diff --git a/tests/core/counter.t.cpp b/tests/core/counter.t.cpp
new file mode 100644
index 0000000..310e589
--- /dev/null
+++ b/tests/core/counter.t.cpp
@@ -0,0 +1,87 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/**
+ * Copyright (c) 2014-2015,  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 NFD (Named Data Networking Forwarding Daemon).
+ * See AUTHORS.md for complete list of NFD authors and contributors.
+ *
+ * NFD is free software: you can redistribute it and/or modify it under the terms
+ * of the GNU General Public License as published by the Free Software Foundation,
+ * either version 3 of the License, or (at your option) any later version.
+ *
+ * NFD 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * NFD, e.g., in COPYING.md file.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "core/counter.hpp"
+
+#include "tests/test-common.hpp"
+
+namespace nfd {
+namespace tests {
+
+BOOST_FIXTURE_TEST_SUITE(TestCounter, BaseFixture)
+
+BOOST_AUTO_TEST_CASE(PacketCnt)
+{
+  PacketCounter counter;
+
+  uint64_t observation = counter; // implicit conversion
+  BOOST_CHECK_EQUAL(observation, 0);
+
+  ++counter;
+  BOOST_CHECK_EQUAL(counter, 1);
+  ++counter;
+  ++counter;
+  BOOST_CHECK_EQUAL(counter, 3);
+
+  counter.set(2);
+  BOOST_CHECK_EQUAL(counter, 2);
+}
+
+BOOST_AUTO_TEST_CASE(ByteCnt)
+{
+  ByteCounter counter;
+
+  uint64_t observation = counter; // implicit conversion
+  BOOST_CHECK_EQUAL(observation, 0);
+
+  counter += 20;
+  BOOST_CHECK_EQUAL(counter, 20);
+  counter += 80;
+  counter += 90;
+  BOOST_CHECK_EQUAL(counter, 190);
+
+  counter.set(21);
+  BOOST_CHECK_EQUAL(counter, 21);
+}
+
+BOOST_AUTO_TEST_CASE(SizeCnt)
+{
+  std::vector<int> v;
+  SizeCounter<std::vector<int>> counter(v);
+
+  size_t observation = counter; // implicit conversion
+  BOOST_CHECK_EQUAL(observation, 0);
+
+  v.resize(249);
+  BOOST_CHECK_EQUAL(counter, 249);
+
+  v.resize(98);
+  BOOST_CHECK_EQUAL(counter, 98);
+}
+
+BOOST_AUTO_TEST_SUITE_END() // TestCounter
+
+} // namespace tests
+} // namespace nfd
diff --git a/tests/daemon/face/dummy-transport.hpp b/tests/daemon/face/dummy-transport.hpp
index 0e76d47..6d1451c 100644
--- a/tests/daemon/face/dummy-transport.hpp
+++ b/tests/daemon/face/dummy-transport.hpp
@@ -43,7 +43,8 @@
                  const std::string& remoteUri = "dummy://",
                  ndn::nfd::FaceScope scope = ndn::nfd::FACE_SCOPE_NON_LOCAL,
                  ndn::nfd::FacePersistency persistency = ndn::nfd::FACE_PERSISTENCY_PERSISTENT,
-                 ndn::nfd::LinkType linkType = ndn::nfd::LINK_TYPE_POINT_TO_POINT)
+                 ndn::nfd::LinkType linkType = ndn::nfd::LINK_TYPE_POINT_TO_POINT,
+                 ssize_t mtu = MTU_UNLIMITED)
     : isClosed(false)
   {
     this->setLocalUri(FaceUri(localUri));
@@ -51,7 +52,7 @@
     this->setScope(scope);
     this->setPersistency(persistency);
     this->setLinkType(linkType);
-    this->setMtu(MTU_UNLIMITED);
+    this->setMtu(mtu);
   }
 
   void
diff --git a/tests/daemon/face/face-counters.t.cpp b/tests/daemon/face/face-counters.t.cpp
index 2d56113..949ac5b 100644
--- a/tests/daemon/face/face-counters.t.cpp
+++ b/tests/daemon/face/face-counters.t.cpp
@@ -33,34 +33,6 @@
 
 BOOST_FIXTURE_TEST_SUITE(FaceFaceCounters, BaseFixture)
 
-BOOST_AUTO_TEST_CASE(PacketCnt)
-{
-  PacketCounter counter;
-
-  uint64_t observation = counter;//implicit convertible
-  BOOST_CHECK_EQUAL(observation, 0);
-
-  ++counter;
-  BOOST_CHECK_EQUAL(static_cast<int>(counter), 1);
-  ++counter;
-  ++counter;
-  BOOST_CHECK_EQUAL(static_cast<int>(counter), 3);
-}
-
-BOOST_AUTO_TEST_CASE(ByteCnt)
-{
-  ByteCounter counter;
-
-  uint64_t observation = counter;//implicit convertible
-  BOOST_CHECK_EQUAL(observation, 0);
-
-  counter += 20;
-  BOOST_CHECK_EQUAL(static_cast<int>(counter), 20);
-  counter += 80;
-  counter += 90;
-  BOOST_CHECK_EQUAL(static_cast<int>(counter), 190);
-}
-
 BOOST_AUTO_TEST_CASE(Counters)
 {
   DummyFace face;
diff --git a/tests/daemon/face/transport.t.cpp b/tests/daemon/face/transport.t.cpp
new file mode 100644
index 0000000..ae6a9c1
--- /dev/null
+++ b/tests/daemon/face/transport.t.cpp
@@ -0,0 +1,256 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/**
+ * Copyright (c) 2014-2015,  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 NFD (Named Data Networking Forwarding Daemon).
+ * See AUTHORS.md for complete list of NFD authors and contributors.
+ *
+ * NFD is free software: you can redistribute it and/or modify it under the terms
+ * of the GNU General Public License as published by the Free Software Foundation,
+ * either version 3 of the License, or (at your option) any later version.
+ *
+ * NFD 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * NFD, e.g., in COPYING.md file.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "face/transport.hpp"
+#include "face/lp-face.hpp"
+#include "dummy-transport.hpp"
+#include "dummy-receive-link-service.hpp"
+#include "transport-properties.hpp"
+
+#include <boost/mpl/empty_sequence.hpp>
+#include <boost/mpl/int.hpp>
+#include <boost/mpl/joint_view.hpp>
+#include <boost/mpl/map.hpp>
+#include <boost/mpl/set.hpp>
+#include <boost/mpl/transform_view.hpp>
+
+#include "tests/test-common.hpp"
+
+namespace nfd {
+namespace face {
+namespace tests {
+
+using namespace nfd::tests;
+namespace ip = boost::asio::ip;
+
+BOOST_AUTO_TEST_SUITE(Face)
+
+class DummyTransportFixture : public BaseFixture
+{
+public:
+  DummyTransportFixture()
+    : transport(nullptr)
+    , sentPackets(nullptr)
+    , receivedPackets(nullptr)
+  {
+    // Constructor does not initialize the fixture,
+    // so that test case may specify different parameters to DummyTransport constructor.
+  }
+
+  void
+  initialize(unique_ptr<DummyTransport> transport = make_unique<DummyTransport>())
+  {
+    this->face = make_unique<LpFace>(make_unique<DummyReceiveLinkService>(), std::move(transport));
+    this->transport = static_cast<DummyTransport*>(face->getTransport());
+    this->sentPackets = &this->transport->sentPackets;
+    this->receivedPackets = &static_cast<DummyReceiveLinkService*>(face->getLinkService())->receivedPackets;
+  }
+
+public:
+  unique_ptr<LpFace> face;
+  DummyTransport* transport;
+  std::vector<Transport::Packet>* sentPackets;
+  std::vector<Transport::Packet>* receivedPackets;
+};
+
+BOOST_FIXTURE_TEST_SUITE(TestTransport, DummyTransportFixture)
+
+BOOST_AUTO_TEST_CASE(DummyTransportStaticProperties)
+{
+  this->initialize();
+  checkStaticPropertiesInitialized(*transport);
+}
+
+BOOST_AUTO_TEST_SUITE(StateTransition)
+
+namespace mpl = boost::mpl;
+
+/** \brief a macro to declare a TransportState as a integral constant
+ */
+#define TRANSPORT_STATE_C(X) mpl::int_<static_cast<int>(TransportState::X)>
+
+/** \brief a map from every TransportState to a valid state transition sequence
+ *         for entering this state from UP
+ */
+typedef mpl::map<
+  mpl::pair<TRANSPORT_STATE_C(UP),
+    mpl::vector<>>,
+  mpl::pair<TRANSPORT_STATE_C(DOWN),
+    mpl::vector<
+      TRANSPORT_STATE_C(DOWN)
+    >>,
+  mpl::pair<TRANSPORT_STATE_C(CLOSING),
+    mpl::vector<
+      TRANSPORT_STATE_C(CLOSING)
+    >>,
+  mpl::pair<TRANSPORT_STATE_C(FAILED),
+    mpl::vector<
+      TRANSPORT_STATE_C(FAILED)
+    >>,
+  mpl::pair<TRANSPORT_STATE_C(CLOSED),
+    mpl::vector<
+      TRANSPORT_STATE_C(CLOSING),
+      TRANSPORT_STATE_C(CLOSED)
+    >>
+> StateEntering;
+
+/** \brief a sequence of all valid TransportStates
+ */
+typedef mpl::fold<StateEntering,
+  mpl::vector<>,
+  mpl::push_back<mpl::_1, mpl::first<mpl::_2>>
+>::type States;
+
+/** \brief a set of all valid state transitions
+ */
+typedef mpl::set<
+  mpl::pair<TRANSPORT_STATE_C(UP), TRANSPORT_STATE_C(DOWN)>,
+  mpl::pair<TRANSPORT_STATE_C(DOWN), TRANSPORT_STATE_C(UP)>,
+  mpl::pair<TRANSPORT_STATE_C(UP), TRANSPORT_STATE_C(CLOSING)>,
+  mpl::pair<TRANSPORT_STATE_C(UP), TRANSPORT_STATE_C(FAILED)>,
+  mpl::pair<TRANSPORT_STATE_C(DOWN), TRANSPORT_STATE_C(CLOSING)>,
+  mpl::pair<TRANSPORT_STATE_C(DOWN), TRANSPORT_STATE_C(FAILED)>,
+  mpl::pair<TRANSPORT_STATE_C(CLOSING), TRANSPORT_STATE_C(CLOSED)>,
+  mpl::pair<TRANSPORT_STATE_C(FAILED), TRANSPORT_STATE_C(CLOSED)>
+> ValidStateTransitions;
+
+/** \brief a metafunction class to generate a sequence of all state transitions
+ *         from a specified state
+ */
+struct StateTransitionsFrom
+{
+  template<typename FROM>
+  struct apply
+  {
+    typedef typename mpl::fold<
+      States,
+      mpl::vector<>,
+      mpl::push_back<mpl::_1, mpl::pair<FROM, mpl::_2>>
+    >::type type;
+  };
+};
+
+/** \brief a sequence of all state transitions
+ */
+typedef mpl::fold<
+  States,
+  mpl::empty_sequence,
+  mpl::joint_view<mpl::_1, mpl::apply<StateTransitionsFrom, mpl::protect<mpl::_1>>::type>
+>::type AllStateTransitions;
+
+#undef TRANSPORT_STATE_C
+
+BOOST_AUTO_TEST_CASE_TEMPLATE(SetState, T, AllStateTransitions)
+{
+  this->initialize();
+
+  TransportState from = static_cast<TransportState>(T::first::value);
+  TransportState to = static_cast<TransportState>(T::second::value);
+  BOOST_TEST_MESSAGE("SetState " << from << " -> " << to);
+
+  // enter from state
+  typedef typename mpl::at<StateEntering, mpl::int_<T::first::value>>::type Steps;
+  mpl::for_each<Steps>(
+    [this] (int state) { transport->setState(static_cast<TransportState>(state)); });
+  BOOST_REQUIRE_EQUAL(transport->getState(), from);
+
+  bool hasSignal = false;
+  this->transport->afterStateChange.connect(
+    [from, to, &hasSignal] (TransportState oldState, TransportState newState) {
+      hasSignal = true;
+      BOOST_CHECK_EQUAL(oldState, from);
+      BOOST_CHECK_EQUAL(newState, to);
+    });
+
+  // do transition
+  bool isValid = from == to ||
+                 mpl::has_key<ValidStateTransitions,
+                   mpl::pair<mpl::int_<T::first::value>, mpl::int_<T::second::value>>
+                 >::value;
+  if (isValid) {
+    BOOST_REQUIRE_NO_THROW(transport->setState(to));
+    BOOST_CHECK_EQUAL(hasSignal, from != to);
+  }
+  else {
+    BOOST_CHECK_THROW(this->transport->setState(to), std::runtime_error);
+  }
+}
+
+BOOST_AUTO_TEST_SUITE_END() // StateTransition
+
+BOOST_AUTO_TEST_CASE(Send)
+{
+  this->initialize();
+
+  Block pkt1 = ndn::encoding::makeStringBlock(300, "Lorem ipsum dolor sit amet,");
+  transport->send(Transport::Packet(Block(pkt1)));
+
+  Block pkt2 = ndn::encoding::makeStringBlock(301, "consectetur adipiscing elit,");
+  transport->send(Transport::Packet(Block(pkt2)));
+
+  transport->setState(TransportState::DOWN);
+  Block pkt3 = ndn::encoding::makeStringBlock(302, "sed do eiusmod tempor incididunt ");
+  transport->send(Transport::Packet(Block(pkt3)));
+
+  transport->setState(TransportState::CLOSING);
+  Block pkt4 = ndn::encoding::makeStringBlock(303, "ut labore et dolore magna aliqua.");
+  transport->send(Transport::Packet(Block(pkt4)));
+
+  BOOST_CHECK_EQUAL(transport->getCounters().nOutPackets, 2);
+  BOOST_CHECK_EQUAL(transport->getCounters().nOutBytes, pkt1.size() + pkt2.size());
+  BOOST_REQUIRE_EQUAL(sentPackets->size(), 3);
+  BOOST_CHECK(sentPackets->at(0).packet == pkt1);
+  BOOST_CHECK(sentPackets->at(1).packet == pkt2);
+  BOOST_CHECK(sentPackets->at(2).packet == pkt3);
+}
+
+BOOST_AUTO_TEST_CASE(Receive)
+{
+  this->initialize();
+
+  Block pkt1 = ndn::encoding::makeStringBlock(300, "Lorem ipsum dolor sit amet,");
+  transport->receivePacket(pkt1);
+
+  Block pkt2 = ndn::encoding::makeStringBlock(301, "consectetur adipiscing elit,");
+  transport->receivePacket(pkt2);
+
+  transport->setState(TransportState::DOWN);
+  Block pkt3 = ndn::encoding::makeStringBlock(302, "sed do eiusmod tempor incididunt ");
+  transport->receivePacket(pkt3);
+
+  BOOST_CHECK_EQUAL(transport->getCounters().nInPackets, 3);
+  BOOST_CHECK_EQUAL(transport->getCounters().nInBytes, pkt1.size() + pkt2.size() + pkt3.size());
+  BOOST_REQUIRE_EQUAL(receivedPackets->size(), 3);
+  BOOST_CHECK(receivedPackets->at(0).packet == pkt1);
+  BOOST_CHECK(receivedPackets->at(1).packet == pkt2);
+  BOOST_CHECK(receivedPackets->at(2).packet == pkt3);
+}
+
+BOOST_AUTO_TEST_SUITE_END() // TestTransport
+BOOST_AUTO_TEST_SUITE_END() // Face
+
+} // namespace tests
+} // namespace face
+} // namespace nfd
diff --git a/tests/daemon/face/websocket-transport.t.cpp b/tests/daemon/face/websocket-transport.t.cpp
index f4115bc..8c295ba 100644
--- a/tests/daemon/face/websocket-transport.t.cpp
+++ b/tests/daemon/face/websocket-transport.t.cpp
@@ -234,6 +234,8 @@
   BOOST_CHECK_EQUAL(limitedIo.run(2, // clientHandlePing, serverHandlePong
                     time::milliseconds(1500)), LimitedIo::EXCEED_OPS);
   BOOST_CHECK_EQUAL(transport->getState(), TransportState::UP);
+  BOOST_CHECK_EQUAL(transport->getCounters().nOutPings, 1);
+  BOOST_CHECK_EQUAL(transport->getCounters().nInPongs, 1);
 
   this->clientShouldPong = false;
   BOOST_CHECK_EQUAL(limitedIo.run(2, // clientHandlePing, serverHandlePongTimeout
@@ -241,6 +243,8 @@
   BOOST_CHECK_MESSAGE(transport->getState() == TransportState::FAILED ||
                       transport->getState() == TransportState::CLOSED,
                       "expect FAILED or CLOSED state, actual state=" << transport->getState());
+  BOOST_CHECK_EQUAL(transport->getCounters().nOutPings, 2);
+  BOOST_CHECK_EQUAL(transport->getCounters().nInPongs, 1);
 }
 
 BOOST_AUTO_TEST_CASE(Send)