code: def test_ensure_graph_fail():
      """Test that super_serial fails in graph mode."""
      with pytest.raises(ValueError):
          graph_save_fail()
  
file_path: io/tests/test_serial_ops.py
imports: import os
  import tempfile
  import numpy
  import pytest
  import tensorflow
  import tensorflow_io
label_desc: Use image node_id 3 for calling a global function with example usage: test_ensure_graph_fail() without return types