code: def test_undefined_operations(self):
      undefined_symbol = variables.Undefined("name")
  
      self.assertIsInstance(undefined_symbol.foo, variables.Undefined)
      self.assertIsInstance(undefined_symbol[0], variables.Undefined)
      self.assertNotIsInstance(
          undefined_symbol.__class__, variables.Undefined
      )
  
file_path: tensorflow-upstream/tensorflow/python/autograph/operators/variables_test.py
imports: from tensorflow.python.autograph.operators import variables
  from tensorflow.python.platform import test
label_desc: Use image node_id 2 for calling the SpecialValuesTest obj's underlying member method code with example usage: obj.test_undefined_operations() without return types