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from nose.tools import assert_true, assert_equal,assert_raises
import networkx as nx
def test_stochastic():
G=nx.DiGraph()
G.add_edge(0,1)
G.add_edge(0,2)
S=nx.stochastic_graph(G)
assert_true(nx.is_isomorphic(G,S))
assert_equal(sorted(S.edges(data=True)),
[(0, 1, {'weight': 0.5}),
(0, 2, {'weight': 0.5})])
S=nx.stochastic_graph(G,copy=True)
assert_equal(sorted(S.edges(data=True)),
[(0, 1, {'weight': 0.5}),
(0, 2, {'weight': 0.5})])
def test_stochastic_error():
G=nx.Graph()
assert_raises(Exception,nx.stochastic_graph,G)
G=nx.MultiGraph()
assert_raises(Exception,nx.stochastic_graph,G)
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