TEST ()

{

  GeglBuffer    *buffer, *buffer2;

  GeglRectangle  bound = {0, 0, 20, 20};

  test_start ();

  buffer = gegl_buffer_new (&bound, babl_format ("Y float"));

  vgrad (buffer);

  buffer2 = gegl_buffer_dup (buffer);

  g_object_unref (buffer2);

  print_buffer (buffer);

  g_object_unref (buffer);

  test_end ();

}