def test_size_new_nodes_are_head(self):
ul = UnorderedList()
ul.add(Node('first'))
self.assertEqual(ul.head.data, 'first')
ul.add(Node('second'))
self.assertEqual(ul.head.data, 'second')
self.assertEqual(ul.head.next.data, 'first')
def test_second_node_addition_moves_head(self):
ul = UnorderedList()
ul.add(Node('first'))
first_head = ul.head
ul.add(Node('second'))
second_head = ul.head
self.assertNotEqual(first_head, second_head)
def test_remove(self):
ul = UnorderedList()
ul.add(Node('first'))
ul.add(Node('second'))
ul.add(Node('third'))
self.assertEqual(ul.head.next.data, 'second')
ul.remove('second')
self.assertEqual(ul.head.next.data, 'first')
def test_search_works_with_zero_to_multiple(self):
ul = UnorderedList()
self.assertEqual(ul.search('first'), None)
first_node = Node('first')
ul.add(first_node)
self.assertEqual(ul.search('first'), first_node)
second_first = Node('first')
ul.add(second_first)
self.assertEqual(ul.search('first'), second_first)
def test_size_returns_correct_qty(self):
ul = UnorderedList()
ul.add(Node('first'))
self.assertEqual(ul.size(), 1)
ul.add(Node('second'))
self.assertEqual(ul.size(), 2)
def test_addition_of_first_node(self):
ul = UnorderedList()
ul.add(Node('first'))
self.assertEqual(ul.head.data, 'first')
def test_empty_ul_method_returns_true(self):
ul = UnorderedList()
self.assertEqual(ul.is_empty(), True)
