def test_top_back_when_single_item_linkedlist(self):
# Arrange
linkedlist = LinkedList()
linkedlist.push_back("Umair")
# Act
topped = linkedlist.top_back()
# Assert
self.assertTrue(linkedlist.size() == 1)
self.assertEqual(topped.data, "Umair")
def test_top_back_when_more_than_one_items_linkedlist(self):
# Arrange
linkedlist = LinkedList()
linkedlist.push_back("Umair")
linkedlist.push_back("Aamir")
# Act
topped = linkedlist.top_back()
# Assert
self.assertTrue(linkedlist.size() == 2)
self.assertEqual(topped.data, "Aamir")
