fest-assert-2.x
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#50 "contains only once"
I added "contains only once" functionality.
I'm sorry, but I'm reverting this change. I don't think this is general enough to be part of FEST. We hope to make FEST easy to extend so users can add their own assertions painlessly.
I think this assertion is valuable because I don't see any other obvious/direct way to do it and because it comes from a Fest user that needed it for its project and contributed it (as part of a hackergarten btw).
My 2cts