def test_single_edge(self):
a = [0]
b = [1]
a.append(b)
graph = ObjectGraph([a, b])
self.assertEqual(len(graph), 2)
self.assertEqual(graph.references(), [(a, b)])
def test_multiple_edges(self):
a = [0]
b = [1]
a.append(b)
a.append(b)
graph = ObjectGraph([a, b])
self.assertEqual(graph.references(), [(a, b), (a, b)])
def test_simple_cycle(self):
a = [0]
b = [1]
a.append(b)
b.append(a)
graph = ObjectGraph([a, b])
self.assertCountEqual(graph.references(), [(a, b), (b, a)])
def test_self_reference(self):
a = [0]
a.append(a)
graph = ObjectGraph([a])
self.assertEqual(graph.references(), [(a, a)])
