44 lines
1.5 KiB
Python
44 lines
1.5 KiB
Python
|
# Copyright 2016-2019 NetworkX developers.
|
||
|
# Copyright (C) 2016 by
|
||
|
# Nishant Nikhil <nishantiam@gmail.com>
|
||
|
# All rights reserved.
|
||
|
# BSD license.
|
||
|
|
||
|
import networkx as nx
|
||
|
import networkx.algorithms.bipartite as bipartite
|
||
|
|
||
|
|
||
|
class TestMinEdgeCover:
|
||
|
"""Tests for :func:`networkx.algorithms.bipartite.min_edge_cover`"""
|
||
|
|
||
|
def test_empty_graph(self):
|
||
|
G = nx.Graph()
|
||
|
assert bipartite.min_edge_cover(G) == set()
|
||
|
|
||
|
def test_graph_single_edge(self):
|
||
|
G = nx.Graph()
|
||
|
G.add_edge(0, 1)
|
||
|
assert (bipartite.min_edge_cover(G) ==
|
||
|
{(0, 1), (1, 0)})
|
||
|
|
||
|
def test_bipartite_default(self):
|
||
|
G = nx.Graph()
|
||
|
G.add_nodes_from([1, 2, 3, 4], bipartite=0)
|
||
|
G.add_nodes_from(['a', 'b', 'c'], bipartite=1)
|
||
|
G.add_edges_from([(1, 'a'), (1, 'b'), (2, 'b'),
|
||
|
(2, 'c'), (3, 'c'), (4, 'a')])
|
||
|
min_cover = bipartite.min_edge_cover(G)
|
||
|
assert nx.is_edge_cover(G, min_cover)
|
||
|
assert len(min_cover) == 8
|
||
|
|
||
|
def test_bipartite_explicit(self):
|
||
|
G = nx.Graph()
|
||
|
G.add_nodes_from([1, 2, 3, 4], bipartite=0)
|
||
|
G.add_nodes_from(['a', 'b', 'c'], bipartite=1)
|
||
|
G.add_edges_from([(1, 'a'), (1, 'b'), (2, 'b'),
|
||
|
(2, 'c'), (3, 'c'), (4, 'a')])
|
||
|
min_cover = bipartite.min_edge_cover(G,
|
||
|
bipartite.eppstein_matching)
|
||
|
assert nx.is_edge_cover(G, min_cover)
|
||
|
assert len(min_cover) == 8
|