Update test

src/config/mod.rs

@@ -61,11 +61,11 @@ where
 }
 
 #[test]
-fn test() {
+fn test_double_window_mut() {
     let mut data: Vec<u8> = vec![1, 2, 3, 4, 5];
     double_window_mut(&mut data[..], |prev, next| {
         println!("Prev: {}, Next: {}", prev, next);
-        *next = *prev * 2;
+        *next = *next + *prev;
     });
-    assert_eq!(data, vec![1, 2, 4, 8, 16]);
+    assert_eq!(data, vec![1, 3, 6, 10, 15]);
 }