def testCycleNodes(self):
g = DalGraph(make_cycle(3))
c = g.cycle_nodes()
self.assertEqual(c, [], "Cycle Nodes Failed: found cycle less than 3")
g = DalGraph(make_cycle(5))
c = g.cycle_nodes()
self.assertEqual(c, [0, 1, 2, 3, 4 ,0],
"Cycle Nodes Failed: did not find C5")
c5 = make_cycle(5)
c5.add_edge(2,4)
g = DalGraph(c5)
c = g.cycle_nodes()
self.assertEqual(c, [], "Cycle Nodes Failed: did found non-induced C5")
