From 0dfacb53812098da4f5258e04401c296e14aa5d1 Mon Sep 17 00:00:00 2001
From: Alexandre Daubois <alex.daubois@gmail.com>
Date: Fri, 8 Aug 2025 10:08:43 +0200
Subject: [PATCH] Fix GH-18404: Display diff when a single test is run

---
 run-tests.php | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/run-tests.php b/run-tests.php
index 036162725673f..6c31c1d0187d9 100755
--- a/run-tests.php
+++ b/run-tests.php
@@ -688,6 +688,10 @@ function main(): void
     // Run selected tests.
     $test_cnt = count($test_files);
 
+    if ($test_cnt === 1) {
+        $cfg['show']['diff'] = true;
+    }
+
     verify_config($php);
     write_information($user_tests, $phpdbg);