code: def test_undefined(self):
      undefined_symbol = variables.Undefined("name")
      undefined_symbol2 = variables.Undefined("name")
  
      self.assertEqual(undefined_symbol.symbol_name, "name")
      self.assertEqual(undefined_symbol2.symbol_name, "name")
      self.assertNotEqual(undefined_symbol, undefined_symbol2)
  
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 1 for calling the SpecialValuesTest obj's underlying member method code with example usage: obj.test_undefined() without return types