code: def test_str_to_pil(self):
      image_str = image_utils.convert_pil_to_image_str(_TEST_IMAGE_RGB)
      pil_image = image_utils.convert_image_str_to_pil(image_str)
      image_array = np.asarray(pil_image)
      np.testing.assert_array_equal(_TEST_IMAGE_ARRAY, image_array)
  
file_path: lit/lit_nlp/lib/image_utils_test.py
imports: from absl.testing import absltest
  from absl.testing import parameterized
  from lit_nlp.lib import image_utils
  import numpy
  from PIL import Image
label_desc: Use image node_id 2 for calling the ImageUtilsTest obj's underlying member method code with example usage: obj.test_str_to_pil() without return types