Introduce Delegation and DelegationList

DelegationList will become the payload structure of ForwardingHint
and LinkContent in a later commit.

refs #4055

Change-Id: If29a39c47b779aafdd4aebb104092403f28e6653
diff --git a/tests/unit-tests/delegation.t.cpp b/tests/unit-tests/delegation.t.cpp
new file mode 100644
index 0000000..f15f578
--- /dev/null
+++ b/tests/unit-tests/delegation.t.cpp
@@ -0,0 +1,64 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/**
+ * Copyright (c) 2013-2017 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.
+ */
+
+#include "delegation.hpp"
+
+#include "boost-test.hpp"
+#include <boost/lexical_cast.hpp>
+
+namespace ndn {
+namespace tests {
+
+BOOST_AUTO_TEST_SUITE(TestDelegation)
+
+BOOST_AUTO_TEST_CASE(Compare)
+{
+  BOOST_CHECK_EQUAL((Delegation{1, "/A"}), (Delegation{1, "/A"}));
+  BOOST_CHECK_LE((Delegation{1, "/A"}), (Delegation{1, "/A"}));
+  BOOST_CHECK_GE((Delegation{1, "/A"}), (Delegation{1, "/A"}));
+
+  BOOST_CHECK_NE((Delegation{1, "/A"}), (Delegation{2, "/A"}));
+  BOOST_CHECK_NE((Delegation{1, "/A"}), (Delegation{1, "/B"}));
+
+  BOOST_CHECK_LT((Delegation{1, "/A"}), (Delegation{1, "/B"}));
+  BOOST_CHECK_LE((Delegation{1, "/A"}), (Delegation{1, "/B"}));
+  BOOST_CHECK_LT((Delegation{1, "/B"}), (Delegation{2, "/A"}));
+  BOOST_CHECK_LE((Delegation{1, "/B"}), (Delegation{2, "/A"}));
+  BOOST_CHECK_LT((Delegation{1, "/A"}), (Delegation{2, "/A"}));
+  BOOST_CHECK_LE((Delegation{1, "/A"}), (Delegation{2, "/A"}));
+
+  BOOST_CHECK_GT((Delegation{1, "/B"}), (Delegation{1, "/A"}));
+  BOOST_CHECK_GE((Delegation{1, "/B"}), (Delegation{1, "/A"}));
+  BOOST_CHECK_GT((Delegation{2, "/A"}), (Delegation{1, "/B"}));
+  BOOST_CHECK_GE((Delegation{2, "/A"}), (Delegation{1, "/B"}));
+  BOOST_CHECK_GT((Delegation{2, "/A"}), (Delegation{1, "/A"}));
+  BOOST_CHECK_GE((Delegation{2, "/A"}), (Delegation{1, "/A"}));
+}
+
+BOOST_AUTO_TEST_CASE(Print)
+{
+  BOOST_CHECK_EQUAL(boost::lexical_cast<std::string>(Delegation{1, "/B"}), "/B(1)");
+}
+
+BOOST_AUTO_TEST_SUITE_END() // TestDelegation
+
+} // namespace tests
+} // namespace ndn