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

[Robert Collins]

On Wed, 2008-02-27 at 21:13 -0500, Aaron Bentley wrote:
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> Robert Collins wrote:
> > This fixes a couple of incorrectly written tests, by trivially letting
> > bzr assign an appropriate root ID and querying for it.
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> Could you explain a little more about why the tests were incorrect?

They assumed that '' was a valid file id for '/'.

-Rob
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