def test_get_at_index(self):
dll = DoublyLinkedList(['A', 'B', 'C'])
assert dll.get_at_index(0) == 'A'
assert dll.get_at_index(1) == 'B'
assert dll.get_at_index(2) == 'C'
with self.assertRaises(ValueError):
dll.get_at_index(3)
dll.get_at_index(-1)
def test_get_at_index(self):
ll = DoublyLinkedList(['A', 'B', 'C'])
assert ll.get_at_index(0) == 'A' # head item
assert ll.get_at_index(1) == 'B' # middle item
assert ll.get_at_index(2) == 'C' # tail item
with self.assertRaises(ValueError):
ll.get_at_index(3) # index too high
with self.assertRaises(ValueError):
ll.get_at_index(-1) # index too low
