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

[Daniel Watkins]

Attached are fixes for tests.blackbox.test_added,
tests.blackbox.test_aliases and tests.blackbox.test_ancestry.

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