diff --git a/tests/unit/util/simple-notification.hpp b/tests/unit/util/simple-notification.hpp
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+++ b/tests/unit/util/simple-notification.hpp
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+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/*
+ * Copyright (c) 2014-2018 Regents of the University of California,
+ *                         Arizona Board of Regents,
+ *                         Colorado State University,
+ *                         University Pierre & Marie Curie, Sorbonne University,
+ *                         Washington University in St. Louis,
+ *                         Beijing Institute of Technology,
+ *                         The University of Memphis.
+ *
+ * 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.
+ */
+
+#ifndef NDN_TESTS_UNIT_TESTS_UTIL_SIMPLE_NOTIFICATION_HPP
+#define NDN_TESTS_UNIT_TESTS_UTIL_SIMPLE_NOTIFICATION_HPP
+
+#include "common.hpp"
+
+#include "encoding/encoding-buffer.hpp"
+
+namespace ndn {
+namespace util {
+namespace tests {
+
+class SimpleNotification
+{
+public:
+  SimpleNotification() = default;
+
+  explicit
+  SimpleNotification(const Block& block)
+  {
+    wireDecode(block);
+  }
+
+  SimpleNotification(const std::string& message)
+    : m_message(message)
+  {
+  }
+
+  Block
+  wireEncode() const
+  {
+    ndn::EncodingBuffer buffer;
+    buffer.prependByteArrayBlock(0x8888,
+                                 reinterpret_cast<const uint8_t*>(m_message.c_str()),
+                                 m_message.size());
+    return buffer.block();
+  }
+
+  void
+  wireDecode(const Block& block)
+  {
+    m_message.assign(reinterpret_cast<const char*>(block.value()),
+                     block.value_size());
+
+    // error for testing
+    if (!m_message.empty() && m_message[0] == '\x07')
+      BOOST_THROW_EXCEPTION(tlv::Error("0x07 error"));
+  }
+
+  const std::string&
+  getMessage() const
+  {
+    return m_message;
+  }
+
+  void
+  setMessage(const std::string& message)
+  {
+    m_message = message;
+  }
+
+private:
+  std::string m_message;
+};
+
+} // namespace tests
+} // namespace util
+} // namespace ndn
+
+#endif // NDN_TESTS_UNIT_TESTS_UTIL_SIMPLE_NOTIFICATION_HPP