#4736 BufferRWPair.closed shouldn't try to call another property as a function
diff --git a/Lib/test/test_io.py b/Lib/test/test_io.py
index 8a7da60..967018e 100644
--- a/Lib/test/test_io.py
+++ b/Lib/test/test_io.py
@@ -554,8 +554,9 @@
         r = MockRawIO(())
         w = MockRawIO()
         pair = io.BufferedRWPair(r, w)
+        self.assertFalse(pair.closed)
 
-        # XXX need implementation
+        # XXX More Tests
 
 
 class BufferedRandomTest(unittest.TestCase):