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self.build_tree(['base/foo'])
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base.commit('base commit')
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# make another one stacked
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# this must really be stacked (or get_stacked_on_url raises an error)
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self.assertTrue(stacked.open_branch().get_stacked_on_url())
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# now we'll upgrade the underlying branch, then upgrade the stacked
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# branch, and this should still work.
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self.scenario_new_format)
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upgrade('base', new_format)
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# in some cases you'll get an error if the underlying model has