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

[Alexander Belchenko]

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Daniel Watkins пишет:
> Attached is a fix for tests.blackbox.test_diff (the only 'd' in need of
> attention).

BTW, should we update year in copyrights every time we tune tests modules,
like this one? As I can see from annotate test_diff.py already touched
during this year, but it still show 2006 year in copyrights.

It's a bit nitpicking, I agree, it's just random thoughts.
Our current copyright checker does not actually check year.
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