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# At this point, we have a format6 branch without checkout files.
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upgrade.upgrade('.', bzrdir.BzrDirMetaFormat1())
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# The upgrade should not have set up a working tree.
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self.assertFalse(control.has_workingtree())
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# We have covered the scope of this test, we may as well check that
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# upgrade has not eaten our data, even if it's a bit redundant with