def test_directed_edge_attrs(self):
""" Get an directed edge's attrs property """
v0 = DirectedVertex(val='v0')
v1 = DirectedVertex(val='v1')
e01 = DirectedEdge((v0, v1), {'weight': 5})
self.assertEqual(e01.attrs, {'weight': 5})
with self.assertRaises(AttributeError):
e01.attrs = {'key': 'value'}
