def test_get_by_id_negative(self):
n1, n2, n3, n4, n5, n6, n7, n8, n9, n10 = get_nodes()
s = Nodes([n1, n2, n3])
with self.assertRaises(ValueError):
s.from_id(4)
def test_get_by_id_positive(self):
n1, n2, n3, n4, n5, n6, n7, n8, n9, n10 = get_nodes()
s = Nodes([n1, n2, n3])
self.assertEqual(s.from_id(1), n1)
self.assertEqual(s.from_id(2), n2)
self.assertEqual(s.from_id(3), n3)
