code: def testJpeg(self):
      # Read a real jpeg and verify shape
      path = os.path.join(
          prefix_path, "jpeg", "testdata", "jpeg_merge_test1.jpg"
      )
      with self.session():
          jpeg0 = io_ops.read_file(path)
          image0 = image_ops.decode_image(jpeg0)
          image1 = image_ops.decode_jpeg(jpeg0)
          jpeg0, image0, image1 = self.evaluate([jpeg0, image0, image1])
          self.assertEqual(len(jpeg0), 3771)
          self.assertEqual(image0.shape, (256, 128, 3))
          self.assertAllEqual(image0, image1)
  
          with self.assertRaises(errors_impl.InvalidArgumentError):
              bad_channels = image_ops.decode_image(jpeg0, channels=4)
              self.evaluate(bad_channels)
  
file_path: tensorflow-upstream/tensorflow/python/kernel_tests/image_ops/decode_image_op_test.py
imports: import os.path
  import numpy
  from tensorflow.python.framework import errors_impl
  from tensorflow.python.framework import test_util
  from tensorflow.python.ops import image_ops
  from tensorflow.python.ops import io_ops
  import tensorflow.python.ops.nn_grad
  from tensorflow.python.platform import test
label_desc: Use image node_id 3 for calling the DecodeImageOpTest obj's underlying member method code with example usage: obj.testJpeg() without return types