diff --git a/tests/unit-tests/net/collect-netifs.hpp b/tests/unit-tests/net/collect-netifs.hpp
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+++ b/tests/unit-tests/net/collect-netifs.hpp
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+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/*
+ * Copyright (c) 2013-2017 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 NFD_TESTS_UNIT_TESTS_NET_COLLECT_NETIFS_HPP
+#define NFD_TESTS_UNIT_TESTS_NET_COLLECT_NETIFS_HPP
+
+#include "common.hpp"
+#include "net/network-interface.hpp"
+
+#include <vector>
+
+namespace ndn {
+namespace net {
+namespace tests {
+
+/** \brief Collect information about network interfaces
+ *  \param allowCached if true, previously collected information can be returned
+ *  \note This function is blocking if \p allowCached is false or no previous information exists
+ *  \throw ndn::net::NetworkMonitor::Error NetworkMonitor::CAP_ENUM is unavailable
+ */
+std::vector<shared_ptr<const NetworkInterface>>
+collectNetworkInterfaces(bool allowCached = true);
+
+} // namespace tests
+} // namespace net
+} // namespace ndn
+
+#endif // NFD_TESTS_UNIT_TESTS_NET_COLLECT_NETIFS_HPP