diff --git a/libethereum/BlockChain.cpp b/libethereum/BlockChain.cpp
index d8dbd266f..be3449a60 100644
--- a/libethereum/BlockChain.cpp
+++ b/libethereum/BlockChain.cpp
@@ -273,7 +273,7 @@ void BlockChain::rebuild(std::string const& _path, std::function<void(unsigned,
 
 	h256 lastHash = m_lastBlockHash;
 	Timer t;
-	for (unsigned d = 1; d < originalNumber; ++d)
+	for (unsigned d = 1; d <= originalNumber; ++d)
 	{
 		if (!(d % 1000))
 		{
diff --git a/test/libdevcore/core.cpp b/test/libdevcore/core.cpp
new file mode 100644
index 000000000..e7c7c86a1
--- /dev/null
+++ b/test/libdevcore/core.cpp
@@ -0,0 +1,41 @@
+/*
+	This file is part of cpp-ethereum.
+
+	cpp-ethereum is free software: you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+
+	cpp-ethereum is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with cpp-ethereum.  If not, see <http://www.gnu.org/licenses/>.
+*/
+/** @file core.cpp
+ * @author Dimitry Khokhlov <winsvega@mail.ru>
+ * @date 2014
+ * CORE test functions.
+ */
+
+#include <boost/test/unit_test.hpp>
+#include <libdevcore/CommonIO.h>
+#include <test/TestHelper.h>
+
+BOOST_AUTO_TEST_SUITE(CoreLibTests)
+
+BOOST_AUTO_TEST_CASE(byteRef)
+{	
+	cnote << "bytesRef copyTo and toString...";
+	dev::bytes originalSequence = dev::fromHex("0102030405060708091011121314151617181920212223242526272829303132");
+	dev::bytesRef out(&originalSequence.at(0), 32);
+	dev::h256 hash32("1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347");
+	hash32.ref().copyTo(out);
+
+	BOOST_CHECK_MESSAGE(out.size() == 32, "Error wrong result size when h256::ref().copyTo(dev::bytesRef out)");
+	BOOST_CHECK_MESSAGE(out.toBytes() == originalSequence, "Error when h256::ref().copyTo(dev::bytesRef out)");
+}
+
+BOOST_AUTO_TEST_SUITE_END()