ping: Tests for Ping and PingServer

This commit includes minor refactoring in Ping and PingServer to support unit testing

refs #2796

Change-Id: Id0172486aa07e129a90091d72594fbccbb5dbc06
diff --git a/tests/ping/client/ping.t.cpp b/tests/ping/client/ping.t.cpp
new file mode 100644
index 0000000..9f9eeb9
--- /dev/null
+++ b/tests/ping/client/ping.t.cpp
@@ -0,0 +1,121 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/**
+ * Copyright (c) 2014-2015,  Arizona Board of Regents.
+ *
+ * This file is part of ndn-tools (Named Data Networking Essential Tools).
+ * See AUTHORS.md for complete list of ndn-tools authors and contributors.
+ *
+ * ndn-tools 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.
+ *
+ * ndn-tools 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
+ * ndn-tools, e.g., in COPYING.md file.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "tools/ping/client/ping.hpp"
+#include <ndn-cxx/util/dummy-client-face.hpp>
+
+#include "tests/test-common.hpp"
+
+namespace ndn {
+namespace ping {
+namespace client {
+namespace tests {
+
+using namespace ndn::tests;
+
+BOOST_AUTO_TEST_SUITE(PingClientPing)
+
+class SequenceNumberIncrementFixture : public UnitTestTimeFixture
+{
+protected:
+  SequenceNumberIncrementFixture()
+    : face(util::makeDummyClientFace(io, {false, true}))
+    , pingOptions(makeOptions())
+    , ping(*face, pingOptions)
+    , numPings(0)
+    , lastPingSeq(pingOptions.startSeq)
+  {
+    ping.afterResponse.connect(bind(&SequenceNumberIncrementFixture::onResponse, this, _1));
+    ping.afterTimeout.connect(bind(&SequenceNumberIncrementFixture::onTimeout, this, _1));
+  }
+
+public:
+  void
+  onResponse(uint64_t seq)
+  {
+    numPings++;
+    lastPingSeq = seq;
+    if (numPings == maxPings) {
+      face->shutdown();
+      io.stop();
+    }
+  }
+
+  void
+  onTimeout(uint64_t seq)
+  {
+    numPings++;
+    lastPingSeq = seq;
+    if (numPings == maxPings) {
+      face->shutdown();
+      io.stop();
+    }
+  }
+
+private:
+  static Options
+  makeOptions()
+  {
+    Options opt;
+    opt.prefix = "ndn:/test-prefix";
+    opt.shouldAllowStaleData = false;
+    opt.shouldGenerateRandomSeq = false;
+    opt.shouldPrintTimestamp = false;
+    opt.nPings = 4;
+    opt.interval = time::milliseconds(100);
+    opt.timeout = time::milliseconds(1000);
+    opt.startSeq = 1000;
+    return opt;
+  }
+
+protected:
+  boost::asio::io_service io;
+  shared_ptr<util::DummyClientFace> face;
+  Options pingOptions;
+  Ping ping;
+  uint32_t numPings;
+  uint32_t maxPings;
+  uint64_t lastPingSeq;
+  KeyChain keyChain;
+};
+
+BOOST_FIXTURE_TEST_CASE(SequenceNumberIncrement, SequenceNumberIncrementFixture)
+{
+  maxPings = 4;
+  ping.start();
+
+  this->advanceClocks(io, time::milliseconds(1), 400);
+
+  face->receive(*makeData("ndn:/test-prefix/ping/1000"));
+  face->receive(*makeData("ndn:/test-prefix/ping/1001"));
+  face->receive(*makeData("ndn:/test-prefix/ping/1002"));
+  face->receive(*makeData("ndn:/test-prefix/ping/1003"));
+
+  io.run();
+
+  BOOST_REQUIRE_EQUAL(1003, lastPingSeq);
+  BOOST_REQUIRE_EQUAL(4, numPings);
+}
+
+BOOST_AUTO_TEST_SUITE_END()
+
+} // namespace tests
+} // namespace client
+} // namespace ping
+} // namespace ndn