code: def test_config(self):
      self.config_tester.run_common_tests()
  
imports: import unittest
  from transformers import is_tf_available
  from transformers.testing_utils import require_sentencepiece, require_tf, require_tokenizers, slow, tooslow
  from ...test_configuration_common import ConfigTester
  from ...test_modeling_tf_common import TFModelTesterMixin, ids_tensor, random_attention_mask
label_desc: Use image node_id 2 for calling the TFLongformerModelTest obj's underlying member method code with example usage: obj.test_config() without return types