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# Merging a branch pulls its revision into the tree
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b = branch.Branch.open('../b')
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b_tip = b.last_revision()
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self.assertEqual([a_tip, b_tip], a.get_parent_ids())
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a_tree.revert(backups=False)
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out, err = self.run_bzr('merge -r revno:1:./hello', retcode=3)