add policy checker

Change-Id: I90c50d15b1d9d97832c66ce90e39524729f12a0f
diff --git a/tests/core/unit-test-time-fixture.hpp b/tests/core/unit-test-time-fixture.hpp
new file mode 100644
index 0000000..e70d66e
--- /dev/null
+++ b/tests/core/unit-test-time-fixture.hpp
@@ -0,0 +1,69 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/**
+ * Copyright (c) 2014,  Regents of the University of California
+ *
+ * This file is part of NSL (NDN Signature Logger).
+ * See AUTHORS.md for complete list of NSL authors and contributors.
+ *
+ * NSL 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.
+ *
+ * NSL 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
+ * NSL, e.g., in COPYING.md file.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * See AUTHORS.md for complete list of nsl authors and contributors.
+ */
+
+#ifndef NSL_TESTS_UNIT_TESTS_UNIT_TEST_TIME_FIXTURE_HPP
+#define NSL_TESTS_UNIT_TESTS_UNIT_TEST_TIME_FIXTURE_HPP
+
+#include <ndn-cxx/util/time-unit-test-clock.hpp>
+
+#include <boost/asio.hpp>
+
+namespace nsl {
+namespace tests {
+
+class UnitTestTimeFixture
+{
+public:
+  UnitTestTimeFixture()
+    : steadyClock(make_shared<ndn::time::UnitTestSteadyClock>())
+    , systemClock(make_shared<ndn::time::UnitTestSystemClock>())
+  {
+    time::setCustomClocks(steadyClock, systemClock);
+  }
+
+  ~UnitTestTimeFixture()
+  {
+    time::setCustomClocks(nullptr, nullptr);
+  }
+
+  void
+  advanceClocks(const time::nanoseconds& tick, size_t nTicks = 1)
+  {
+    for (size_t i = 0; i < nTicks; ++i) {
+      steadyClock->advance(tick);
+      systemClock->advance(tick);
+
+      if (io.stopped())
+        io.reset();
+      io.poll();
+    }
+  }
+
+public:
+  shared_ptr<ndn::time::UnitTestSteadyClock> steadyClock;
+  shared_ptr<ndn::time::UnitTestSystemClock> systemClock;
+  boost::asio::io_service io;
+};
+
+} // namespace tests
+} // namespace nsl
+
+#endif // NSL_TESTS_UNIT_TESTS_UNIT_TEST_TIME_FIXTURE_HPP