def test_add_two_elements_to_beginning_of_linked_list(self):
linked_list = LinkedList()
linked_list.add_first('python')
linked_list.add_first('ruby')
self.assertEqual('python', linked_list.get_last().item)
self.assertEqual('ruby', linked_list.get_first().item)
self.assertEqual(2, linked_list.size())
