Rename 'tests/unit-tests' directory to 'tests/unit'
Change-Id: I78ea29938259fac288781bed12fb2399ac7eba26
diff --git a/tests/unit/net/collect-netifs.cpp b/tests/unit/net/collect-netifs.cpp
new file mode 100644
index 0000000..ca8e6ef
--- /dev/null
+++ b/tests/unit/net/collect-netifs.cpp
@@ -0,0 +1,64 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/*
+ * Copyright (c) 2013-2018 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.
+ */
+
+#include "collect-netifs.hpp"
+#include "net/network-monitor.hpp"
+
+#include <boost/asio/io_service.hpp>
+
+namespace ndn {
+namespace net {
+namespace tests {
+
+std::vector<shared_ptr<const NetworkInterface>>
+collectNetworkInterfaces(bool allowCached)
+{
+ static std::vector<shared_ptr<const NetworkInterface>> cached;
+ // cached.empty() indicates there's no cached list of netifs.
+ // Although it could also mean a system without any network interface, this situation is rare
+ // because the loopback interface is present on almost all systems.
+
+ if (!allowCached || cached.empty()) {
+ boost::asio::io_service io;
+ NetworkMonitor netmon(io);
+ if ((netmon.getCapabilities() & NetworkMonitor::CAP_ENUM) == 0) {
+ BOOST_THROW_EXCEPTION(NetworkMonitor::Error("NetworkMonitor::CAP_ENUM is unavailable"));
+ }
+
+ netmon.onEnumerationCompleted.connect([&io] { io.stop(); });
+ io.run();
+ io.reset();
+
+ cached = netmon.listNetworkInterfaces();
+ }
+
+ return cached;
+}
+
+} // namespace tests
+} // namespace net
+} // namespace ndn