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                        Test for websocket ping on the creation of the resource which has been subscribed to
in https://github.com/solid/test-suite/blob/master/testers/websockets-pubsub/tester/test/surface/change-events.test.ts let us have also another test just the same except the subscription is to the resource which is created, not the container.
ie a test with
   wsClient.send('sub http://server:8080/asdf/')
replaced with
   wsClient.send('sub http://server:8080/asdf/test.txt')
see also https://github.com/solid/solid-spec/issues/217