In other words, should we now look at the content of the answers when we are evaluating questions for possible duplication? Is it sufficient to say "Your answer can be found in this question over here, therefore your question is a duplicate?"
The new guidance is here:
Among other things, it describes the new close banner:
This question already has an answer here:
Link to the Duplicate Question
... which seems to suggest that, if some other question in the system answers the OP's question, then the OP's question can be closed as a duplicate on that basis (even if the question itself is not necessarily duplicated).
Note the comments below the question, where I dispute the assertion made there that it is a duplicate question. The original question doesn't mention unit testing.