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mightyscape-1.1-deprecated/extensions/networkx/generators/tests/test_line.py

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2020-07-30 01:16:18 +02:00
import networkx as nx
import pytest
import networkx.generators.line as line
from networkx.testing.utils import *
def test_node_func():
# graph
G = nx.Graph()
G.add_edge(1, 2)
nf = line._node_func(G)
assert nf(1, 2) == (1, 2)
assert nf(2, 1) == (1, 2)
# multigraph
G = nx.MultiGraph()
G.add_edge(1, 2)
G.add_edge(1, 2)
nf = line._node_func(G)
assert nf(1, 2, 0) == (1, 2, 0)
assert nf(2, 1, 0) == (1, 2, 0)
def test_edge_func():
# graph
G = nx.Graph()
G.add_edge(1, 2)
G.add_edge(2, 3)
ef = line._edge_func(G)
expected = [(1, 2), (2, 3)]
assert_edges_equal(ef(), expected)
# digraph
G = nx.MultiDiGraph()
G.add_edge(1, 2)
G.add_edge(2, 3)
G.add_edge(2, 3)
ef = line._edge_func(G)
expected = [(1, 2, 0), (2, 3, 0), (2, 3, 1)]
result = sorted(ef())
assert expected == result
def test_sorted_edge():
assert (1, 2) == line._sorted_edge(1, 2)
assert (1, 2) == line._sorted_edge(2, 1)
class TestGeneratorLine():
def test_star(self):
G = nx.star_graph(5)
L = nx.line_graph(G)
assert nx.is_isomorphic(L, nx.complete_graph(5))
def test_path(self):
G = nx.path_graph(5)
L = nx.line_graph(G)
assert nx.is_isomorphic(L, nx.path_graph(4))
def test_cycle(self):
G = nx.cycle_graph(5)
L = nx.line_graph(G)
assert nx.is_isomorphic(L, G)
def test_digraph1(self):
G = nx.DiGraph()
G.add_edges_from([(0, 1), (0, 2), (0, 3)])
L = nx.line_graph(G)
# no edge graph, but with nodes
assert L.adj == {(0, 1): {}, (0, 2): {}, (0, 3): {}}
def test_digraph2(self):
G = nx.DiGraph()
G.add_edges_from([(0, 1), (1, 2), (2, 3)])
L = nx.line_graph(G)
assert_edges_equal(L.edges(), [((0, 1), (1, 2)), ((1, 2), (2, 3))])
def test_create1(self):
G = nx.DiGraph()
G.add_edges_from([(0, 1), (1, 2), (2, 3)])
L = nx.line_graph(G, create_using=nx.Graph())
assert_edges_equal(L.edges(), [((0, 1), (1, 2)), ((1, 2), (2, 3))])
def test_create2(self):
G = nx.Graph()
G.add_edges_from([(0, 1), (1, 2), (2, 3)])
L = nx.line_graph(G, create_using=nx.DiGraph())
assert_edges_equal(L.edges(), [((0, 1), (1, 2)), ((1, 2), (2, 3))])
class TestGeneratorInverseLine():
def test_example(self):
G = nx.Graph()
G_edges = [[1, 2], [1, 3], [1, 4], [1, 5], [2, 3], [2, 5], [2, 6],
[2, 7], [3, 4], [3, 5], [6, 7], [6, 8], [7, 8]]
G.add_edges_from(G_edges)
H = nx.inverse_line_graph(G)
solution = nx.Graph()
solution_edges = [('a', 'b'), ('a', 'c'), ('a', 'd'), ('a', 'e'),
('c', 'd'), ('e', 'f'), ('e', 'g'), ('f', 'g')]
solution.add_edges_from(solution_edges)
assert nx.is_isomorphic(H, solution)
def test_example_2(self):
G = nx.Graph()
G_edges = [[1, 2], [1, 3], [2, 3],
[3, 4], [3, 5], [4, 5]]
G.add_edges_from(G_edges)
H = nx.inverse_line_graph(G)
solution = nx.Graph()
solution_edges = [('a', 'c'), ('b', 'c'), ('c', 'd'),
('d', 'e'), ('d', 'f')]
solution.add_edges_from(solution_edges)
assert nx.is_isomorphic(H, solution)
def test_pair(self):
G = nx.path_graph(2)
H = nx.inverse_line_graph(G)
solution = nx.path_graph(3)
assert nx.is_isomorphic(H, solution)
def test_line(self):
G = nx.path_graph(5)
solution = nx.path_graph(6)
H = nx.inverse_line_graph(G)
assert nx.is_isomorphic(H, solution)
def test_triangle_graph(self):
G = nx.complete_graph(3)
H = nx.inverse_line_graph(G)
alternative_solution = nx.Graph()
alternative_solution.add_edges_from([[0, 1], [0, 2], [0, 3]])
# there are two alternative inverse line graphs for this case
# so long as we get one of them the test should pass
assert (nx.is_isomorphic(H, G) or
nx.is_isomorphic(H, alternative_solution))
def test_cycle(self):
G = nx.cycle_graph(5)
H = nx.inverse_line_graph(G)
assert nx.is_isomorphic(H, G)
def test_empty(self):
G = nx.Graph()
H = nx.inverse_line_graph(G)
assert nx.is_isomorphic(H, nx.complete_graph(1))
def test_K1(self):
G = nx.complete_graph(1)
H = nx.inverse_line_graph(G)
solution = nx.path_graph(2)
assert nx.is_isomorphic(H, solution)
def test_claw(self):
# This is the simplest non-line graph
G = nx.Graph()
G_edges = [[0, 1], [0, 2], [0, 3]]
G.add_edges_from(G_edges)
pytest.raises(nx.NetworkXError, nx.inverse_line_graph, G)
def test_non_line_graph(self):
# These are other non-line graphs
# wheel graph with 6 nodes
G = nx.Graph()
G_edges = [[0, 1], [0, 2], [0, 3], [0, 4], [0, 5], [1, 2],
[2, 3], [3, 4], [4, 5], [5, 1]]
G.add_edges_from(G_edges)
pytest.raises(nx.NetworkXError, nx.inverse_line_graph, G)
# 3---4---5
# / \ / \ /
# 0---1---2
G = nx.Graph()
G_edges = [[0, 1], [1, 2], [3, 4], [4, 5], [0, 3], [1, 3],
[1, 4], [2, 4], [2, 5]]
G.add_edges_from(G_edges)
pytest.raises(nx.NetworkXError, nx.inverse_line_graph, G)
# K_5 minus an edge
K5me = nx.complete_graph(5)
K5me.remove_edge(0,1)
pytest.raises(nx.NetworkXError, nx.inverse_line_graph, K5me)
def test_wrong_graph_type(self):
G = nx.DiGraph()
G_edges = [[0, 1], [0, 2], [0, 3]]
G.add_edges_from(G_edges)
pytest.raises(nx.NetworkXNotImplemented, nx.inverse_line_graph, G)
G = nx.MultiGraph()
G_edges = [[0, 1], [0, 2], [0, 3]]
G.add_edges_from(G_edges)
pytest.raises(nx.NetworkXNotImplemented, nx.inverse_line_graph, G)
def test_line_inverse_line_complete(self):
G = nx.complete_graph(10)
H = nx.line_graph(G)
J = nx.inverse_line_graph(H)
assert nx.is_isomorphic(G, J)
def test_line_inverse_line_path(self):
G = nx.path_graph(10)
H = nx.line_graph(G)
J = nx.inverse_line_graph(H)
assert nx.is_isomorphic(G, J)
def test_line_inverse_line_hypercube(self):
G = nx.hypercube_graph(5)
H = nx.line_graph(G)
J = nx.inverse_line_graph(H)
assert nx.is_isomorphic(G, J)
def test_line_inverse_line_cycle(self):
G = nx.cycle_graph(10)
H = nx.line_graph(G)
J = nx.inverse_line_graph(H)
assert nx.is_isomorphic(G, J)
def test_line_inverse_line_star(self):
G = nx.star_graph(20)
H = nx.line_graph(G)
J = nx.inverse_line_graph(H)
assert nx.is_isomorphic(G, J)
def test_line_inverse_line_multipartite(self):
G = nx.complete_multipartite_graph(3, 4, 5)
H = nx.line_graph(G)
J = nx.inverse_line_graph(H)
assert nx.is_isomorphic(G, J)
def test_line_inverse_line_dgm(self):
G = nx.dorogovtsev_goltsev_mendes_graph(4)
H = nx.line_graph(G)
J = nx.inverse_line_graph(H)
assert nx.is_isomorphic(G, J)