There used to be https://phab-01.wmflabs.org/. That seems to be gone, but there is https://phab.wmflabs.org/. Is that the testing environment?
Topic on Talk:Phabricator/Help
That's what the Phabricator page currently states (but how does it matter?). :)
Great, and obvious. Thanks! I'll inform those who asked me. :)
On an unrelated note, those who asked you are more than welcome to ask their question here themselves on this wiki. :)
I agree, and have said as much. Thank you. :)