From 9a2ebd7f253dad9f66600ddefdd8870cf90d341a Mon Sep 17 00:00:00 2001
From: Brad King <brad.king@kitware.com>
Date: Tue, 3 Feb 2026 14:49:42 -0500
Subject: [PATCH] Tests: Add RunCMake.string case covering TOLOWER and TOUPPER
 with UTF-8

---
 Tests/RunCMake/string/CaseUTF-8.cmake    | 11 +++++++++++
 Tests/RunCMake/string/RunCMakeTest.cmake |  2 ++
 2 files changed, 13 insertions(+)
 create mode 100644 Tests/RunCMake/string/CaseUTF-8.cmake

diff --git a/Tests/RunCMake/string/CaseUTF-8.cmake b/Tests/RunCMake/string/CaseUTF-8.cmake
new file mode 100644
index 0000000000..f44e47cb21
--- /dev/null
+++ b/Tests/RunCMake/string/CaseUTF-8.cmake
@@ -0,0 +1,11 @@
+#                 Chinese Hindi  Greek English Russian
+set(string_mixed "注意    यूनिकोड είναι VeRy    здорово!") # UTF-8
+set(string_upper "注意    यूनिकोड είναι VERY    здорово!") # UTF-8
+set(string_lower "注意    यूनिकोड είναι very    здорово!") # UTF-8
+string(TOLOWER "${string_mixed}" output_lower)
+string(TOUPPER "${string_mixed}" output_upper)
+foreach(case lower upper)
+  if(NOT "${output_${case}}" STREQUAL "${string_${case}}")
+    message(SEND_ERROR "to${case} failed:\n  \"${output_${case}}\"")
+  endif()
+endforeach()
diff --git a/Tests/RunCMake/string/RunCMakeTest.cmake b/Tests/RunCMake/string/RunCMakeTest.cmake
index f4a6ff8487..3da258ea50 100644
--- a/Tests/RunCMake/string/RunCMakeTest.cmake
+++ b/Tests/RunCMake/string/RunCMakeTest.cmake
@@ -14,6 +14,8 @@ run_cmake(AppendNoArgs)
 run_cmake(Prepend)
 run_cmake(PrependNoArgs)
 
+run_cmake_script(CaseUTF-8)
+
 run_cmake(Concat)
 run_cmake(ConcatNoArgs)