def test_node_add_two_items(self):
     node = Node()
     node.add_item("item1")
     node.add_item("item2")
     self.assertEqual(node.items, ["item1", "item2"])
 def test_node_add_item(self):
     node = Node()
     node.add_item("item")
     self.assertEqual(node.items, ["item"])