refine queue test

src/tests.rs

@@ -912,18 +912,20 @@ fn queue() {
 
             let n = rng.gen_range(1..20);
             for _ in 0..n {
-                if rng.gen_bool(0.6) || root.length(transaction) == 0 {
                 let how_many = rng.gen_range(1..20);
+                if rng.gen_bool(0.6) || root.length(transaction) < how_many {
                     let elements = (i..i + how_many).map(U64::from).collect::<Vec<U64>>();
                     root = root.enqueue_many(transaction, &elements);
                     i += how_many;
                 } else {
                     let res;
-                    (root, res) = root.dequeue(transaction).unwrap();
-                    assert_eq!(res.get(), j);
+                    (root, res) = root.dequeue_many(transaction, how_many).unwrap();
+                    for x in res {
+                        assert_eq!(x.get(), j);
                         j += 1;
                     }
                 }
+            }
 
             root
         });