function it_accepts_a_single_argument_of_image_for_gf_command(Image $image) { $image->__toString()->willReturn("FF00"); $image->widthInBytes()->willReturn(2); $image->height()->willReturn(16); $this->gf($image)->__toString()->shouldReturn("^XA\n^GFA,32,32,2,FF00\n^XZ"); }