add a delay

Author: blink1073

test/asynchronous/test_srv_polling.py

@@ -222,6 +222,7 @@ def response_callback(*args):
                 raise exc("DNS Failure!")
 
             print(exc)
+            await asyncio.sleep(0.1)
 
             await self.run_scenario(response_callback, False)
 

test/test_srv_polling.py

@@ -222,6 +222,7 @@ def response_callback(*args):
                 raise exc("DNS Failure!")
 
             print(exc)
+            time.sleep(0.1)
 
             self.run_scenario(response_callback, False)