def test_insert_fist(self, values_to_add, all_values_from_head, all_values_from_tail):
instance = MyDoubleLinkedList()
for value in values_to_add:
instance.insert_first(value)
assert all_values_from_head == instance.all_values_from_head
assert all_values_from_tail == instance.all_values_from_tail
def test_first(self, values_to_add, expected_value, all_values_from_head, all_values_from_tail):
instance = MyDoubleLinkedList()
for value in values_to_add:
instance.insert_first(value)
actual_result = instance.first
assert actual_result == expected_value
assert all_values_from_head == instance.all_values_from_head
assert all_values_from_tail == instance.all_values_from_tail
def test_delete_last(self, values_to_add, expected_deleted_value, all_values_from_head, all_values_from_tail):
instance = MyDoubleLinkedList()
for value in values_to_add:
instance.insert_first(value)
deleted_value = instance.delete_last()
assert deleted_value == expected_deleted_value
assert all_values_from_head == instance.all_values_from_head
assert all_values_from_tail == instance.all_values_from_tail