diff --git a/hive-agent/src/stream_enrich.rs b/hive-agent/src/stream_enrich.rs
index 81724b38..866f2569 100644
--- a/hive-agent/src/stream_enrich.rs
+++ b/hive-agent/src/stream_enrich.rs
@@ -1249,7 +1249,7 @@ mod tests {
 
     #[test]
     fn a_long_tool_result_reports_its_line_count() {
-        let txt = (0..40).map(|i| format!("line {i}\n")).collect::<String>();
+        let txt = "line\n".repeat(40);
         let trimmed: String = txt.split_whitespace().collect::<Vec<_>>().join(" ");
         assert!(summarize_tool_result(&txt, &trimmed).starts_with("40L · "));
     }