From eb0f1d558ac91eedfa59d304610ca8f3b9172409 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Arpad=20M=C3=BCller?= <arpad@neon.tech>
Date: Fri, 9 Aug 2024 21:52:06 +0200
Subject: [PATCH] Make get_large_img generate random, badly compressible data

---
 pageserver/src/tenant/storage_layer/split_writer.rs | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/pageserver/src/tenant/storage_layer/split_writer.rs b/pageserver/src/tenant/storage_layer/split_writer.rs
index d7bfe48c60f6..e12e29cd457e 100644
--- a/pageserver/src/tenant/storage_layer/split_writer.rs
+++ b/pageserver/src/tenant/storage_layer/split_writer.rs
@@ -208,6 +208,8 @@ impl SplitDeltaLayerWriter {
 
 #[cfg(test)]
 mod tests {
+    use rand::{RngCore, SeedableRng};
+
     use crate::{
         tenant::{
             harness::{TenantHarness, TIMELINE_ID},
@@ -229,7 +231,10 @@ mod tests {
     }
 
     fn get_large_img() -> Bytes {
-        vec![0; 8192].into()
+        let mut rng = rand::rngs::SmallRng::seed_from_u64(42);
+        let mut data = vec![0; 8192];
+        rng.fill_bytes(&mut data);
+        data.into()
     }
 
     #[tokio::test]