anchor.diff:  +
   ----
   $ kn service describe hello
  +Name:       hello
  +Namespace:  default
  +Age:        13m
  +URL:        http://hello.default.apps-crc.testing
  +Address:    http://hello.default.svc.cluster.local
   
  -Name:         hello
  -Namespace:    default
  -URL:          http://hello.default.apps-crc.testing
  -Address:      http://hello.default.svc.cluster.local
  -Annotations:  serving.knative.dev/creator=kube:admin, serving.knative.dev/lastModifier=kube:admin
  -Age:          34m
  +Revisions:  
  +  100%  @latest (hello-dghll-2) [2] (1m)
  +        Image:  gcr.io/knative-samples/helloworld-go (pinned to 5ea96b)
   
  -Revisions:
  -  100%  Name:    hello-fszsh-2 [2] (35s)
  -        Image:   gcr.io/knative-samples/helloworld-go (pinned to 5ea96ba4b872)
  -        Env:     TARGET=Kn
  -        Memory:  100M ... 200M
  -        CPU:     400m ... 1
  -
  -Conditions:
  +Conditions:  
     OK TYPE                   AGE REASON
  -  ++ ConfigurationsReady    22s 
  -  ++ Ready                  22s 
  -  ++ RoutesReady            22s ribe hello
  +  ++ Ready                   1m 
  +  ++ ConfigurationsReady     1m 
  +  ++ RoutesReady             1m 
   ----
   
   . Delete the service.
   +
   ----
   $ kn service delete hello
  -
   Service 'hello' successfully deleted in namespace 'default'.
   ----
   +
  
positive.code: +
  ----
  $ kn service list
  
  NAME    URL                                     GENERATION   AGE   CONDITIONS   READY   REASON
  hello   http://hello.default.apps-crc.testing   1            85s   3 OK / 3     True    
  ----
  
  . Check if the service is working by using the `curl` service endpoint command:
  
negative.code: +
  ----
  $ kn service update hello --env TARGET=Kn
  Updating Service 'hello' in namespace 'default':
  
   10.136s Traffic is not yet migrated to the latest revision.
   10.175s Ingress has not yet been reconciled.
   10.348s Ready to serve.
  
  Service 'hello' updated with latest revision 'hello-dghll-2' and URL:
  http://hello.default.apps-crc.testing
  ----
  +
  The service's environment variable `TARGET` is now set to `Kn`.
  