Rename 'tests/unit-tests' directory to 'tests/unit'

Change-Id: I78ea29938259fac288781bed12fb2399ac7eba26
diff --git a/tests/unit/net/network-configuration-detector.hpp b/tests/unit/net/network-configuration-detector.hpp
new file mode 100644
index 0000000..58715c8
--- /dev/null
+++ b/tests/unit/net/network-configuration-detector.hpp
@@ -0,0 +1,75 @@
+/* -*- 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.
+ */
+
+#ifndef NDN_TESTS_NET_NETWORK_CONFIGURATION_DETECTOR_HPP
+#define NDN_TESTS_NET_NETWORK_CONFIGURATION_DETECTOR_HPP
+
+#define SKIP_IF_IPV4_UNAVAILABLE() \
+  do { \
+    if (!::ndn::tests::NetworkConfigurationDetector::hasIpv4()) { \
+      BOOST_WARN_MESSAGE(false, "skipping assertions that require IPv4 support"); \
+      return; \
+    } \
+  } while (false)
+
+#define SKIP_IF_IPV6_UNAVAILABLE() \
+  do { \
+    if (!::ndn::tests::NetworkConfigurationDetector::hasIpv6()) { \
+      BOOST_WARN_MESSAGE(false, "skipping assertions that require IPv6 support"); \
+      return; \
+    } \
+  } while (false)
+
+#define SKIP_IF_IP_UNAVAILABLE() \
+  do { \
+    if (!::ndn::tests::NetworkConfigurationDetector::hasIpv4() && \
+        !::ndn::tests::NetworkConfigurationDetector::hasIpv6()) { \
+      BOOST_WARN_MESSAGE(false, "skipping assertions that require either IPv4 or IPv6 support"); \
+      return; \
+    } \
+  } while (false)
+
+namespace ndn {
+namespace tests {
+
+class NetworkConfigurationDetector
+{
+public:
+  static bool
+  hasIpv4();
+
+  static bool
+  hasIpv6();
+
+private:
+  static void
+  detect();
+
+private:
+  static bool m_isInitialized;
+  static bool m_hasIpv4;
+  static bool m_hasIpv6;
+};
+
+} // namespace tests
+} // namespace ndn
+
+#endif // NDN_TESTS_NET_NETWORK_CONFIGURATION_DETECTOR_HPP