code: def test_node_creation():
      """Test empty initialization of tree node"""
      TreeNode("test")
      TreeNode("test", None, tuple())
  
imports: from orion.core.utils.tree import DepthFirstTraversal, PreOrderTraversal, TreeNode, flattened
label_desc: Use image node_id 2 for calling a global function with example usage: test_node_creation() without return types