diff --git a/tests/unit/security/transform.t.cpp b/tests/unit/security/transform.t.cpp
new file mode 100644
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--- /dev/null
+++ b/tests/unit/security/transform.t.cpp
@@ -0,0 +1,86 @@
+/* -*- 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 "security/transform.hpp"
+
+#include "boost-test.hpp"
+
+namespace ndn {
+namespace security {
+namespace tests {
+
+BOOST_AUTO_TEST_SUITE(Security)
+BOOST_AUTO_TEST_SUITE(TestTransform)
+
+BOOST_AUTO_TEST_CASE(SymbolVisibility)
+{
+  transform::BufferSource* bufferSource = nullptr;
+  BOOST_CHECK(bufferSource == nullptr);
+
+  transform::StreamSource* streamSource = nullptr;
+  BOOST_CHECK(streamSource == nullptr);
+
+  transform::StepSource* stepSource = nullptr;
+  BOOST_CHECK(stepSource == nullptr);
+
+  transform::BoolSink* boolSink = nullptr;
+  BOOST_CHECK(boolSink == nullptr);
+
+  transform::StreamSink* streamSink = nullptr;
+  BOOST_CHECK(streamSink == nullptr);
+
+  transform::HexEncode* hexEncode = nullptr;
+  BOOST_CHECK(hexEncode == nullptr);
+
+  transform::StripSpace* stripSpace = nullptr;
+  BOOST_CHECK(stripSpace == nullptr);
+
+  transform::HexDecode* hexDecode = nullptr;
+  BOOST_CHECK(hexDecode == nullptr);
+
+  transform::Base64Encode* base64Encode = nullptr;
+  BOOST_CHECK(base64Encode == nullptr);
+
+  transform::Base64Decode* base64Decode = nullptr;
+  BOOST_CHECK(base64Decode == nullptr);
+
+  transform::DigestFilter* digestFilter = nullptr;
+  BOOST_CHECK(digestFilter == nullptr);
+
+  transform::HmacFilter* hmacFilter = nullptr;
+  BOOST_CHECK(hmacFilter == nullptr);
+
+  transform::BlockCipher* blockCipher = nullptr;
+  BOOST_CHECK(blockCipher == nullptr);
+
+  transform::SignerFilter* signerFilter = nullptr;
+  BOOST_CHECK(signerFilter == nullptr);
+
+  transform::VerifierFilter* verifierFilter = nullptr;
+  BOOST_CHECK(verifierFilter == nullptr);
+}
+
+BOOST_AUTO_TEST_SUITE_END() // TestTransform
+BOOST_AUTO_TEST_SUITE_END() // Security
+
+} // namespace tests
+} // namespace security
+} // namespace ndn