I just wanted to review first posts and got this one. A few days ago, I already came across that quesiton by normally browsing AskUbuntu.
I knew that the wording of the question was exactly the same of the one I came across a few days ago so I concluded it's either a verbatim duplicate or a test quesiton.
I googled for the original quesiton in a different tab and found it. Then, I tried to mark the question I was reviewing as a duplicate of that question. It didn't work because the question I pasted the URL was the same as the one I was reviewing. So it wasn't verbatim duplicate but a test.
The website should know that the reviewer knows what's going on when they paste the URL of the original quesiton when attempting to flag it as a duplicate. This is when – in my opinion – there should be a message stating that it's just a test.
I then went on to comment on that question stating that it's a verbatim copy of that other question (which I linked to), just to make sure it isn't a bug emerging when someone makes a verbatim copy of a quesiton – knowing that I could delete my comment if it was a test and my comment was therefore unnecessary because I still had the first question open in a different tab.
When posting that comment, I got this message:
STOP! Look and Listen.
This was an audit, designed to see if you were paying attention. You didn't pass. Your review was inappropriate. This was a high quality post and you should have considered leaving it as-is or even upvoting.
Don't worry, we've already handled this post appropriately – but please take a minute to look it over closely, keeping in mind the guidance above.
Apart from what I think should happen if the reviewer attempts to flag the question as a duplicate of the actual question, I think it's inappropriate to show this message when the reviewer tries to comment. Not only could I just have commented the question in a helpful way, but this particular question also was basically answered by a question on the Unix StackExchange site. I could've linked to that question in a comment as someone else on the actual question actually did. That helpful comment was not visible when reviewing, therefore the link could have been added by a reviewer, even if they didn't know about the original question on the same site but only about the question on the Unix StackExchange site.
So I think this behavior is inappropriate and wrong in at least 2 ways and should be changed.