--- /dev/null
+/* Test of wide character mappings.
+ Copyright (C) 2023 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/>. */
+
+/* Written by Bruno Haible <bruno@clisp.org>, 2023. */
+
+#include <config.h>
+
+#include <wctype.h>
+
+#include "signature.h"
+SIGNATURE_CHECK (towctrans, wint_t, (wint_t, wctrans_t));
+
+#include "macros.h"
+
+int
+main (int argc, char *argv[])
+{
+ wctrans_t desc;
+
+ desc = wctrans ("any");
+ ASSERT (desc == (wctrans_t) 0);
+
+ desc = wctrans ("tolower");
+ ASSERT (desc != (wctrans_t) 0);
+ ASSERT (towctrans (L'a', desc) == 'a');
+ ASSERT (towctrans (L'z', desc) == 'z');
+ ASSERT (towctrans (L'A', desc) == 'a');
+ ASSERT (towctrans (L'Z', desc) == 'z');
+ ASSERT (towctrans (L'1', desc) == '1');
+ ASSERT (towctrans (L'_', desc) == '_');
+ ASSERT (towctrans (L'_', desc) == '_');
+ ASSERT (towctrans ((wchar_t) 0, desc) == 0);
+ ASSERT (towctrans (WEOF, desc) == WEOF);
+
+ desc = wctrans ("toupper");
+ ASSERT (desc != (wctrans_t) 0);
+ ASSERT (towctrans (L'A', desc) == 'A');
+ ASSERT (towctrans (L'Z', desc) == 'Z');
+ ASSERT (towctrans (L'a', desc) == 'A');
+ ASSERT (towctrans (L'z', desc) == 'Z');
+ ASSERT (towctrans (L'1', desc) == '1');
+ ASSERT (towctrans (L'_', desc) == '_');
+ ASSERT (towctrans ((wchar_t) 0, desc) == 0);
+ ASSERT (towctrans (WEOF, desc) == WEOF);
+
+ return 0;
+}