Test notifies are received ok polling an async cur

tests/test_async.py

@@ -497,7 +497,28 @@ class AsyncTests(ConnectingTestCase):
 
     def test_poll_noop(self):
         self.conn.poll()
-        self.conn.poll()
+
+    @skip_before_postgres(9, 0)
+    def test_poll_conn_for_notification(self):
+        with self.conn.cursor() as cur:
+            cur.execute("listen test")
+            self.wait(cur)
+
+        with self.sync_conn.cursor() as cur:
+            cur.execute("notify test, 'hello'")
+            self.sync_conn.commit()
+
+        for i in range(10):
+            self.conn.poll()
+
+            if self.conn.notifies:
+                n = self.conn.notifies.pop()
+                self.assertEqual(n.channel, 'test')
+                self.assertEqual(n.payload, 'hello')
+                break
+            time.sleep(0.1)
+        else:
+            self.fail("No notification received")
 
 
 def test_suite():