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

[Daniel Watkins]

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Attached is a fix for tests.blackbox.test_find_merge_base (the only 'f'
in need of attention).

I was hoping to introduce these merges at a slower rate, so as not to
choke the queue too much, but I'm about to go away for the best part of
two weeks where time and Internet access are likely to be in equally
short supply so I'm submitting the ones I had waiting locally now.

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