diff --git a/test/TestHelper.cpp b/test/TestHelper.cpp
index befd571ea..9ac64107d 100644
--- a/test/TestHelper.cpp
+++ b/test/TestHelper.cpp
@@ -181,46 +181,35 @@ void ImportTest::exportTest(bytes const& _output, State const& _statePost)
 	m_TestObject["logs"] = exportLog(_statePost.pending().size() ? _statePost.log(0) : LogEntries());
 
 	// export post state
-	json_spirit::mObject postState;
-
-	for (auto const& a: _statePost.addresses())
-	{
-		json_spirit::mObject o;
-		o["balance"] = toString(_statePost.balance(a.first));
-		o["nonce"] = toString(_statePost.transactionsFrom(a.first));
-		{
-			json_spirit::mObject store;
-			for (auto const& s: _statePost.storage(a.first))
-				store["0x"+toHex(toCompactBigEndian(s.first))] = "0x"+toHex(toCompactBigEndian(s.second));
-			o["storage"] = store;
-		}
-		o["code"] = "0x" + toHex(_statePost.code(a.first));
-
-		postState[toString(a.first)] = o;
-	}
-	m_TestObject["post"] = json_spirit::mValue(postState);
 
+	m_TestObject["post"] = fillJsonWithState(_statePost);
 	m_TestObject["postStateRoot"] = toHex(_statePost.rootHash().asBytes());
 
 	// export pre state
-	json_spirit::mObject preState;
+	m_TestObject["pre"] = fillJsonWithState(m_statePre);
+}
+
+json_spirit::mObject fillJsonWithState(State _state)
+{
+	// export pre state
+	json_spirit::mObject oState;
 
-	for (auto const& a: m_statePre.addresses())
+	for (auto const& a: _state.addresses())
 	{
 		json_spirit::mObject o;
-		o["balance"] = toString(m_statePre.balance(a.first));
-		o["nonce"] = toString(m_statePre.transactionsFrom(a.first));
+		o["balance"] = toString(_state.balance(a.first));
+		o["nonce"] = toString(_state.transactionsFrom(a.first));
 		{
 			json_spirit::mObject store;
-			for (auto const& s: m_statePre.storage(a.first))
+			for (auto const& s: _state.storage(a.first))
 				store["0x"+toHex(toCompactBigEndian(s.first))] = "0x"+toHex(toCompactBigEndian(s.second));
 			o["storage"] = store;
 		}
-		o["code"] = "0x" + toHex(m_statePre.code(a.first));
+		o["code"] = "0x" + toHex(_state.code(a.first));
 
-		preState[toString(a.first)] = o;
+		oState[toString(a.first)] = o;
 	}
-	m_TestObject["pre"] = json_spirit::mValue(preState);
+	return oState;
 }
 
 u256 toInt(json_spirit::mValue const& _v)
diff --git a/test/TestHelper.h b/test/TestHelper.h
index 0f23f945c..d378848a2 100644
--- a/test/TestHelper.h
+++ b/test/TestHelper.h
@@ -117,6 +117,13 @@ private:
 	json_spirit::mObject& m_TestObject;
 };
 
+class ZeroGasPricer: public eth::GasPricer
+{
+protected:
+	u256 ask(eth::State const&) const override { return 0; }
+	u256 bid(eth::TransactionPriority = eth::TransactionPriority::Medium) const override { return 0; }
+};
+
 // helping functions
 u256 toInt(json_spirit::mValue const& _v);
 byte toByte(json_spirit::mValue const& _v);
@@ -136,6 +143,7 @@ void userDefinedTest(std::string testTypeFlag, std::function<void(json_spirit::m
 RLPStream createRLPStreamFromTransactionFields(json_spirit::mObject& _tObj);
 void processCommandLineOptions();
 eth::LastHashes lastHashes(u256 _currentBlockNumber);
+json_spirit::mObject fillJsonWithState(eth::State _state);
 
 template<typename mapType>
 void checkAddresses(mapType& _expectedAddrs, mapType& _resultAddrs)
diff --git a/test/bcUncleTestFiller.json b/test/bcUncleTestFiller.json
index 639051f2b..73d1e5487 100644
--- a/test/bcUncleTestFiller.json
+++ b/test/bcUncleTestFiller.json
@@ -265,23 +265,7 @@
                         "uncleHash" : "1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347"
                     },
                     {
-                        "bloom" : "00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
-                        "coinbase" : "0000000000000000000000000000000000000000",
-                        "difficulty" : "131072",
-                        "extraData" : "0x",
-                        "gasLimit" : "99902343",
-                        "gasUsed" : "0",
-                        "hash" : "9de9879b6a81d1b6c4993c63c90a3c9d1e775f14572694778e828bc64972ae04",
-                        "mixHash" : "b557f905d29ed0fca99d65d0adcce698dee97cf72a13c7cd8d7a7826b8eee770",
-                        "nonce" : "18a524c1790fa83b",
-                        "number" : "2",
-                        "parentHash" : "6134fc6b5d99ee03c4aab1592640f6f9dcbc850668d75d631aee34989b938fae",
-                        "receiptTrie" : "56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421",
-                        "seedHash" : "1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347",
-                        "stateRoot" : "ff640b30d613c35dad43e3693329e1b1ee6350f989cf46a288025a1cbfdab9cd",
-                        "timestamp" : "0x54c98c82",
-                        "transactionsTrie" : "56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421",
-                        "uncleHash" : "1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347"
+                        "sameAsPreviousSibling" : "1"
                     }
                 ]
             }
diff --git a/test/blockchain.cpp b/test/blockchain.cpp
index 0e1128ef9..eca08d09e 100644
--- a/test/blockchain.cpp
+++ b/test/blockchain.cpp
@@ -52,6 +52,7 @@ void doBlockchainTests(json_spirit::mValue& _v, bool _fillin)
 		ImportTest importer(o["pre"].get_obj());
 		State state(Address(), OverlayDB(), BaseState::Empty);
 		importer.importState(o["pre"].get_obj(), state);
+		o["pre"] = fillJsonWithState(state);
 		state.commit();
 
 		if (_fillin)
@@ -87,7 +88,7 @@ void doBlockchainTests(json_spirit::mValue& _v, bool _fillin)
 
 				// get txs
 				TransactionQueue txs;
-				TrivialGasPricer gp;
+				ZeroGasPricer gp;
 				BOOST_REQUIRE(blObj.count("transactions"));
 				for (auto const& txObj: blObj["transactions"].get_array())
 				{
@@ -101,10 +102,18 @@ void doBlockchainTests(json_spirit::mValue& _v, bool _fillin)
 				BlockQueue uncleBlockQueue;
 				mArray aUncleList;
 				vector<BlockInfo> vBiUncles;
+				mObject uncleHeaderObj_pre;
 
 				for (auto const& uHObj: blObj["uncleHeaders"].get_array())
 				{
 					mObject uncleHeaderObj = uHObj.get_obj();
+					if (uncleHeaderObj.count("sameAsPreviousSibling"))
+					{
+						writeBlockHeaderToJson(uncleHeaderObj_pre, vBiUncles[vBiUncles.size()-1]);
+						aUncleList.push_back(uncleHeaderObj_pre);
+						vBiUncles.push_back(vBiUncles[vBiUncles.size()-1]);
+						continue;
+					}
 					BlockInfo uncleBlockFromFields = constructBlock(uncleHeaderObj);
 
 					// make uncle header valid
@@ -123,6 +132,8 @@ void doBlockchainTests(json_spirit::mValue& _v, bool _fillin)
 					cnote << "import uncle in blockQueue";
 					RLPStream uncle = createFullBlockFromHeader(uncleBlockFromFields);
 					uncleBlockQueue.import(&uncle.out(), bc);
+
+					uncleHeaderObj_pre = uncleHeaderObj;
 				}
 
 				blObj["uncleHeaders"] = aUncleList;
@@ -579,6 +590,7 @@ void updatePoW(BlockInfo& _bi)
 		ret = pow.mine(_bi, 10000, true, true); // tie(ret, blockFromFields.nonce)
 		Ethash::assignResult(ret.second, _bi);
 	}
+	_bi.hash = _bi.headerHash(WithNonce);
 }
 
 void writeBlockHeaderToJson(mObject& _o, const BlockInfo& _bi)