def test_graph_4_2_ex_1b(self): self.assertTrue(detect_cycle(GRAPH_4_2_EX_1B))
def test_graph_4_2_ex_1a(self): self.assertFalse(detect_cycle(GRAPH_4_2_EX_1A))
def test_graph_4_5(self): self.assertTrue(detect_cycle(GRAPH_4_5))
def test_graph_4_6(self): self.assertFalse(detect_cycle(GRAPH_4_6))
def test_graph_3_12b(self): self.assertTrue(detect_cycle(GRAPH_3_12B))