code: def test_non_function_input(self):
      x = 1
  
      class Foo:
          def bar(self):
              return x
  
      foo = Foo()
      txt = free_vars_detect.generate_free_var_logging(foo)
      self.assertIsNone(txt)
  
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 3 for calling the GenerateLoggingTest obj's underlying member method code with example usage: obj.test_non_function_input() and returns: x