old_contents: from linked_list import Node
  from linked_list import LinkedList
  
  
  def test_node_data():
      newNode = Node("Bob")
      assert newNode.data == "Bob"
  
  
  def test_node_add():
      newNode = Node("Bob")
      newList = LinkedList()
      newList.insert(newNode)
      assert newList.firstNode.data == "Bob"
  
new_contents: from linked_list import Node
  from linked_list import LinkedList
  
  
  def test_node_data():
      newNode = Node("Bob")
      assert newNode.data == "Bob"
  
  
  def test_node_add():
      bob = Node("Bob")
      newList = LinkedList()
      newList.insert(bob)
      assert newList.firstNode.data == "Bob"
  
  
  def test_next_node_none():
      bob = Node("Bob")
      newList = LinkedList()
      newList.insert(bob)
      assert newList.firstNode.nextNode is None
  
  
  def test_add_second_node():
      joe = Node("Joe")
      bob = Node("Bob")
      newList = LinkedList()
      newList.insert(bob)
      newList.insert(joe)
      assert newList.firstNode.nextNode.data == "Bob"
  
subject: Add multi-node tests