diff --git a/src/tests/example_sets/benches/main.rs b/src/tests/example_sets/benches/main.rs
--- a/src/tests/example_sets/benches/main.rs
+++ b/src/tests/example_sets/benches/main.rs
@@ -1,7 +1,7 @@
 use criterion::{criterion_group, criterion_main, BenchmarkId, Criterion};
 
 fn run_benches(c: &mut Criterion) {
-    for size in [500, 10_000, 50_000].iter() {
+    for size in [500, 2_000, 10_000, 50_000].iter() {
         c.bench_with_input(
             BenchmarkId::new("example_sets-insert_n", size),
             size,
diff --git a/src/tests/example_sets/src/lib.rs b/src/tests/example_sets/src/lib.rs
--- a/src/tests/example_sets/src/lib.rs
+++ b/src/tests/example_sets/src/lib.rs
@@ -14,7 +14,7 @@ for _ in 0..n {
         set.insert(random());
     }
 
-    for i in 0..2 * n {
-        black_box(|x| x)(black_box(set.contains(&i)));
+    for _ in 0..2 * n {
+        black_box(|x| x)(black_box(set.contains(&random())));
     }
 }