code: def test_self_inside_method(self):
      x = 1
  
      class Foo:
          def __init__(self):
              self.val = 2
  
          def bar(self):
              def tf_func():
                  return self.val + x
  
              return tf_func
  
      foo = Foo()
      func_map = free_vars_detect._detect_function_free_vars(foo.bar())
      self.assertLen(func_map.keys(), 1)
  
      self.assertIn("tf_func", func_map.keys())
      free_vars = get_var_name(func_map["tf_func"])
      self.assertSequenceEqual(free_vars, ["self", "self.val", "x"])
  
imports: import functools
  import unittest
  from absl.testing import parameterized
  import numpy
  from tensorflow.core.function.capture import free_vars_detect
  from tensorflow.python.util import tf_decorator
label_desc: Use image node_id 19 for calling the FreeVarDetectionTest obj's underlying member method code with example usage: obj.test_self_inside_method() and returns: tf_func, unknown