def test_directed_edge_get(self):
""" Get an attribute of a directed edge """
v0 = DirectedVertex(val='v0')
v1 = DirectedVertex(val='v1')
e01 = DirectedEdge((v0, v1), attrs={'weight': 5})
self.assertEqual(e01.get('weight'), 5)
self.assertIsNone(e01.get('notthere'))
