662
662
self.assertRaises(NotImplementedError, vf.get_parents_with_ghosts, 'foo')
663
663
self.assertRaises(NotImplementedError, vf.get_graph_with_ghosts)
665
666
# test key graph related apis: getncestry, _graph, get_parents
667
668
# - these are ghost unaware and must not be reflect ghosts