code: def test_set_vocabulary(self):
      layer = layers.IntegerLookup(
          output_mode="int",
      )
      layer.set_vocabulary([1, 2, 3, 4])
      input_data = [2, 3, 4, 5]
      output = layer(input_data)
      self.assertTrue(backend.is_tensor(output))
      self.assertAllClose(output, np.array([2, 3, 4, 0]))
  
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 4 for calling the IntegerLookupTest obj's underlying member method code with example usage: obj.test_set_vocabulary() without return types