Update lib.rs

Author: itsybitesyspider

src/lib.rs

@@ -833,6 +833,18 @@ mod test {
             .or_insert_with(|| X(1, 0));
     }
 
+    #[test]
+    fn test_duplicate_clean() {
+        let mut storage: Storage<u64,u64,X> = Storage::new();
+
+        storage.add(X(0,0));
+
+        storage.entry(&ID.chunk(0).item(0));
+        storage.remove(&ID.chunk(0).item(0));
+
+        storage.validate();
+    }
+
     #[test]
     fn test_str() {
         let mut storage: Storage<str, str, S> = Storage::new();