anchor.diff:  +
   ----
   $ kn service update hello --env TARGET=Kn
  +Updating Service 'hello' in namespace 'default':
   
  -Waiting for service 'hello' to become ready ... OK
  -Service 'hello' updated 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`.
  
positive.code: +
  ----
  $ kn service list hello
  
  No services found.
  ----
  
negative.code: +
  ----
  $ kn service create hello --image gcr.io/knative-samples/helloworld-go --env TARGET=Knative
  Creating service 'hello' in namespace 'default':
  
    0.085s The Route is still working to reflect the latest desired specification.
    0.101s Configuration "hello" is waiting for a Revision to become ready.
   11.590s ...
   11.650s Ingress has not yet been reconciled.
   11.726s Ready to serve.
  
  Service 'hello' created with latest revision 'hello-gsdks-1' and URL:
  http://hello.default.apps-crc.testing
  ----
  
  