code: def test_get_inputs_source_from_py_var_invalid_name(self):
      with self.assertRaisesRegex(NameError, "UnknownVar"):
          input_utils.get_inputs_source_from_py_var("UnknownVar")
  
file_path: generative-ai-python/tests/notebook/tet_input_utils.py
imports: from __future__ import annotations
  import sys
  from unittest import mock
  from absl.testing import absltest
  from google.generativeai.notebook import input_utils
label_desc: Use image node_id 1 for calling the InputUtilsTest obj's underlying member method code with example usage: obj.test_get_inputs_source_from_py_var_invalid_name() without return types