code: def test_preprocess_image(self):
      image = np.zeros((100, 50, 3), dtype=np.uint8)
      processed = self.model.preprocess_image(image)
      self.assertEqual(processed.dtype, np.float32)
      input_size = self.model.config.dataset_configs.input_size
      chex.assert_shape(processed, (input_size, input_size, 3))
  
file_path: scenic/scenic/projects/owl_vit/notebooks/tests/inference_test.py
imports: from unittest import mock
  from absl.testing import absltest
  import chex
  import jax
  import jax.numpy
  import numpy
  from scenic.projects.owl_vit import models
  from scenic.projects.owl_vit.configs import clip_b32
  from scenic.projects.owl_vit.notebooks import inference
label_desc: Use image node_id 3 for calling the InferenceTest obj's underlying member method code with example usage: obj.test_preprocess_image() without return types