def test_reverse_when_linkedlist_is_empty(self):
# Arrange
linkedlist = LinkedList()
# Act
linkedlist.reverse()
# Assert
self.assertFalse(linkedlist.head)
def test_reverse_when_single_item_linkedlist(self):
# Arrange
linkedlist = LinkedList()
linkedlist.push_back("Umair")
# Act
linkedlist.reverse()
# Assert
self.assertTrue(linkedlist.head and linkedlist.head.data == "Umair")
def test_reverse_when_more_than_two_items_linkedlist(self):
# Arrange
linkedlist = LinkedList()
linkedlist.push_back("Umair")
linkedlist.push_back("Aamir")
linkedlist.push_back("Usman")
# Act
linkedlist.reverse()
# Assert
self.assertTrue(linkedlist.head and linkedlist.head.data == "Usman")