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def test_set_and_read_unicode(self):
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tree = self.make_branch_and_tree('a-tree')
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# setting the root id allows it to be read via get_root_id.
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old_id = tree.get_root_id()
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# set root id should not have triggered a flush of the tree,
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# so check a new tree sees the old state.
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reference_tree = tree.bzrdir.open_workingtree()