[clang] [clang-tools-extra] [clang-format][clang-tools-extra] Fix leaking of host-level config into test environment (PR #206358)

[Damian Höster via cfe-commits]

https://github.com/damster101 updated https://github.com/llvm/llvm-project/pull/206358

>From adfcabc5d0d2dcb11bbaeee63ee85fa210d344ed Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Damian=20H=C3=B6ster?= <damian.hoester at posteo.de>
Date: Sun, 28 Jun 2026 18:22:54 +0200
Subject: [PATCH] [clang-format] Fix host-level config leaking into test
 environment

These leaks were causing false test failures due to my global .clang-format being in a parent directory of the build directory.
---
 .../clang-change-namespace/ChangeNamespaceTests.cpp         | 6 +++---
 clang/test/Format/dump-config-objc-stdin.m                  | 4 ++--
 2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/clang-tools-extra/unittests/clang-change-namespace/ChangeNamespaceTests.cpp b/clang-tools-extra/unittests/clang-change-namespace/ChangeNamespaceTests.cpp
index 4a6352cd5975e..6d1612e7d3b16 100644
--- a/clang-tools-extra/unittests/clang-change-namespace/ChangeNamespaceTests.cpp
+++ b/clang-tools-extra/unittests/clang-change-namespace/ChangeNamespaceTests.cpp
@@ -46,7 +46,7 @@ class ChangeNamespaceTest : public ::testing::Test {
     if (!tooling::runToolOnCodeWithArgs(Factory->create(), Code, {"-std=c++11"},
                                         FileName))
       return "";
-    formatAndApplyAllReplacements(FileToReplacements, Context.Rewrite);
+    formatAndApplyAllReplacements(FileToReplacements, Context.Rewrite, "llvm");
     return format(Context.getRewrittenText(ID));
   }
 
@@ -63,10 +63,10 @@ class ChangeNamespaceTest : public ::testing::Test {
   }
 
 protected:
-  std::string FileName = "input.cc";
+  std::string FileName = "/test/input.cc";
   std::string OldNamespace = "na::nb";
   std::string NewNamespace = "x::y";
-  std::string FilePattern = "input.cc";
+  std::string FilePattern = "/test/input.cc";
 };
 
 TEST_F(ChangeNamespaceTest, NoMatchingNamespace) {
diff --git a/clang/test/Format/dump-config-objc-stdin.m b/clang/test/Format/dump-config-objc-stdin.m
index d81711a84d79b..01a4a78a5a65d 100644
--- a/clang/test/Format/dump-config-objc-stdin.m
+++ b/clang/test/Format/dump-config-objc-stdin.m
@@ -1,6 +1,6 @@
-// RUN: clang-format -assume-filename=foo.m -dump-config | FileCheck %s
+// RUN: clang-format -style=llvm -assume-filename=foo.m -dump-config | FileCheck %s
 
-// RUN: clang-format -dump-config - < %s | FileCheck %s
+// RUN: clang-format -style=llvm -dump-config - < %s | FileCheck %s
 
 // CHECK: Language: ObjC