Testing environment

Change-Id: I431214b62e7cc8793db80a05fe854849b4c6df5b
diff --git a/tests/dummy-forwarder.cpp b/tests/dummy-forwarder.cpp
new file mode 100644
index 0000000..ff34fb2
--- /dev/null
+++ b/tests/dummy-forwarder.cpp
@@ -0,0 +1,72 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/**
+ * Copyright (c) 2014-2018, Regents of the University of California
+ *
+ * NAC 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.
+ *
+ * NAC 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 NAC library authors and contributors.
+ */
+
+#include "dummy-forwarder.hpp"
+
+#include <boost/asio/io_service.hpp>
+
+namespace ndn {
+namespace nac {
+namespace tests {
+
+DummyForwarder::DummyForwarder(boost::asio::io_service& io, KeyChain& keyChain)
+  : m_io(io)
+  , m_keyChain(keyChain)
+{
+}
+
+Face&
+DummyForwarder::addFace()
+{
+  auto face = std::make_shared<util::DummyClientFace>(m_io, m_keyChain, util::
+                                                      DummyClientFace::Options{true, true});
+  face->onSendInterest.connect([this, face] (const Interest& interest) {
+      for (auto& otherFace : m_faces) {
+        if (&*face == &*otherFace) {
+          continue;
+        }
+        otherFace->receive(interest);
+      }
+    });
+
+  face->onSendData.connect([this, face] (const Data& data) {
+      for (auto& otherFace : m_faces) {
+        if (&*face == &*otherFace) {
+          continue;
+        }
+        otherFace->receive(data);
+      }
+    });
+
+  face->onSendNack.connect([this, face] (const lp::Nack& nack) {
+      for (auto& otherFace : m_faces) {
+        if (&*face == &*otherFace) {
+          continue;
+        }
+        otherFace->receive(nack);
+      }
+    });
+
+  m_faces.push_back(face);
+  return *face;
+}
+
+} // namespace tests
+} // namespace nac
+} // namespace ndn