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diff --git a/tests/test-localcharset.c b/tests/test-localcharset.c
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+/* Manual test of localcharset() function.
+ Copyright (C) 2018-2022 Free Software Foundation, Inc.
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <https://www.gnu.org/licenses/>. */
+
+/* This program prints the result of locale_charset in the current locale.
+ One way to use it is:
+ $ for l in `locale -a`; do
+ echo -n "$l "; LANG=$l ./test-localcharset;
+ done \
+ | sort -k 2
+ */
+
+#include <config.h>
+
+#include "localcharset.h"
+
+#include <locale.h>
+#include <stdio.h>
+
+int
+main (void)
+{
+ setlocale (LC_ALL, "");
+ printf ("%s\n", locale_charset ());
+
+ return 0;
+}