core: Basic implementation of Scheduler

refs #1119 (http://redmine.named-data.net/issues/1119)

Change-Id: I1783857452941794a2538534d3492d30ac58dd25
diff --git a/tests/core/time.cpp b/tests/core/time.cpp
index caae6d0..64ad830 100644
--- a/tests/core/time.cpp
+++ b/tests/core/time.cpp
@@ -19,6 +19,29 @@
   BOOST_CHECK_LE(p1, p2);
 }
 
+BOOST_AUTO_TEST_CASE(Operations)
+{
+  // helpers
+  BOOST_CHECK_GT(time::seconds(1), time::milliseconds(1));
+  BOOST_CHECK_GT(time::milliseconds(1), time::microseconds(1));
+  BOOST_CHECK_GT(time::microseconds(1), time::nanoseconds(1));
+  
+  // duration operations + helpers
+  BOOST_CHECK_EQUAL(time::seconds(8) + time::microseconds(101), time::nanoseconds(8000101000));
+  BOOST_CHECK_EQUAL(time::seconds(7) - time::milliseconds(234), time::microseconds(6766000));
+
+  // point operations
+  time::Point p1 = time::now();
+  time::Point p2 = p1 + time::milliseconds(10000);
+  time::Point p3 = p2 - time::microseconds(5000000);
+  BOOST_CHECK_LE(p1, p2);
+  BOOST_CHECK_LE(p1, p3);
+  BOOST_CHECK_LE(p3, p2);
+  
+  BOOST_CHECK_EQUAL(p2 - p1, time::seconds(10));
+  BOOST_CHECK_EQUAL(p3 - p1, time::seconds(5));
+}
+
 BOOST_AUTO_TEST_SUITE_END()
 
 } // namespace ndn