def setUp(self):
graph = DiGraph()
graph.add_cycle([1, 2, 3, 4])
graph.add_cycle([5, 6, 7, 8])
graph.add_node(0)
graph.add_edge(9, 10)
self.graph_1 = graph
graph = DiGraph()
graph.add_cycle([1, 2, 3, 4])
graph.add_cycle([5, 6, 7, 8])
graph.add_node(0)
graph.add_edge(9, 10)
graph.add_edge(3, 9)
graph.add_edge(10, 7)
self.graph_2 = graph
