ioloop_test: Explicitly close an IOLoop

This avoids a warning logged at GC time.

diff --git a/tornado/test/ioloop_test.py b/tornado/test/ioloop_test.py
index 903383abda68f64e8a6ab230b15a2ed8ed2705a3..adabeafe5fc41b07627031021f6d4cee23cb9612 100644 (file)
--- a/tornado/test/ioloop_test.py
+++ b/tornado/test/ioloop_test.py
@@ -775,6 +775,7 @@ class TestPeriodicCallback(unittest.TestCase):
         io_loop.call_later(50, io_loop.stop)
         io_loop.start()
         self.assertEqual(calls, [1010, 1020, 1030, 1040, 1050])
+        io_loop.close()
 
 
 class TestIOLoopConfiguration(unittest.TestCase):