code: def test_empty_get_current_pod_name_returns_none():
      with patch(
          "ray._private.accelerators.tpu.TPUAcceleratorManager.get_current_node_tpu_name",
          return_value="",
      ):
          name = ray.util.accelerators.tpu.get_current_pod_name()
      assert name is None
  
imports: import os
  import sys
  import mock
  import pytest
  import requests
  from unittest.mock import patch
  import ray
  from ray._private.accelerators import TPUAcceleratorManager
  from ray._private.accelerators import tpu
label_desc: Use image node_id 13 for calling a global function with example usage: test_empty_get_current_pod_name_returns_none() without return types