'Tests that the cut size is symmetric.'

def test_symmetric(self):

    G = nx.barbell_graph(3, 0)
    S = {0, 1, 4}
    T = {2, 3, 5}
    assert_equal(nx.cut_size(G, S, T), 4)
    assert_equal(nx.cut_size(G, T, S), 4)
