diff --git a/tests/daemon/face/dummy-link-service.hpp b/tests/daemon/face/dummy-link-service.hpp
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+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/*
+ * Copyright (c) 2014-2019,  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 NFD (Named Data Networking Forwarding Daemon).
+ * See AUTHORS.md for complete list of NFD authors and contributors.
+ *
+ * NFD 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.
+ *
+ * NFD 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
+ * NFD, e.g., in COPYING.md file.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef NFD_TESTS_DAEMON_FACE_DUMMY_LINK_SERVICE_HPP
+#define NFD_TESTS_DAEMON_FACE_DUMMY_LINK_SERVICE_HPP
+
+#include "face/link-service.hpp"
+
+namespace nfd {
+namespace face {
+namespace tests {
+
+enum PacketLoggingFlags : unsigned {
+  LogNothing          = 0,      ///< disable packet logging
+  LogSentInterests    = 1 << 0, ///< log sent Interest packets
+  LogSentData         = 1 << 1, ///< log sent Data packets
+  LogSentNacks        = 1 << 2, ///< log sent Nack packets
+  LogSentPackets      = LogSentInterests | LogSentData | LogSentNacks, ///< log all sent packets
+  LogReceivedPackets  = 1 << 3, ///< log all received packets (as Transport::Packet)
+  LogAllPackets       = LogSentPackets | LogReceivedPackets, ///< log all sent and received packets
+};
+
+/** \brief A dummy LinkService that logs all sent and received packets.
+ */
+class DummyLinkService final : public LinkService
+{
+public:
+  /** \brief Emitted after a network-layer packet is sent through this link service.
+   *
+   *  The packet type is reported via the argument, whose value will be one of
+   *  tlv::Interest, tlv::Data, or lp::tlv::Nack. Signal handlers may retrieve
+   *  the packet via `sentInterests.back()`, `sentData.back()`, or `sentNacks.back()`.
+   */
+  signal::Signal<DummyLinkService, uint32_t> afterSend;
+
+  using LinkService::receiveInterest;
+  using LinkService::receiveData;
+  using LinkService::receiveNack;
+
+  void
+  setPacketLogging(std::underlying_type_t<PacketLoggingFlags> flags)
+  {
+    m_loggingFlags = static_cast<PacketLoggingFlags>(flags);
+  }
+
+private:
+  void
+  doSendInterest(const Interest& interest) final;
+
+  void
+  doSendData(const Data& data) final;
+
+  void
+  doSendNack(const lp::Nack& nack) final;
+
+  void
+  doReceivePacket(Transport::Packet&& packet) final;
+
+public:
+  std::vector<Interest> sentInterests;
+  std::vector<Data> sentData;
+  std::vector<lp::Nack> sentNacks;
+  std::vector<Transport::Packet> receivedPackets;
+
+private:
+  PacketLoggingFlags m_loggingFlags = LogAllPackets;
+};
+
+} // namespace tests
+} // namespace face
+} // namespace nfd
+
+#endif // NFD_TESTS_DAEMON_FACE_DUMMY_LINK_SERVICE_HPP