'Tests that each directed edge is counted once in the cut.'

def test_directed(self):

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