[MERGE] Fix branch interface tests were invalid for branches using subtree repositories

[Robert Collins]

On Thu, 2008-02-28 at 07:47 -0500, Aaron Bentley wrote:
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> Robert Collins wrote:
> > On Wed, 2008-02-27 at 21:13 -0500, Aaron Bentley wrote:
> >> Robert Collins wrote:
> >>> This fixes a couple of incorrectly written tests, by trivially letting
> >>> bzr assign an appropriate root ID and querying for it.
> >> Could you explain a little more about why the tests were incorrect?
> > 
> > They assumed that '' was a valid file id for '/'.
> 
> What makes it not a valid id on nested trees?

Its not about nested trees, its really about rich roots. Anyhow, I don't
think its permitted anywhere, it was simply not being passed into the
relevant code paths because a tree that doesn't version its root was
being used.

Its easy enough to make this break if you want to experiment: change the
format description for testing branch6 to use a pack-rich-root
repository format.

-Rob

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