[MERGE] Convert tests.blackbox.test_[pull|nick] to use internals where appropriate

[Daniel Watkins]

On Tue, 2007-08-21 at 10:41 -0400, Aaron Bentley wrote:
> WorkingTree.open('.')
This isn't working.  I believe the intent of the statement is to recurse
upward until the WorkingTree is found, which WorkingTree.open_containing
does but WorkingTree.open doesn't (IIUC).
-- 
Daniel Watkins (Odd_Bloke) <D.M.Watkins at warwick.ac.uk>
University of Warwick Christian Focus President
University of Warwick Computing Society WUGLUG Liaison Officer
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