diff --git a/fixtures/durable-review.ts b/fixtures/durable-review.ts
new file mode 100644
index 0000000..befba3b
--- /dev/null
+++ b/fixtures/durable-review.ts
@@ -0,0 +1,7 @@
+export function averageDuration(durations: number[]) {
+  if (durations.length === 0) {
+    return 0;
+  }
+  const total = durations.reduce((sum, duration) => sum + duration, 0);
+  return total / durations.length;
+}