Parameterized tests. Include pixels/s.

src/library.rs

@@ -55,7 +55,7 @@ pub fn resize(
     img.resize_to_fill(w, h, filter)
 }
 
-pub fn save_to_jpeg_bytes(img: DynamicImage) -> ImageResult<Vec<u8>> {
+pub fn save_to_jpeg_bytes(img: &DynamicImage) -> ImageResult<Vec<u8>> {
     let mut buf = Vec::new();
     img.write_to(&mut buf, ImageFormat::Jpeg)?;
     Ok(buf)
@@ -203,8 +203,8 @@ impl Library {
                 let orig_img =
                     load_image(&path).map_err(|e| io::Error::new(io::ErrorKind::Other, e))?;
                 let img = resize(&orig_img, dimensions, filter);
-                let buf =
-                    save_to_jpeg_bytes(img).map_err(|e| io::Error::new(io::ErrorKind::Other, e))?;
+                let buf = save_to_jpeg_bytes(&img)
+                    .map_err(|e| io::Error::new(io::ErrorKind::Other, e))?;
                 Ok(buf)
             }
         }