NFD/tests/daemon/fw/ncc-strategy.cpp - ndnSIM - Gitiles

 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
 /**
  * Copyright (c) 2014,  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 "fw/ncc-strategy.hpp"
 #include "strategy-tester.hpp"
 #include "tests/daemon/face/dummy-face.hpp"
 #include "tests/limited-io.hpp"

 #include "tests/test-common.hpp"

 namespace nfd {
 namespace tests {

 BOOST_FIXTURE_TEST_SUITE(FwNccStrategy, UnitTestTimeFixture)

 // NccStrategy is fairly complex.
 // The most important property is:
 // it remembers which upstream is the fastest to return Data,
 // and favors this upstream in subsequent Interests.
 BOOST_AUTO_TEST_CASE(FavorRespondingUpstream)
 {
   LimitedIo limitedIo(this);
   Forwarder forwarder;
   typedef StrategyTester<fw::NccStrategy> NccStrategyTester;
   shared_ptr<NccStrategyTester> strategy = make_shared<NccStrategyTester>(ref(forwarder));
   strategy->onAction.connect(bind(&LimitedIo::afterOp, &limitedIo));

   shared_ptr<DummyFace> face1 = make_shared<DummyFace>();
   shared_ptr<DummyFace> face2 = make_shared<DummyFace>();
   shared_ptr<DummyFace> face3 = make_shared<DummyFace>();
   forwarder.addFace(face1);
   forwarder.addFace(face2);
   forwarder.addFace(face3);

   Fib& fib = forwarder.getFib();
   shared_ptr<fib::Entry> fibEntry = fib.insert(Name()).first;
   fibEntry->addNextHop(face1, 10);
   fibEntry->addNextHop(face2, 20);

   StrategyChoice& strategyChoice = forwarder.getStrategyChoice();
   strategyChoice.install(strategy);
   strategyChoice.insert(Name(), strategy->getName());

   Pit& pit = forwarder.getPit();

   // first Interest: strategy knows nothing and follows routing
   shared_ptr<Interest> interest1p = makeInterest("ndn:/0Jm1ajrW/%00");
   Interest& interest1 = *interest1p;
   interest1.setInterestLifetime(time::milliseconds(8000));
   shared_ptr<pit::Entry> pitEntry1 = pit.insert(interest1).first;

   pitEntry1->insertOrUpdateInRecord(face3, interest1);
   strategy->afterReceiveInterest(*face3, interest1, fibEntry, pitEntry1);

   // forwards to face1 because routing says it's best
   // (no io run here: afterReceiveInterest has already sent the Interest)
   BOOST_REQUIRE_EQUAL(strategy->m_sendInterestHistory.size(), 1);
   BOOST_CHECK_EQUAL(strategy->m_sendInterestHistory[0].get<1>(), face1);

   // forwards to face2 because face1 doesn't respond
   limitedIo.run(1, time::milliseconds(500), time::milliseconds(10));
   BOOST_REQUIRE_EQUAL(strategy->m_sendInterestHistory.size(), 2);
   BOOST_CHECK_EQUAL(strategy->m_sendInterestHistory[1].get<1>(), face2);

   // face2 responds
   shared_ptr<Data> data1p = makeData("ndn:/0Jm1ajrW/%00");
   Data& data1 = *data1p;
   strategy->beforeSatisfyInterest(pitEntry1, *face2, data1);
   this->advanceClocks(time::milliseconds(10), time::milliseconds(500));

   // second Interest: strategy knows face2 is best
   shared_ptr<Interest> interest2p = makeInterest("ndn:/0Jm1ajrW/%00%01");
   Interest& interest2 = *interest2p;
   interest2.setInterestLifetime(time::milliseconds(8000));
   shared_ptr<pit::Entry> pitEntry2 = pit.insert(interest2).first;

   pitEntry2->insertOrUpdateInRecord(face3, interest2);
   strategy->afterReceiveInterest(*face3, interest2, fibEntry, pitEntry2);

   // forwards to face2 because it responds previously
   this->advanceClocks(time::milliseconds(1));
   BOOST_REQUIRE_GE(strategy->m_sendInterestHistory.size(), 3);
   BOOST_CHECK_EQUAL(strategy->m_sendInterestHistory[2].get<1>(), face2);
 }

 BOOST_AUTO_TEST_CASE(Bug1853)
 {
   Forwarder forwarder;
   typedef StrategyTester<fw::NccStrategy> NccStrategyTester;
   shared_ptr<NccStrategyTester> strategy = make_shared<NccStrategyTester>(ref(forwarder));

   shared_ptr<DummyFace> face1 = make_shared<DummyFace>();
   shared_ptr<DummyFace> face2 = make_shared<DummyFace>();
   shared_ptr<DummyFace> face3 = make_shared<DummyFace>();
   forwarder.addFace(face1);
   forwarder.addFace(face2);
   forwarder.addFace(face3);

   Fib& fib = forwarder.getFib();
   shared_ptr<fib::Entry> fibEntry = fib.insert(Name()).first;
   fibEntry->addNextHop(face1, 10);

   StrategyChoice& strategyChoice = forwarder.getStrategyChoice();
   strategyChoice.install(strategy);
   strategyChoice.insert(Name(), strategy->getName());

   Pit& pit = forwarder.getPit();

   // first Interest: strategy follows routing and forwards to face1
   shared_ptr<Interest> interest1 = makeInterest("ndn:/nztwIvHX/%00");
   interest1->setInterestLifetime(time::milliseconds(8000));
   shared_ptr<pit::Entry> pitEntry1 = pit.insert(*interest1).first;

   pitEntry1->insertOrUpdateInRecord(face3, *interest1);
   strategy->afterReceiveInterest(*face3, *interest1, fibEntry, pitEntry1);

   this->advanceClocks(time::milliseconds(1));
   BOOST_REQUIRE_EQUAL(strategy->m_sendInterestHistory.size(), 1);
   BOOST_CHECK_EQUAL(strategy->m_sendInterestHistory[0].get<1>(), face1);

   // face1 responds
   shared_ptr<Data> data1 = makeData("ndn:/nztwIvHX/%00");
   strategy->beforeSatisfyInterest(pitEntry1, *face1, *data1);
   this->advanceClocks(time::milliseconds(10), time::milliseconds(500));

   // second Interest: bestFace is face1, nUpstreams becomes 0,
   // therefore pitEntryInfo->maxInterval cannot be calculated from deferRange and nUpstreams
   shared_ptr<Interest> interest2 = makeInterest("ndn:/nztwIvHX/%01");
   interest2->setInterestLifetime(time::milliseconds(8000));
   shared_ptr<pit::Entry> pitEntry2 = pit.insert(*interest2).first;

   pitEntry2->insertOrUpdateInRecord(face3, *interest2);
   strategy->afterReceiveInterest(*face3, *interest2, fibEntry, pitEntry2);

   // FIB entry is changed before doPropagate executes
   fibEntry->addNextHop(face2, 20);
   this->advanceClocks(time::milliseconds(10), time::milliseconds(1000));// should not crash
 }

 BOOST_AUTO_TEST_CASE(Bug1961)
 {
   LimitedIo limitedIo(this);
   Forwarder forwarder;
   typedef StrategyTester<fw::NccStrategy> NccStrategyTester;
   shared_ptr<NccStrategyTester> strategy = make_shared<NccStrategyTester>(ref(forwarder));
   strategy->onAction.connect(bind(&LimitedIo::afterOp, &limitedIo));

   shared_ptr<DummyFace> face1 = make_shared<DummyFace>();
   shared_ptr<DummyFace> face2 = make_shared<DummyFace>();
   shared_ptr<DummyFace> face3 = make_shared<DummyFace>();
   forwarder.addFace(face1);
   forwarder.addFace(face2);
   forwarder.addFace(face3);

   Fib& fib = forwarder.getFib();
   shared_ptr<fib::Entry> fibEntry = fib.insert(Name()).first;
   fibEntry->addNextHop(face1, 10);
   fibEntry->addNextHop(face2, 20);

   StrategyChoice& strategyChoice = forwarder.getStrategyChoice();
   strategyChoice.install(strategy);
   strategyChoice.insert(Name(), strategy->getName());

   Pit& pit = forwarder.getPit();

   // first Interest: strategy forwards to face1 and face2
   shared_ptr<Interest> interest1 = makeInterest("ndn:/seRMz5a6/%00");
   interest1->setInterestLifetime(time::milliseconds(2000));
   shared_ptr<pit::Entry> pitEntry1 = pit.insert(*interest1).first;

   pitEntry1->insertOrUpdateInRecord(face3, *interest1);
   strategy->afterReceiveInterest(*face3, *interest1, fibEntry, pitEntry1);
   limitedIo.run(2 - strategy->m_sendInterestHistory.size(),
                 time::milliseconds(2000), time::milliseconds(10));
   BOOST_REQUIRE_EQUAL(strategy->m_sendInterestHistory.size(), 2);
   BOOST_CHECK_EQUAL(strategy->m_sendInterestHistory[0].get<1>(), face1);
   BOOST_CHECK_EQUAL(strategy->m_sendInterestHistory[1].get<1>(), face2);

   // face1 responds
   shared_ptr<Data> data1 = makeData("ndn:/seRMz5a6/%00");
   strategy->beforeSatisfyInterest(pitEntry1, *face1, *data1);
   pitEntry1->deleteInRecords();
   this->advanceClocks(time::milliseconds(10));
   // face2 also responds
   strategy->beforeSatisfyInterest(pitEntry1, *face2, *data1);
   this->advanceClocks(time::milliseconds(10));

   // second Interest: bestFace should be face 1
   shared_ptr<Interest> interest2 = makeInterest("ndn:/seRMz5a6/%01");
   interest2->setInterestLifetime(time::milliseconds(2000));
   shared_ptr<pit::Entry> pitEntry2 = pit.insert(*interest2).first;

   pitEntry2->insertOrUpdateInRecord(face3, *interest2);
   strategy->afterReceiveInterest(*face3, *interest2, fibEntry, pitEntry2);
   limitedIo.run(3 - strategy->m_sendInterestHistory.size(),
                 time::milliseconds(2000), time::milliseconds(10));

   BOOST_REQUIRE_GE(strategy->m_sendInterestHistory.size(), 3);
   BOOST_CHECK_EQUAL(strategy->m_sendInterestHistory[2].get<1>(), face1);
 }

 BOOST_AUTO_TEST_CASE(Bug1971)
 {
   LimitedIo limitedIo(this);
   Forwarder forwarder;
   typedef StrategyTester<fw::NccStrategy> NccStrategyTester;
   shared_ptr<NccStrategyTester> strategy = make_shared<NccStrategyTester>(ref(forwarder));
   strategy->onAction.connect(bind(&LimitedIo::afterOp, &limitedIo));

   shared_ptr<DummyFace> face1 = make_shared<DummyFace>();
   shared_ptr<DummyFace> face2 = make_shared<DummyFace>();
   forwarder.addFace(face1);
   forwarder.addFace(face2);

   Fib& fib = forwarder.getFib();
   shared_ptr<fib::Entry> fibEntry = fib.insert(Name()).first;
   fibEntry->addNextHop(face2, 10);

   StrategyChoice& strategyChoice = forwarder.getStrategyChoice();
   strategyChoice.install(strategy);
   strategyChoice.insert(Name(), strategy->getName());

   Pit& pit = forwarder.getPit();

   // first Interest: strategy forwards to face2
   shared_ptr<Interest> interest1 = makeInterest("ndn:/M4mBXCsd");
   interest1->setInterestLifetime(time::milliseconds(2000));
   shared_ptr<pit::Entry> pitEntry1 = pit.insert(*interest1).first;

   pitEntry1->insertOrUpdateInRecord(face1, *interest1);
   strategy->afterReceiveInterest(*face1, *interest1, fibEntry, pitEntry1);
   limitedIo.run(1 - strategy->m_sendInterestHistory.size(),
                 time::milliseconds(2000), time::milliseconds(10));
   BOOST_REQUIRE_EQUAL(strategy->m_sendInterestHistory.size(), 1);
   BOOST_CHECK_EQUAL(strategy->m_sendInterestHistory[0].get<1>(), face2);

   // face2 responds
   shared_ptr<Data> data1 = makeData("ndn:/M4mBXCsd");
   data1->setFreshnessPeriod(time::milliseconds(5));
   strategy->beforeSatisfyInterest(pitEntry1, *face2, *data1);
   pitEntry1->deleteOutRecord(*face2);
   pitEntry1->deleteInRecords();
   this->advanceClocks(time::milliseconds(10));

   // similar Interest: strategy should still forward it
   pitEntry1->insertOrUpdateInRecord(face1, *interest1);
   strategy->afterReceiveInterest(*face1, *interest1, fibEntry, pitEntry1);
   limitedIo.run(2 - strategy->m_sendInterestHistory.size(),
                 time::milliseconds(2000), time::milliseconds(10));
   BOOST_REQUIRE_EQUAL(strategy->m_sendInterestHistory.size(), 2);
   BOOST_CHECK_EQUAL(strategy->m_sendInterestHistory[1].get<1>(), face2);
 }

 BOOST_AUTO_TEST_SUITE_END()

 } // namespace tests
 } // namespace nfd
	/* -- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -- */
	/**
	* Copyright (c) 2014, 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 "fw/ncc-strategy.hpp"
	#include "strategy-tester.hpp"
	#include "tests/daemon/face/dummy-face.hpp"
	#include "tests/limited-io.hpp"

	#include "tests/test-common.hpp"

	namespace nfd {
	namespace tests {

	BOOST_FIXTURE_TEST_SUITE(FwNccStrategy, UnitTestTimeFixture)

	// NccStrategy is fairly complex.
	// The most important property is:
	// it remembers which upstream is the fastest to return Data,
	// and favors this upstream in subsequent Interests.
	BOOST_AUTO_TEST_CASE(FavorRespondingUpstream)
	{
	LimitedIo limitedIo(this);
	Forwarder forwarder;
	typedef StrategyTester<fw::NccStrategy> NccStrategyTester;
	shared_ptr<NccStrategyTester> strategy = make_shared<NccStrategyTester>(ref(forwarder));
	strategy->onAction.connect(bind(&LimitedIo::afterOp, &limitedIo));

	shared_ptr<DummyFace> face1 = make_shared<DummyFace>();
	shared_ptr<DummyFace> face2 = make_shared<DummyFace>();
	shared_ptr<DummyFace> face3 = make_shared<DummyFace>();
	forwarder.addFace(face1);
	forwarder.addFace(face2);
	forwarder.addFace(face3);

	Fib& fib = forwarder.getFib();
	shared_ptr<fib::Entry> fibEntry = fib.insert(Name()).first;
	fibEntry->addNextHop(face1, 10);
	fibEntry->addNextHop(face2, 20);

	StrategyChoice& strategyChoice = forwarder.getStrategyChoice();
	strategyChoice.install(strategy);
	strategyChoice.insert(Name(), strategy->getName());

	Pit& pit = forwarder.getPit();

	// first Interest: strategy knows nothing and follows routing
	shared_ptr<Interest> interest1p = makeInterest("ndn:/0Jm1ajrW/%00");
	Interest& interest1 = *interest1p;
	interest1.setInterestLifetime(time::milliseconds(8000));
	shared_ptr<pit::Entry> pitEntry1 = pit.insert(interest1).first;

	pitEntry1->insertOrUpdateInRecord(face3, interest1);
	strategy->afterReceiveInterest(*face3, interest1, fibEntry, pitEntry1);

	// forwards to face1 because routing says it's best
	// (no io run here: afterReceiveInterest has already sent the Interest)
	BOOST_REQUIRE_EQUAL(strategy->m_sendInterestHistory.size(), 1);
	BOOST_CHECK_EQUAL(strategy->m_sendInterestHistory[0].get<1>(), face1);

	// forwards to face2 because face1 doesn't respond
	limitedIo.run(1, time::milliseconds(500), time::milliseconds(10));
	BOOST_REQUIRE_EQUAL(strategy->m_sendInterestHistory.size(), 2);
	BOOST_CHECK_EQUAL(strategy->m_sendInterestHistory[1].get<1>(), face2);

	// face2 responds
	shared_ptr<Data> data1p = makeData("ndn:/0Jm1ajrW/%00");
	Data& data1 = *data1p;
	strategy->beforeSatisfyInterest(pitEntry1, *face2, data1);
	this->advanceClocks(time::milliseconds(10), time::milliseconds(500));

	// second Interest: strategy knows face2 is best
	shared_ptr<Interest> interest2p = makeInterest("ndn:/0Jm1ajrW/%00%01");
	Interest& interest2 = *interest2p;
	interest2.setInterestLifetime(time::milliseconds(8000));
	shared_ptr<pit::Entry> pitEntry2 = pit.insert(interest2).first;

	pitEntry2->insertOrUpdateInRecord(face3, interest2);
	strategy->afterReceiveInterest(*face3, interest2, fibEntry, pitEntry2);

	// forwards to face2 because it responds previously
	this->advanceClocks(time::milliseconds(1));
	BOOST_REQUIRE_GE(strategy->m_sendInterestHistory.size(), 3);
	BOOST_CHECK_EQUAL(strategy->m_sendInterestHistory[2].get<1>(), face2);
	}

	BOOST_AUTO_TEST_CASE(Bug1853)
	{
	Forwarder forwarder;
	typedef StrategyTester<fw::NccStrategy> NccStrategyTester;
	shared_ptr<NccStrategyTester> strategy = make_shared<NccStrategyTester>(ref(forwarder));

	shared_ptr<DummyFace> face1 = make_shared<DummyFace>();
	shared_ptr<DummyFace> face2 = make_shared<DummyFace>();
	shared_ptr<DummyFace> face3 = make_shared<DummyFace>();
	forwarder.addFace(face1);
	forwarder.addFace(face2);
	forwarder.addFace(face3);

	Fib& fib = forwarder.getFib();
	shared_ptr<fib::Entry> fibEntry = fib.insert(Name()).first;
	fibEntry->addNextHop(face1, 10);

	StrategyChoice& strategyChoice = forwarder.getStrategyChoice();
	strategyChoice.install(strategy);
	strategyChoice.insert(Name(), strategy->getName());

	Pit& pit = forwarder.getPit();

	// first Interest: strategy follows routing and forwards to face1
	shared_ptr<Interest> interest1 = makeInterest("ndn:/nztwIvHX/%00");
	interest1->setInterestLifetime(time::milliseconds(8000));
	shared_ptr<pit::Entry> pitEntry1 = pit.insert(*interest1).first;

	pitEntry1->insertOrUpdateInRecord(face3, *interest1);
	strategy->afterReceiveInterest(face3, interest1, fibEntry, pitEntry1);

	this->advanceClocks(time::milliseconds(1));
	BOOST_REQUIRE_EQUAL(strategy->m_sendInterestHistory.size(), 1);
	BOOST_CHECK_EQUAL(strategy->m_sendInterestHistory[0].get<1>(), face1);

	// face1 responds
	shared_ptr<Data> data1 = makeData("ndn:/nztwIvHX/%00");
	strategy->beforeSatisfyInterest(pitEntry1, face1, data1);
	this->advanceClocks(time::milliseconds(10), time::milliseconds(500));

	// second Interest: bestFace is face1, nUpstreams becomes 0,
	// therefore pitEntryInfo->maxInterval cannot be calculated from deferRange and nUpstreams
	shared_ptr<Interest> interest2 = makeInterest("ndn:/nztwIvHX/%01");
	interest2->setInterestLifetime(time::milliseconds(8000));
	shared_ptr<pit::Entry> pitEntry2 = pit.insert(*interest2).first;

	pitEntry2->insertOrUpdateInRecord(face3, *interest2);
	strategy->afterReceiveInterest(face3, interest2, fibEntry, pitEntry2);

	// FIB entry is changed before doPropagate executes
	fibEntry->addNextHop(face2, 20);
	this->advanceClocks(time::milliseconds(10), time::milliseconds(1000));// should not crash
	}

	BOOST_AUTO_TEST_CASE(Bug1961)
	{
	LimitedIo limitedIo(this);
	Forwarder forwarder;
	typedef StrategyTester<fw::NccStrategy> NccStrategyTester;
	shared_ptr<NccStrategyTester> strategy = make_shared<NccStrategyTester>(ref(forwarder));
	strategy->onAction.connect(bind(&LimitedIo::afterOp, &limitedIo));

	shared_ptr<DummyFace> face1 = make_shared<DummyFace>();
	shared_ptr<DummyFace> face2 = make_shared<DummyFace>();
	shared_ptr<DummyFace> face3 = make_shared<DummyFace>();
	forwarder.addFace(face1);
	forwarder.addFace(face2);
	forwarder.addFace(face3);

	Fib& fib = forwarder.getFib();
	shared_ptr<fib::Entry> fibEntry = fib.insert(Name()).first;
	fibEntry->addNextHop(face1, 10);
	fibEntry->addNextHop(face2, 20);

	StrategyChoice& strategyChoice = forwarder.getStrategyChoice();
	strategyChoice.install(strategy);
	strategyChoice.insert(Name(), strategy->getName());

	Pit& pit = forwarder.getPit();

	// first Interest: strategy forwards to face1 and face2
	shared_ptr<Interest> interest1 = makeInterest("ndn:/seRMz5a6/%00");
	interest1->setInterestLifetime(time::milliseconds(2000));
	shared_ptr<pit::Entry> pitEntry1 = pit.insert(*interest1).first;

	pitEntry1->insertOrUpdateInRecord(face3, *interest1);
	strategy->afterReceiveInterest(face3, interest1, fibEntry, pitEntry1);
	limitedIo.run(2 - strategy->m_sendInterestHistory.size(),
	time::milliseconds(2000), time::milliseconds(10));
	BOOST_REQUIRE_EQUAL(strategy->m_sendInterestHistory.size(), 2);
	BOOST_CHECK_EQUAL(strategy->m_sendInterestHistory[0].get<1>(), face1);
	BOOST_CHECK_EQUAL(strategy->m_sendInterestHistory[1].get<1>(), face2);

	// face1 responds
	shared_ptr<Data> data1 = makeData("ndn:/seRMz5a6/%00");
	strategy->beforeSatisfyInterest(pitEntry1, face1, data1);
	pitEntry1->deleteInRecords();
	this->advanceClocks(time::milliseconds(10));
	// face2 also responds
	strategy->beforeSatisfyInterest(pitEntry1, face2, data1);
	this->advanceClocks(time::milliseconds(10));

	// second Interest: bestFace should be face 1
	shared_ptr<Interest> interest2 = makeInterest("ndn:/seRMz5a6/%01");
	interest2->setInterestLifetime(time::milliseconds(2000));
	shared_ptr<pit::Entry> pitEntry2 = pit.insert(*interest2).first;

	pitEntry2->insertOrUpdateInRecord(face3, *interest2);
	strategy->afterReceiveInterest(face3, interest2, fibEntry, pitEntry2);
	limitedIo.run(3 - strategy->m_sendInterestHistory.size(),
	time::milliseconds(2000), time::milliseconds(10));

	BOOST_REQUIRE_GE(strategy->m_sendInterestHistory.size(), 3);
	BOOST_CHECK_EQUAL(strategy->m_sendInterestHistory[2].get<1>(), face1);
	}

	BOOST_AUTO_TEST_CASE(Bug1971)
	{
	LimitedIo limitedIo(this);
	Forwarder forwarder;
	typedef StrategyTester<fw::NccStrategy> NccStrategyTester;
	shared_ptr<NccStrategyTester> strategy = make_shared<NccStrategyTester>(ref(forwarder));
	strategy->onAction.connect(bind(&LimitedIo::afterOp, &limitedIo));

	shared_ptr<DummyFace> face1 = make_shared<DummyFace>();
	shared_ptr<DummyFace> face2 = make_shared<DummyFace>();
	forwarder.addFace(face1);
	forwarder.addFace(face2);

	Fib& fib = forwarder.getFib();
	shared_ptr<fib::Entry> fibEntry = fib.insert(Name()).first;
	fibEntry->addNextHop(face2, 10);

	StrategyChoice& strategyChoice = forwarder.getStrategyChoice();
	strategyChoice.install(strategy);
	strategyChoice.insert(Name(), strategy->getName());

	Pit& pit = forwarder.getPit();

	// first Interest: strategy forwards to face2
	shared_ptr<Interest> interest1 = makeInterest("ndn:/M4mBXCsd");
	interest1->setInterestLifetime(time::milliseconds(2000));
	shared_ptr<pit::Entry> pitEntry1 = pit.insert(*interest1).first;

	pitEntry1->insertOrUpdateInRecord(face1, *interest1);
	strategy->afterReceiveInterest(face1, interest1, fibEntry, pitEntry1);
	limitedIo.run(1 - strategy->m_sendInterestHistory.size(),
	time::milliseconds(2000), time::milliseconds(10));
	BOOST_REQUIRE_EQUAL(strategy->m_sendInterestHistory.size(), 1);
	BOOST_CHECK_EQUAL(strategy->m_sendInterestHistory[0].get<1>(), face2);

	// face2 responds
	shared_ptr<Data> data1 = makeData("ndn:/M4mBXCsd");
	data1->setFreshnessPeriod(time::milliseconds(5));
	strategy->beforeSatisfyInterest(pitEntry1, face2, data1);
	pitEntry1->deleteOutRecord(*face2);
	pitEntry1->deleteInRecords();
	this->advanceClocks(time::milliseconds(10));

	// similar Interest: strategy should still forward it
	pitEntry1->insertOrUpdateInRecord(face1, *interest1);
	strategy->afterReceiveInterest(face1, interest1, fibEntry, pitEntry1);
	limitedIo.run(2 - strategy->m_sendInterestHistory.size(),
	time::milliseconds(2000), time::milliseconds(10));
	BOOST_REQUIRE_EQUAL(strategy->m_sendInterestHistory.size(), 2);
	BOOST_CHECK_EQUAL(strategy->m_sendInterestHistory[1].get<1>(), face2);
	}

	BOOST_AUTO_TEST_SUITE_END()

	} // namespace tests
	} // namespace nfd