92 lines
3.1 KiB
Python
92 lines
3.1 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 convert_node_labels_to_integers as cnlti
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from networkx import NetworkXNotImplemented
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class TestConnected:
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@classmethod
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def setup_class(cls):
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G1 = cnlti(nx.grid_2d_graph(2, 2), first_label=0, ordering="sorted")
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G2 = cnlti(nx.lollipop_graph(3, 3), first_label=4, ordering="sorted")
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G3 = cnlti(nx.house_graph(), first_label=10, ordering="sorted")
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cls.G = nx.union(G1, G2)
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cls.G = nx.union(cls.G, G3)
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cls.DG = nx.DiGraph([(1, 2), (1, 3), (2, 3)])
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cls.grid = cnlti(nx.grid_2d_graph(4, 4), first_label=1)
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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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G = nx.DiGraph()
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C = []
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cls.gc.append((G, C))
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def test_connected_components(self):
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cc = nx.connected_components
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G = self.G
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C = {
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frozenset([0, 1, 2, 3]),
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frozenset([4, 5, 6, 7, 8, 9]),
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frozenset([10, 11, 12, 13, 14])
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}
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assert {frozenset(g) for g in cc(G)} == C
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def test_number_connected_components(self):
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ncc = nx.number_connected_components
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assert ncc(self.G) == 3
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def test_number_connected_components2(self):
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ncc = nx.number_connected_components
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assert ncc(self.grid) == 1
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def test_connected_components2(self):
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cc = nx.connected_components
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G = self.grid
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C = {frozenset([1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16])}
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assert {frozenset(g) for g in cc(G)} == C
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def test_node_connected_components(self):
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ncc = nx.node_connected_component
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G = self.grid
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C = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16}
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assert ncc(G, 1) == C
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def test_is_connected(self):
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assert nx.is_connected(self.grid)
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G = nx.Graph()
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G.add_nodes_from([1, 2])
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assert not nx.is_connected(G)
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def test_connected_raise(self):
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pytest.raises(NetworkXNotImplemented, nx.connected_components, self.DG)
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pytest.raises(NetworkXNotImplemented, nx.number_connected_components, self.DG)
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pytest.raises(NetworkXNotImplemented, nx.node_connected_component, self.DG, 1)
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pytest.raises(NetworkXNotImplemented, nx.is_connected, self.DG)
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pytest.raises(nx.NetworkXPointlessConcept, nx.is_connected, nx.Graph())
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