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def test_nested_commit(self):
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"""Commit in multiply-nested trees"""
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subtree = self.make_branch_and_tree('subtree',
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subsubtree = self.make_branch_and_tree('subtree/subtree',
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subtree.add_reference(subsubtree)
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tree.add_reference(subtree)
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tree.commit('added reference', allow_pointless=False)