diff --git a/src/index.rs b/src/index.rs
index 0bf3af9..86ea82d 100644
--- a/src/index.rs
+++ b/src/index.rs
@@ -86,16 +86,16 @@ fn test() {
     use std::{thread::sleep, time::Duration};
 
     // test values auto-clean by timeout
-    let mut index = Index::init(2, Some(3), false, false);
+    let mut i = Index::init(2, Some(3), false, false);
 
-    index.insert("h1".to_string(), 0, None, None);
+    i.insert("h1".to_string(), 0, None, None);
     sleep(Duration::from_secs(1));
-    index.insert("h2".to_string(), 0, None, None);
+    i.insert("h2".to_string(), 0, None, None);
 
-    index.refresh();
-    assert_eq!(index.len(), 2);
+    i.refresh();
+    assert_eq!(i.len(), 2);
 
     sleep(Duration::from_secs(2));
-    index.refresh();
-    assert_eq!(index.len(), 1);
+    i.refresh();
+    assert_eq!(i.len(), 1)
 }