Also add a sleep.
@@ -1199,6 +1199,7 @@ class ActionExecutionOutputControllerTestCase(BaseActionExecutionControllerTestC
# Retrieve lister instance to avoid race with listener connection not
# being established early enough for tests to pass
listener = get_listener(name='execution_output') # NOQA
+ eventlet.sleep(0.5)
# Test the execution output API endpoint for execution which is running (blocking)
status = action_constants.LIVEACTION_STATUS_RUNNING
