old_contents: import pytest
  from linked_list import Node
  from linked_list import LinkedList
  
  
  def test_node_init():
      n = Node(3)
  
      assert n.val == 3
      assert n.next is None
  
  
  def test_linkedlist_init():
      l = LinkedList()
      assert l.head is None
  
  
  def test_linkedlist_repr():
      l = LinkedList()
      assert repr(l) == '()'
      l.insert('Bob')
      l.insert(32)
      l.insert('Things')
      assert repr(l) == "('Things', 32, 'Bob')"
  
  
  def test_linkedlist_insert():
      l = LinkedList()
      l.insert('Bob')
      assert l.head.val == 'Bob'
      l.insert(32)
      assert l.head.val == 32
      assert l.head.next.val == 'Bob'
  
  
  def test_linkedlist_pop():
      l = LinkedList()
      a = l.pop()
      assert a is None
  
      l.insert('Bob')
      l.insert(32)
      a = l.pop()
      assert a == 32
      assert l.head.val == 'Bob'
  
  
  def test_linkedlist_size():
      l = LinkedList()
      assert l.size() == 0
  
      l.insert('Bob')
      l.insert(32)
      l.insert('Things')
      assert l.size() == 3
      l.pop()
      assert l.size() == 2
  
  
  def test_linkedlist_search():
      l = LinkedList()
      l.insert('Bob')
      l.insert(32)
      assert l.search(32) == l.head
      assert l.search('Bob') == l.head.next
  
  
  def test_linkedlist_remove():
      l = LinkedList()
      l.insert('Bob')
      l.insert(32)
      l.insert('Things')
      assert l.size() == 3
      l.remove(l.search(32))
      assert l.search(32) is None
      assert l.size() == 2
  
      l.remove(l.search('Things'))
      assert l.search('Things') is None
      assert l.size() == 1
  
      l.remove(l.search('Bob'))
      assert l.search('Bob') is None
      assert l.size() == 0
  
  
  def test_linkedlist_display(capsys):
      l = LinkedList()
      l.insert('Bob')
      l.insert(32)
      l.insert('Things')
      l.display()
      out, err = capsys.readouterr()
      assert out == "('Things', 32, 'Bob')\n"
  
  
  def test_repr():
      l = LinkedList()
      l.insert('Bob')
      l.insert(32)
      l.insert('Things')
      assert l.__repr__() == u"('Things', 32, 'Bob')"
  
  
new_contents: from linked_list import Node
  from linked_list import LinkedList
  
  
  def test_node_init():
      n = Node(3)
  
      assert n.val == 3
      assert n.next is None
  
  
  def test_linkedlist_init():
      l = LinkedList()
      assert l.head is None
  
  
  def test_linkedlist_repr():
      l = LinkedList()
      assert repr(l) == '()'
      l.insert('Bob')
      l.insert(32)
      l.insert('Things')
      assert repr(l) == "('Things', 32, 'Bob')"
  
  
  def test_linkedlist_insert():
      l = LinkedList()
      l.insert('Bob')
      assert l.head.val == 'Bob'
      l.insert(32)
      assert l.head.val == 32
      assert l.head.next.val == 'Bob'
  
  
  def test_linkedlist_pop():
      l = LinkedList()
      a = l.pop()
      assert a is None
  
      l.insert('Bob')
      l.insert(32)
      a = l.pop()
      assert a == 32
      assert l.head.val == 'Bob'
  
  
  def test_linkedlist_size():
      l = LinkedList()
      assert l.size() == 0
  
      l.insert('Bob')
      l.insert(32)
      l.insert('Things')
      assert l.size() == 3
      l.pop()
      assert l.size() == 2
  
  
  def test_linkedlist_search():
      l = LinkedList()
      l.insert('Bob')
      l.insert(32)
      assert l.search(32) == l.head
      assert l.search('Bob') == l.head.next
  
  
  def test_linkedlist_remove():
      l = LinkedList()
      l.insert('Bob')
      l.insert(32)
      l.insert('Things')
      assert l.size() == 3
      l.remove(l.search(32))
      assert l.search(32) is None
      assert l.size() == 2
  
      l.remove(l.search('Things'))
      assert l.search('Things') is None
      assert l.size() == 1
  
      l.remove(l.search('Bob'))
      assert l.search('Bob') is None
      assert l.size() == 0
  
  
  def test_linkedlist_display(capsys):
      l = LinkedList()
      l.insert('Bob')
      l.insert(32)
      l.insert('Things')
      l.display()
      out, err = capsys.readouterr()
      assert out == "('Things', 32, 'Bob')\n"
  
  
  def test_repr():
      l = LinkedList()
      l.insert('Bob')
      l.insert(32)
      l.insert('Things')
      assert l.__repr__() == u"('Things', 32, 'Bob')"
  
subject: remove unused import.