def test_zero_centrality(self):
        G = nx.path_graph(3)
        prev_cc = nx.closeness_centrality(G)
        edge = self.pick_remove_edge(G)
        test_cc = nx.incremental_closeness_centrality(G, edge, prev_cc, insertion=False)
        G.remove_edges_from([edge])
        real_cc = nx.closeness_centrality(G)
        shared_items = set(test_cc.items()) & set(real_cc.items())
        assert len(shared_items) == len(real_cc)
        assert 0 in test_cc.values()