message: Fix BMP header bytes.
diff: @@ -25,14 +25,14 @@ from tensorflow.python.ops import image_ops
  from tensorflow.python.platform import test
  -
  class DecodeBmpOpTest(test.TestCase):
  def testex1(self):
  img_bytes = [[[0, 0, 255], [0, 255, 0]], [[255, 0, 0], [255, 255, 255]]]
  # Encoded BMP bytes from Wikipedia
  + # BMP header bytes: https://en.wikipedia.org/wiki/List_of_file_signatures
  encoded_bytes = [
  - 0x42, 0x40,
  + 0x42, 0x4d,
  0x46, 0, 0, 0,
  0, 0,
  0, 0,
  @@ -66,9 +66,10 @@ class DecodeBmpOpTest(test.TestCase):
  def testGrayscale(self):
  img_bytes = [[[255], [0]], [[255], [0]]]
  + # BMP header bytes: https://en.wikipedia.org/wiki/List_of_file_signatures
  encoded_bytes = [
  0x42,
  - 0x40,
  + 0x4d,
  0x3d,
  0,
  0,
  @@ -133,6 +134,8 @@ class DecodeBmpOpTest(test.TestCase):
  byte_string = bytes(bytearray(encoded_bytes))
  img_in = constant_op.constant(byte_string, dtype=dtypes.string)
  + # TODO(b/159600494): Currently, `decode_bmp` op does not validate input
  + # magic bytes.
  decode = image_ops.decode_bmp(img_in)
  with self.cached_session():
  