From 08fe2611ab45d0af08232da1b8cbf06ec63a2e9d Mon Sep 17 00:00:00 2001
From: Alex Waygood <Alex.Waygood@Gmail.com>
Date: Fri, 28 Jul 2023 00:57:55 +0100
Subject: [PATCH] gh-106368: Argument clinic tests: improve failure message
 when tests in `ClinicExternalTests` fail (GH-107364) (cherry picked from
 commit 76c26eaca4147ba7e3e8d7379c5a828f0b512a46)

Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com>
---
 Lib/test/test_clinic.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Lib/test/test_clinic.py b/Lib/test/test_clinic.py
index 32c4b1e67f9574..1c01fb0ed36888 100644
--- a/Lib/test/test_clinic.py
+++ b/Lib/test/test_clinic.py
@@ -1306,7 +1306,7 @@ def _do_test(self, *args, expect_success=True):
         ) as proc:
             proc.wait()
             if expect_success and proc.returncode:
-                self.fail("".join(proc.stderr))
+                self.fail("".join([*proc.stdout, *proc.stderr]))
             stdout = proc.stdout.read()
             stderr = proc.stderr.read()
             # Clinic never writes to stderr.