def test_one(self):
self.G.add_edges_from([(1, 2)])
root = _get_root(self.G)
gold = 1
self.assertEqual(root, gold)
def test_two(self):
self.G.add_edges_from([(1, 2), (2, 3), (3, 4), (4, 6), (3, 5), (4, 7)])
root = _get_root(self.G)
gold = 1
self.assertEqual(root, gold)
