code: def test_config(self):
      layer = layers.StringLookup(
          output_mode="int",
          vocabulary=["a", "b", "c"],
          oov_token="[OOV]",
          mask_token="[MASK]",
      )
      self.run_class_serialization_test(layer)
  
file_path: keras/keras/layers/preprocessing/string_lookup_test.py
imports: import numpy
  from tensorflow import data
  from keras import backend
  from keras import layers
  from keras import testing
label_desc: Use image node_id 1 for calling the StringLookupTest obj's underlying member method code with example usage: obj.test_config() without return types