| #!/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))]) |
| |