def test_out_vertices(self): g = Graph([v, w, x], [vw, vx]) assert sorted(g.out_vertices(v)) == sorted([w, x]) assert g.out_vertices(w) == [v, ] assert g.out_vertices(x) == [v, ]
def test_out_vertices_none(self): g = Graph() assert [] == g.out_vertices(v)