Stack Exchange network consists of 182 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.
Q&A for work
Connect and share knowledge within a single location that is structured and easy to search.
In the review queues I have never once been tested with a question that has been flagged as duplicate. Does SE not test you on those? And if so, why not? Or have I just not had any?