Update limit test

object_store/src/limit.rs

@@ -290,20 +290,15 @@ mod tests {
         rename_and_copy(&integration).await;
         stream_get(&integration).await;
 
-        let mut futures = Vec::with_capacity(max_requests);
-        for _ in 0..max_requests {
-            let stream = integration.list_with_delimiter(None);
-            futures.push(stream);
-        }
-
-        let t = Duration::from_millis(20);
+        let _permits = integration.semaphore.acquire_many(9).await.unwrap();
+        let droppable = integration.semaphore.acquire().await.unwrap();
 
         // Expect to not be able to make another request
+        let t = Duration::from_millis(20);
         let fut = integration.list(None).collect::<Vec<_>>();
         assert!(timeout(t, fut).await.is_err());
 
-        // Drop one of the futures
-        futures.pop();
+        drop(droppable);
 
         // Can now make another request
         integration.list(None).collect::<Vec<_>>().await;