fixed call to broadcast in celery.task.control.ping

added test

celery/task/control.py

@@ -60,7 +60,7 @@ def ping(destination=None, timeout=1, **kwargs):
     :keyword limit: Limit number of replies.
 
     """
-    return broadcast("ping", wait=True, destination=destination,
+    return broadcast("ping", reply=True, destination=destination,
                      timeout=timeout, **kwargs)
 
 

celery/tests/test_task_control.py

@@ -48,6 +48,11 @@ class TestBroadcast(unittest.TestCase):
         control.revoke("foozbaaz")
         self.assertIn("revoke", MockBroadcastPublisher.sent)
 
+    @with_mock_broadcast
+    def test_ping(self):
+        control.ping()
+        self.assertIn("ping", MockBroadcastPublisher.sent)
+
     @with_mock_broadcast
     def test_revoke_from_result(self):
         from celery.result import AsyncResult