diff --git a/test/test-event-scheduler.cc b/test/test-event-scheduler.cc
index 0eacba0..4db9a0e 100644
--- a/test/test-event-scheduler.cc
+++ b/test/test-event-scheduler.cc
@@ -96,6 +96,16 @@
   BOOST_CHECK_EQUAL(scheduler->size(), 1);
   usleep(1000000);
 
+  BOOST_CHECK_EQUAL(scheduler->size(), 0);
+  scheduler->addTask(task1);
+  usleep(400000);
+  BOOST_CHECK_EQUAL(scheduler->size(), 1);
+  scheduler->rescheduleTask(task1);
+  usleep(400000);
+  BOOST_CHECK_EQUAL(scheduler->size(), 1);
+  usleep(110000);
+  BOOST_CHECK_EQUAL(scheduler->size(), 0);
+
 
   int hello = 0, world = 0, period = 0;
 
@@ -116,8 +126,8 @@
     period = it->second;
   }
 
-  // added four times, canceled once before invoking callback
-  BOOST_CHECK_EQUAL(hello, 3);
+  // added five times, canceled once before invoking callback
+  BOOST_CHECK_EQUAL(hello, 4);
   // added two times, canceled once by matcher before invoking callback
   BOOST_CHECK_EQUAL(world, 1);
   // invoked every 0.2 seconds before deleted by matcher