67 lines
2.3 KiB
Python
67 lines
2.3 KiB
Python
#!/usr/bin/env python
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import pytest
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import networkx as nx
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from networkx import NetworkXNotImplemented
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class TestWeaklyConnected:
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@classmethod
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def setup_class(cls):
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cls.gc = []
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G = nx.DiGraph()
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G.add_edges_from([(1, 2), (2, 3), (2, 8), (3, 4), (3, 7), (4, 5),
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(5, 3), (5, 6), (7, 4), (7, 6), (8, 1), (8, 7)])
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C = [[3, 4, 5, 7], [1, 2, 8], [6]]
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cls.gc.append((G, C))
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G = nx.DiGraph()
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G.add_edges_from([(1, 2), (1, 3), (1, 4), (4, 2), (3, 4), (2, 3)])
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C = [[2, 3, 4], [1]]
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cls.gc.append((G, C))
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G = nx.DiGraph()
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G.add_edges_from([(1, 2), (2, 3), (3, 2), (2, 1)])
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C = [[1, 2, 3]]
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cls.gc.append((G, C))
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# Eppstein's tests
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G = nx.DiGraph({0: [1], 1: [2, 3], 2: [4, 5], 3: [4, 5], 4: [6], 5: [], 6: []})
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C = [[0], [1], [2], [3], [4], [5], [6]]
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cls.gc.append((G, C))
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G = nx.DiGraph({0: [1], 1: [2, 3, 4], 2: [0, 3], 3: [4], 4: [3]})
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C = [[0, 1, 2], [3, 4]]
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cls.gc.append((G, C))
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def test_weakly_connected_components(self):
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for G, C in self.gc:
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U = G.to_undirected()
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w = {frozenset(g) for g in nx.weakly_connected_components(G)}
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c = {frozenset(g) for g in nx.connected_components(U)}
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assert w == c
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def test_number_weakly_connected_components(self):
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for G, C in self.gc:
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U = G.to_undirected()
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w = nx.number_weakly_connected_components(G)
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c = nx.number_connected_components(U)
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assert w == c
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def test_is_weakly_connected(self):
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for G, C in self.gc:
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U = G.to_undirected()
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assert nx.is_weakly_connected(G) == nx.is_connected(U)
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def test_null_graph(self):
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G = nx.DiGraph()
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assert list(nx.weakly_connected_components(G)) == []
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assert nx.number_weakly_connected_components(G) == 0
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pytest.raises(nx.NetworkXPointlessConcept, nx.is_weakly_connected, G)
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def test_connected_raise(self):
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G = nx.Graph()
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pytest.raises(NetworkXNotImplemented, nx.weakly_connected_components, G)
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pytest.raises(NetworkXNotImplemented, nx.number_weakly_connected_components, G)
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pytest.raises(NetworkXNotImplemented, nx.is_weakly_connected, G)
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