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The title pretty much says it all. Is the testing tag really necessary here? I think that would be like having a [software-development] tag on StackOverflow.
Is there any benefit to it?
The testing tag has been placed on the blacklist, as well as quality, assurance, and qa.
My vote is no. It seems redundant. But I suppose we can revisit the question if we find a (relevant) question that we don't know how to tag.