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#!/usr/bin/env python
from nose.tools import *
from networkx import *
import random
random.seed(0)
def test_double_edge_swap():
graph = barabasi_albert_graph(200,1)
degrees = sorted(graph.degree().values())
G = double_edge_swap(graph, 40)
assert_equal(degrees, sorted(graph.degree().values()))
def test_connected_double_edge_swap():
graph = barabasi_albert_graph(200,1)
degrees = sorted(graph.degree().values())
G = connected_double_edge_swap(graph, 40)
assert_true(is_connected(graph))
assert_equal(degrees, sorted(graph.degree().values()))
@raises(NetworkXError)
def test_double_edge_swap_small():
G = nx.double_edge_swap(nx.path_graph(3))
@raises(NetworkXError)
def test_double_edge_swap_tries():
G = nx.double_edge_swap(nx.path_graph(10),nswap=1,max_tries=0)
@raises(NetworkXError)
def test_connected_double_edge_swap_small():
G = nx.connected_double_edge_swap(nx.path_graph(3))
@raises(NetworkXError)
def test_connected_double_edge_swap_not_connected():
G = nx.path_graph(3)
G.add_path([10,11,12])
G = nx.connected_double_edge_swap(G)
def test_degree_seq_c4():
G = cycle_graph(4)
degrees = sorted(G.degree().values())
G = double_edge_swap(G,1,100)
assert_equal(degrees, sorted(G.degree().values()))
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