def test_insert_end(self):
"""
test insert_end()
"""
# test insert_end on empty linked list
list1 = CircularLinkedList()
key = 10
list1.insert_end(key)
self.assertEqual(list(list1), [key])
# generate linked list using insert_end
nums = 10
list1, reference_arr = generate_filled_list(CircularLinkedList, nums)
list_arr = list(list1)
self.assertEqual(list_arr, reference_arr)
# test list from last to first
key = get_key_from_last_to_first(list1.fild_last_node())
self.assertEqual(key, reference_arr[::-1])
def test_len(self):
"""
test __len__()
"""
# test on empty linked list
list1 = CircularLinkedList()
self.assertEqual(len(list1), 0)
# test on linked list with 1 node
list1 = CircularLinkedList()
list1.insert_end(1)
self.assertEqual(len(list1), 1)
# generate linked list
nums = 10
list1 = generate_filled_list(CircularLinkedList, nums, with_ref=False)
# test len()
self.assertEqual(len(list1), nums)