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br_a3.fetch(br_a2, br_a.revision_history()[2])
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# pull the 3 revisions introduced by a@u-0-3
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br_a3.fetch(br_a2, br_a.revision_history()[3])
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self.assertRaises(errors.InstallFailed, br_a3.fetch, br_a2, 'pizza')
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self.assertRaises(errors.NoSuchRevision, br_a3.fetch, br_a2, 'pizza')
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# TODO: Test trying to fetch from a branch that points to a revision not
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# actually present in its repository. Not every branch format allows you