diff --git a/src/Makefile.gtest.include b/src/Makefile.gtest.include
index 690f0dab..1a76f846 100644
--- a/src/Makefile.gtest.include
+++ b/src/Makefile.gtest.include
@@ -13,7 +13,7 @@ zcash_gtest_SOURCES = \
 
 zcash_gtest_CPPFLAGS = -DMULTICORE -fopenmp -DBINARY_OUTPUT -DCURVE_ALT_BN128 -DSTATIC
 
-zcash_gtest_LDADD = -lgtest $(LIBBITCOIN_SERVER) $(LIBBITCOIN_CLI) $(LIBBITCOIN_COMMON) $(LIBBITCOIN_UTIL) $(LIBBITCOIN_CRYPTO) $(LIBBITCOIN_UNIVALUE) $(LIBLEVELDB) $(LIBMEMENV) \
+zcash_gtest_LDADD = -lgtest -lgmock $(LIBBITCOIN_SERVER) $(LIBBITCOIN_CLI) $(LIBBITCOIN_COMMON) $(LIBBITCOIN_UTIL) $(LIBBITCOIN_CRYPTO) $(LIBBITCOIN_UNIVALUE) $(LIBLEVELDB) $(LIBMEMENV) \
   $(BOOST_LIBS) $(BOOST_UNIT_TEST_FRAMEWORK_LIB) $(LIBSECP256K1)
 if ENABLE_WALLET
 zcash_gtest_LDADD += $(LIBBITCOIN_WALLET)
diff --git a/src/consensus/validation.h b/src/consensus/validation.h
index 68ac4163..8e1ac2ef 100644
--- a/src/consensus/validation.h
+++ b/src/consensus/validation.h
@@ -33,7 +33,7 @@ private:
     bool pourVerify;
 public:
     CValidationState() : mode(MODE_VALID), nDoS(0), chRejectCode(0), corruptionPossible(false), pourVerify(true) {}
-    bool DoS(int level, bool ret = false,
+    virtual bool DoS(int level, bool ret = false,
              unsigned char chRejectCodeIn=0, std::string strRejectReasonIn="",
              bool corruptionIn=false) {
         chRejectCode = chRejectCodeIn;
@@ -45,43 +45,43 @@ public:
         mode = MODE_INVALID;
         return ret;
     }
-    bool SetPerformPourVerification(bool pourVerifyIn) {
+    virtual bool SetPerformPourVerification(bool pourVerifyIn) {
         pourVerify = pourVerifyIn;
     }
-    bool PerformPourVerification() {
+    virtual bool PerformPourVerification() {
         return pourVerify;
     }
-    bool Invalid(bool ret = false,
+    virtual bool Invalid(bool ret = false,
                  unsigned char _chRejectCode=0, std::string _strRejectReason="") {
         return DoS(0, ret, _chRejectCode, _strRejectReason);
     }
-    bool Error(std::string strRejectReasonIn="") {
+    virtual bool Error(std::string strRejectReasonIn="") {
         if (mode == MODE_VALID)
             strRejectReason = strRejectReasonIn;
         mode = MODE_ERROR;
         return false;
     }
-    bool IsValid() const {
+    virtual bool IsValid() const {
         return mode == MODE_VALID;
     }
-    bool IsInvalid() const {
+    virtual bool IsInvalid() const {
         return mode == MODE_INVALID;
     }
-    bool IsError() const {
+    virtual bool IsError() const {
         return mode == MODE_ERROR;
     }
-    bool IsInvalid(int &nDoSOut) const {
+    virtual bool IsInvalid(int &nDoSOut) const {
         if (IsInvalid()) {
             nDoSOut = nDoS;
             return true;
         }
         return false;
     }
-    bool CorruptionPossible() const {
+    virtual bool CorruptionPossible() const {
         return corruptionPossible;
     }
-    unsigned char GetRejectCode() const { return chRejectCode; }
-    std::string GetRejectReason() const { return strRejectReason; }
+    virtual unsigned char GetRejectCode() const { return chRejectCode; }
+    virtual std::string GetRejectReason() const { return strRejectReason; }
 };
 
 #endif // BITCOIN_CONSENSUS_VALIDATION_H
diff --git a/src/gtest/test_checktransaction.cpp b/src/gtest/test_checktransaction.cpp
index 48d8d5e7..eaaa6f08 100644
--- a/src/gtest/test_checktransaction.cpp
+++ b/src/gtest/test_checktransaction.cpp
@@ -1,4 +1,5 @@
 #include <gtest/gtest.h>
+#include <gmock/gmock.h>
 
 #include "main.h"
 #include "primitives/transaction.h"
@@ -24,3 +25,29 @@ TEST(checktransaction_tests, check_vpub_not_both_nonzero) {
         EXPECT_EQ(state.GetRejectReason(), "bad-txns-vpubs-both-nonzero");
     }
 }
+
+class MockCValidationState : public CValidationState {
+public:
+    MOCK_METHOD5(DoS, bool(int level, bool ret,
+             unsigned char chRejectCodeIn, std::string strRejectReasonIn,
+             bool corruptionIn));
+    MOCK_METHOD1(SetPerformPourVerification, bool(bool pourVerifyIn));
+    MOCK_METHOD0(PerformPourVerification, bool());
+    MOCK_METHOD3(Invalid, bool(bool ret,
+                 unsigned char _chRejectCode, std::string _strRejectReason));
+    MOCK_METHOD1(Error, bool(std::string strRejectReasonIn));
+    MOCK_CONST_METHOD0(IsValid, bool());
+    MOCK_CONST_METHOD0(IsInvalid, bool());
+    MOCK_CONST_METHOD0(IsError, bool());
+    MOCK_CONST_METHOD1(IsInvalid, bool(int &nDoSOut));
+    MOCK_CONST_METHOD0(CorruptionPossible, bool());
+    MOCK_CONST_METHOD0(GetRejectCode, unsigned char());
+    MOCK_CONST_METHOD0(GetRejectReason, std::string());
+};
+
+TEST(checktransaction_tests, mock_proof_of_concept) {
+    CTransaction tx;
+    MockCValidationState state;
+    EXPECT_CALL(state, DoS(10, false, REJECT_INVALID, "bad-txns-vin-empty", false)).Times(1);
+    CheckTransaction(tx, state);
+}