public function test_800x0_no_crop() {
    // Landscape: resize 640x480 to fit 800w.
    $out = image_resize_dimensions( 640, 480, 800, 0, false );
    // dst_x, dst_y, src_x, src_y, dst_w, dst_h, src_w, src_h.
    $this->assertFalse( $out );

    // Portrait: resize 480x640 to fit 800w.
    $out = image_resize_dimensions( 480, 640, 800, 0, false );
    // dst_x, dst_y, src_x, src_y, dst_w, dst_h, src_w, src_h.
    $this->assertFalse( $out );
  }