code: def test_config(self):
      layer = layers.IntegerLookup(
          output_mode="int",
          vocabulary=[1, 2, 3],
          oov_token=1,
          mask_token=0,
      )
      self.run_class_serialization_test(layer)
  
file_path: keras/keras/layers/preprocessing/integer_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 IntegerLookupTest obj's underlying member method code with example usage: obj.test_config() without return types