File: test_contextmanager.py

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python-networkx 1.9%2Bdfsg1-1
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from __future__ import absolute_import

from nose.tools import *

import networkx as nx

def test_reversed():
    G = nx.DiGraph()
    G.add_edge('A', 'B')

    # no exception
    with nx.utils.reversed(G):
        pass
    assert_true('B' in G['A'])

    # exception
    try:
        with nx.utils.reversed(G):
            raise Exception
    except:
        assert_true('B' in G['A'])