From 9673079903306d0408ed66359f15c49ec2d53907 Mon Sep 17 00:00:00 2001
From: Alexandre Daubois <2144837+alexandre-daubois@users.noreply.github.com>
Date: Fri, 8 Aug 2025 19:16:32 +0200
Subject: [PATCH] Fix GH-18404: Display diff when a single test is run
 (GH-19400)

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

diff --git a/run-tests.php b/run-tests.php
index 03616272567..6c31c1d0187 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);