def test_cycles_simple():
network = Network()
network.add_node("A")
network.add_node("B")
network.add_edge("A", "B")
network.add_edge("B", "A")
assert chash(network.cycles()) == chash([("A", "B", "A")])
def test_cycles_complex():
network = Network()
network.add_node("A")
network.add_node("B")
network.add_node("C")
network.add_node("D")
network.add_edge("A", "B")
network.add_edge("B", "C")
network.add_edge("C", "D")
network.add_edge("D", "A")
network.add_edge("D", "C")
network.add_edge("C", "B")
network.add_edge("B", "D")
# with open("/home/tag/debug.dot", 'w') as fd:
# fd.write(network.dot())
assert chash(network.cycles()) == chash([
('B', 'C', 'B'),
('C', 'D', 'C'),
('A', 'B', 'D', 'A')
])