TEST ()

{

  GeglBuffer    *buffer, *sub, *subsub;

  GeglRectangle  subrect =    {5, 5, 10, 10};

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

  test_start ();

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

  sub = gegl_buffer_create_sub_buffer (buffer, &subrect);

  fill (sub, 0.5);

  subsub = g_object_new (GEGL_TYPE_BUFFER,

                         "source", sub,

                         "x", 5,

                         "y", 5,

                         "width", 6,

                         "height", 6,

                         "shift-x", 8,

                         NULL);

  fill (subsub, 1.0);

  print_buffer (buffer);

  g_object_unref (sub);

  g_object_unref (subsub);

  g_object_unref (buffer);

  test_end ();

}