -o $@ test/test_bitcoin.cpp
 
 test_bitcoin: obj/test/test_bitcoin.o $(filter-out obj/nogui/init.o,$(OBJS:obj/%=obj/nogui/%))
 	$(CXX) $(CFLAGS) -o $@ $(LIBPATHS) $^ $(LIBS) -lboost_unit_test_framework
diff --git a/src/makefile.unix b/src/makefile.unix
index 4c9279729..597eea0dc 100644
--- a/src/makefile.unix
+++ b/src/makefile.unix
@@ -77,8 +77,8 @@ obj/nogui/%.o: %.cpp $(HEADERS)
 bitcoind: $(OBJS:obj/%=obj/nogui/%)
 	$(CXX) $(CXXFLAGS) -o $@ $^ $(LIBS)
 
-obj/test/%.o: test/%.cpp $(HEADERS)
-	$(CXX) -c $(CXXFLAGS) -o $@ $<
+obj/test/test_bitcoin.o: $(wildcard test/*.cpp) $(HEADERS)
+	$(CXX) -c $(CFLAGS) -o $@ test/test_bitcoin.cpp
 
 test_bitcoin: obj/test/test_bitcoin.o $(filter-out obj/nogui/init.o,$(OBJS:obj/%=obj/nogui/%))
 	$(CXX) $(CXXFLAGS) -o $@ $(LIBPATHS) $^ -Wl,-Bstatic -lboost_unit_test_framework $(LIBS)
diff --git a/src/test/script_tests.cpp b/src/test/script_tests.cpp
index 5e74648c4..13feb86b9 100644
--- a/src/test/script_tests.cpp
+++ b/src/test/script_tests.cpp
@@ -6,6 +6,9 @@
 #include "../wallet.h"
 
 using namespace std;
+extern uint256 SignatureHash(CScript scriptCode, const CTransaction& txTo, unsigned int nIn, int nHashType);
+extern bool VerifyScript(const CScript& scriptSig, const CScript& scriptPubKey, const CTransaction& txTo, unsigned int nIn, int nHashType);
+extern bool VerifySignature(const CTransaction& txFrom, const CTransaction& txTo, unsigned int nIn, int nHashType);
 
 BOOST_AUTO_TEST_SUITE(script_tests)
 
@@ -34,4 +37,137 @@ BOOST_AUTO_TEST_CASE(script_PushData)
     BOOST_CHECK(pushdata4Stack == directStack);
 }
 
+CScript
+sign_multisig(CScript scriptPubKey, std::vector<CKey> keys, CTransaction transaction)
+{
+    uint256 hash = SignatureHash(scriptPubKey, transaction, 0, SIGHASH_ALL);
+
+    CScript result;
+    //
+    // NOTE: CHECKMULTISIG has an unfortunate bug; it requires
+    // one extra item on the stack, before the signatures.
+    // Putting OP_0 on the stack is the workaround;
+    // fixing the bug would mean splitting the blockchain (old
+    // clients would not accept new CHECKMULTISIG transactions,
+    // and vice-versa)
+    //
+    result << OP_0;
+    BOOST_FOREACH(CKey key, keys)
+    {
+        vector<unsigned char> vchSig;
+        BOOST_CHECK(key.Sign(hash, vchSig));
+        vchSig.push_back((unsigned char)SIGHASH_ALL);
+        result << vchSig;
+    }
+    return result;
+}
+CScript
+sign_multisig(CScript scriptPubKey, CKey key, CTransaction transaction)
+{
+    std::vector<CKey> keys;
+    keys.push_back(key);
+    return sign_multisig(scriptPubKey, keys, transaction);
+}
+
+BOOST_AUTO_TEST_CASE(script_CHECKMULTISIG12)
+{
+    CKey key1, key2, key3;
+    key1.MakeNewKey();
+    key2.MakeNewKey();
+    key3.MakeNewKey();
+
+    CScript scriptPubKey12;
+    scriptPubKey12 << OP_1 << key1.GetPubKey() << key2.GetPubKey() << OP_2 << OP_CHECKMULTISIG;
+
+    CTransaction txFrom12;
+    txFrom12.vout.resize(1);
+    txFrom12.vout[0].scriptPubKey = scriptPubKey12;
+
+    CTransaction txTo12;
+    txTo12.vin.resize(1);
+    txTo12.vout.resize(1);
+    txTo12.vin[0].prevout.n = 0;
+    txTo12.vin[0].prevout.hash = txFrom12.GetHash();
+    txTo12.vout[0].nValue = 1;
+
+    CScript goodsig1 = sign_multisig(scriptPubKey12, key1, txTo12);
+    BOOST_CHECK(VerifyScript(goodsig1, scriptPubKey12, txTo12, 0, 0));
+    txTo12.vout[0].nValue = 2;
+    BOOST_CHECK(!VerifyScript(goodsig1, scriptPubKey12, txTo12, 0, 0));
+
+    CScript goodsig2 = sign_multisig(scriptPubKey12, key2, txTo12);
+    BOOST_CHECK(VerifyScript(goodsig2, scriptPubKey12, txTo12, 0, 0));
+
+    CScript badsig1 = sign_multisig(scriptPubKey12, key3, txTo12);
+    BOOST_CHECK(!VerifyScript(badsig1, scriptPubKey12, txTo12, 0, 0));
+}
+
+BOOST_AUTO_TEST_CASE(script_CHECKMULTISIG23)
+{
+    CKey key1, key2, key3, key4;
+    key1.MakeNewKey();
+    key2.MakeNewKey();
+    key3.MakeNewKey();
+    key4.MakeNewKey();
+
+    CScript scriptPubKey23;
+    scriptPubKey23 << OP_2 << key1.GetPubKey() << key2.GetPubKey() << key3.GetPubKey() << OP_3 << OP_CHECKMULTISIG;
+
+    CTransaction txFrom23;
+    txFrom23.vout.resize(1);
+    txFrom23.vout[0].scriptPubKey = scriptPubKey23;
+
+    CTransaction txTo23;
+    txTo23.vin.resize(1);
+    txTo23.vout.resize(1);
+    txTo23.vin[0].prevout.n = 0;
+    txTo23.vin[0].prevout.hash = txFrom23.GetHash();
+    txTo23.vout[0].nValue = 1;
+
+    std::vector<CKey> keys;
+    keys.push_back(key1); keys.push_back(key2);
+    CScript goodsig1 = sign_multisig(scriptPubKey23, keys, txTo23);
+    BOOST_CHECK(VerifyScript(goodsig1, scriptPubKey23, txTo23, 0, 0));
+
+    keys.clear();
+    keys.push_back(key1); keys.push_back(key3);
+    CScript goodsig2 = sign_multisig(scriptPubKey23, keys, txTo23);
+    BOOST_CHECK(VerifyScript(goodsig2, scriptPubKey23, txTo23, 0, 0));
+
+    keys.clear();
+    keys.push_back(key2); keys.push_back(key3);
+    CScript goodsig3 = sign_multisig(scriptPubKey23, keys, txTo23);
+    BOOST_CHECK(VerifyScript(goodsig3, scriptPubKey23, txTo23, 0, 0));
+
+    keys.clear();
+    keys.push_back(key2); keys.push_back(key2); // Can't re-use sig
+    CScript badsig1 = sign_multisig(scriptPubKey23, keys, txTo23);
+    BOOST_CHECK(!VerifyScript(badsig1, scriptPubKey23, txTo23, 0, 0));
+
+    keys.clear();
+    keys.push_back(key2); keys.push_back(key1); // sigs must be in correct order
+    CScript badsig2 = sign_multisig(scriptPubKey23, keys, txTo23);
+    BOOST_CHECK(!VerifyScript(badsig2, scriptPubKey23, txTo23, 0, 0));
+
+    keys.clear();
+    keys.push_back(key3); keys.push_back(key2); // sigs must be in correct order
+    CScript badsig3 = sign_multisig(scriptPubKey23, keys, txTo23);
+    BOOST_CHECK(!VerifyScript(badsig3, scriptPubKey23, txTo23, 0, 0));
+
+    keys.clear();
+    keys.push_back(key4); keys.push_back(key2); // sigs must match pubkeys
+    CScript badsig4 = sign_multisig(scriptPubKey23, keys, txTo23);
+    BOOST_CHECK(!VerifyScript(badsig4, scriptPubKey23, txTo23, 0, 0));
+
+    keys.clear();
+    keys.push_back(key1); keys.push_back(key4); // sigs must match pubkeys
+    CScript badsig5 = sign_multisig(scriptPubKey23, keys, txTo23);
+    BOOST_CHECK(!VerifyScript(badsig5, scriptPubKey23, txTo23, 0, 0));
+
+    keys.clear(); // Must have signatures
+    CScript badsig6 = sign_multisig(scriptPubKey23, keys, txTo23);
+    BOOST_CHECK(!VerifyScript(badsig6, scriptPubKey23, txTo23, 0, 0));
+}    
+
+
 BOOST_AUTO_TEST_SUITE_END()