code: def __init__(self, test_instance, expected_ctx):
      self.at_top_level = True
      self.test_instance = test_instance
      self.expected_ctx = expected_ctx
  
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 1 to create a new _CtxChecker object from inherited base classes: gast with example: obj = _CtxChecker(test_instance, expected_ctx)