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# when sprouting a branch all revisions named in the tags are copied
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builder = self.make_branch_builder('source')
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source.tags.set_tag('tag-a', 'rev-2')
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except errors.TagsNotSupported:
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raise TestNotApplicable('Branch format does not support tags.')
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# Now source has a tag not in its ancestry. Sprout its controldir.
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target = dir.sprout(self.get_url('target'))