code: def test_replace_tuple(self):
      template = """
        def test_fn(a, c):
          return b,
      """
  
      node = templates.replace(template, b=("a", "c"))[0]
      result, _, _ = loader.load_ast(node)
  
      self.assertEqual((2, 3), result.test_fn(2, 3))
  
imports: import types
  from absl.testing import parameterized
  import gast
  from tensorflow.python.autograph.pyct import loader
  from tensorflow.python.autograph.pyct import parser
  from tensorflow.python.autograph.pyct import qual_names
  from tensorflow.python.autograph.pyct import templates
  from tensorflow.python.platform import test
label_desc: Use image node_id 2 for calling the TemplatesTest obj's underlying member method code with example usage: obj.test_replace_tuple() without return types