[MERGE] Additional fetch testcase

[John Arbash Meinel]

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Aaron Bentley wrote:
> This testcase ensures that the tree root's knit is updated properly.  I
> wrote it to make sure nothing was wrong with
> WorkingTree.fileids_altered_by_revision_ids, and nothing is.  But I
> figure extra testing is always good.
> 
> Aaron



v- The only thing I would add is "Ensure that knit2.fetch()' updates the
root knit"

Or something that indicates it is 'fetch' when using knit2 format.
+    def test_fetch_root_knit(self):
+        """Ensure that knit2 updates the root knit
+
+        This tests the case where the root has been changed
+        """

Otherwise, I think adding a test case like this is fine for 0.12. It
isn't going to disrupt anything or introduce regressions.

John
=:->
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