diff --git a/tests/unit/encoding/buffer-stream.t.cpp b/tests/unit/encoding/buffer-stream.t.cpp
new file mode 100644
index 0000000..9c95b2c
--- /dev/null
+++ b/tests/unit/encoding/buffer-stream.t.cpp
@@ -0,0 +1,77 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/*
+ * Copyright (c) 2013-2018 Regents of the University of California.
+ *
+ * This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
+ *
+ * ndn-cxx library is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU Lesser General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later version.
+ *
+ * ndn-cxx library 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 Lesser General Public License for more details.
+ *
+ * You should have received copies of the GNU General Public License and GNU Lesser
+ * General Public License along with ndn-cxx, e.g., in COPYING.md file.  If not, see
+ * <http://www.gnu.org/licenses/>.
+ *
+ * See AUTHORS.md for complete list of ndn-cxx authors and contributors.
+ */
+
+#include "encoding/buffer-stream.hpp"
+
+#include "boost-test.hpp"
+
+namespace ndn {
+namespace tests {
+
+BOOST_AUTO_TEST_SUITE(Encoding)
+BOOST_AUTO_TEST_SUITE(TestBufferStream)
+
+BOOST_AUTO_TEST_CASE(Empty)
+{
+  OBufferStream os;
+
+  shared_ptr<Buffer> buf = os.buf();
+  BOOST_CHECK_EQUAL(buf->size(), 0);
+}
+
+BOOST_AUTO_TEST_CASE(Put)
+{
+  OBufferStream os;
+  os.put(0x33);
+  os.put(0x44);
+
+  shared_ptr<Buffer> buf = os.buf();
+  BOOST_REQUIRE_EQUAL(buf->size(), 2);
+  BOOST_CHECK_EQUAL(buf->at(0), 0x33);
+  BOOST_CHECK_EQUAL(buf->at(1), 0x44);
+}
+
+BOOST_AUTO_TEST_CASE(Write)
+{
+  OBufferStream os;
+  os.write("\x11\x22", 2);
+
+  shared_ptr<Buffer> buf = os.buf();
+  BOOST_REQUIRE_EQUAL(buf->size(), 2);
+  BOOST_CHECK_EQUAL(buf->at(0), 0x11);
+  BOOST_CHECK_EQUAL(buf->at(1), 0x22);
+}
+
+BOOST_AUTO_TEST_CASE(Destructor) // Bug 3727
+{
+  auto os = make_unique<OBufferStream>();
+  *os << 'x';
+  os.reset(); // should not cause use-after-free
+
+  // avoid "test case [...] did not check any assertions" message from Boost.Test
+  BOOST_CHECK(true);
+}
+
+BOOST_AUTO_TEST_SUITE_END() // TestBufferStream
+BOOST_AUTO_TEST_SUITE_END() // Encoding
+
+} // namespace tests
+} // namespace ndn