test_graph.py 文件源码

def test_is_connected_three_vert_two_connections():
    a = Vertex(Vertex._make_test_vertex())
    b = Vertex(Vertex._make_test_vertex())
    c = Vertex(Vertex._make_test_vertex())
    a.add_edge(Edge(b))
    b.add_edge(Edge(c))
    c.add_edge(Edge(a))
    g = Graph([a, b, c])
    assert g.is_connected()