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import networkx as nx
from networkx.algorithms import 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
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