Quota pallet benchmark

pallets/quota/src/benchmarking.rs

@@ -108,4 +108,16 @@ assert_has_event::<T>(Event::<T>::RefundFailed ( account ).into());
     verify {
 assert_has_event::<T>(Event::<T>::RefundFailed ( account ).into());
     }
+    process_refund_queue {
+        let account: T::AccountId = account("Alice", 1, 1);
+        let dummy_refund = Refund {
+            account: account.clone(),
+            identity: 0u32.into(),
+            amount: 20u64.into(),
+        };
+        // Worst case scenario: the queue is full, and the available weight is maximal.
+        for i in 0 .. MAX_QUEUED_REFUNDS {
+            Pallet::<T>::queue_refund(dummy_refund.clone())
+        }
+    }: { Pallet::<T>::process_refund_queue(Weight::MAX) }
 }