code: def test_children(self):
      root = autotrackable.AutoTrackable()
      root.leaf = autotrackable.AutoTrackable()
      root_ckpt = trackable_utils.Checkpoint(root=root)
      root_save_path = root_ckpt.save(
          os.path.join(self.get_temp_dir(), "root_ckpt")
      )
      current_name, node_id = next(
          iter(
              checkpoint_view.CheckpointView(root_save_path)
              .children(0)
              .items()
          )
      )
      self.assertEqual("leaf", current_name)
      self.assertEqual(1, node_id)
  
file_path: tensorflow/tensorflow/python/checkpoint/checkpoint_view_test.py
imports: import os
  from tensorflow.python.checkpoint import checkpoint
  from tensorflow.python.checkpoint import checkpoint_view
  from tensorflow.python.eager import test
  from tensorflow.python.trackable import autotrackable
label_desc: Use image node_id 1 for calling the CheckpointViewTest obj's underlying member method code with example usage: obj.test_children() without return types