def testFindClaw(self):
g = DalGraph(make_claw())
# add some noise
g._g.add_node(6)
g._g.add_node(7)
g._g.add_edge(1, 6)
g._g.add_edge(3, 7)
result = g.find_claw()
expect = [1, 3, 2, 0]
self.assertEqual(result, expect)
# no triangle
g = DalGraph(make_co_claw())
result = g.find_claw()
expect = None
self.assertEqual(result, expect)
g = DalGraph(make_wheel(6))
result = g.find_claw()
self.assertEqual(result, expect)
