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#!/usr/bin/env python
"""line graph
----------
"""
import networkx as nx
from nose.tools import *
class TestGeneratorLine():
def test_line(self):
G=nx.star_graph(5)
L=nx.line_graph(G)
assert_true(nx.is_isomorphic(L,nx.complete_graph(5)))
G=nx.path_graph(5)
L=nx.line_graph(G)
assert_true(nx.is_isomorphic(L,nx.path_graph(4)))
G=nx.cycle_graph(5)
L=nx.line_graph(G)
assert_true(nx.is_isomorphic(L,G))
G=nx.DiGraph()
G.add_edges_from([(0,1),(0,2),(0,3)])
L=nx.line_graph(G)
assert_equal(L.adj, {})
G=nx.DiGraph()
G.add_edges_from([(0,1),(1,2),(2,3)])
L=nx.line_graph(G)
assert_equal(sorted(L.edges()), [((0, 1), (1, 2)), ((1, 2), (2, 3))])
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