[MERGE] Convert tests.blackbox.test_add to use internals where appropriate

[Daniel Watkins]

John Arbash Meinel wrote:
> you know, you can send bigger requests than this :)
I will do.  I'm going through file-by-file in alphabetical order.
test_add just happened to be a 4 line diff. :p

-- 
Daniel Watkins (Odd_Bloke)
University of Warwick Christian Focus President
University of Warwick Computing Society WUGLUG Liaison Officer

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