From aca209c0956dae1eb3695c702a12a3570c640886 Mon Sep 17 00:00:00 2001
From: Matthias Koefferlein <matthias@koefferlein.de>
Date: Wed, 18 Jul 2018 21:57:47 +0200
Subject: [PATCH] Using C.UTF-8 locale fallback for string tests for vanilla
 Linux installations.

---
 src/tl/unit_tests/tlString.cc | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/tl/unit_tests/tlString.cc b/src/tl/unit_tests/tlString.cc
index 93c254a04..13e2f064b 100644
--- a/src/tl/unit_tests/tlString.cc
+++ b/src/tl/unit_tests/tlString.cc
@@ -484,9 +484,13 @@ TEST(14)
 //  UTF-8 to wchar_t and local conversion
 TEST(15)
 {
-  //  NOTE: we don't know the local setting, but translation back and forth should work.
   std::string locale = setlocale (LC_ALL, NULL);
-  setlocale (LC_ALL, "en_US.UTF-8");
+  const char *lc = setlocale (LC_ALL, "en_US.UTF-8");
+  if (! lc || std::string (lc) != "en_US.UTF-8") {
+    //  use C.UTF-8 as fallback
+    setlocale (LC_ALL, "C.UTF-8");
+  }
+
   try {
     EXPECT_EQ (tl::to_string_from_local (tl::to_local ("Hällo\tWörld!").c_str ()), "Hällo\tWörld!");
     setlocale (LC_ALL, locale.c_str ());