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diff --git a/tests/test-iswdigit.c b/tests/test-iswdigit.c
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+/* Test of iswdigit() function.
+ Copyright (C) 2020-2022 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/>. */
+
+#include <config.h>
+
+#include <wctype.h>
+
+#include "signature.h"
+SIGNATURE_CHECK (iswdigit, int, (wint_t));
+
+#include <locale.h>
+#include <stdlib.h>
+#include <string.h>
+#include <wchar.h>
+
+#include "macros.h"
+
+/* Returns the value of iswdigit for the multibyte character s[0..n-1]. */
+static int
+for_character (const char *s, size_t n)
+{
+ mbstate_t state;
+ wchar_t wc;
+ size_t ret;
+
+ memset (&state, '\0', sizeof (mbstate_t));
+ wc = (wchar_t) 0xBADFACE;
+ ret = mbrtowc (&wc, s, n, &state);
+ if (ret == n)
+ return iswdigit (wc);
+ else
+ return 0;
+}
+
+int
+main (int argc, char *argv[])
+{
+ int is;
+ char buf[4];
+
+ /* configure should already have checked that the locale is supported. */
+ if (setlocale (LC_ALL, "") == NULL)
+ return 1;
+
+ /* Test WEOF. */
+ is = iswdigit (WEOF);
+ ASSERT (is == 0);
+
+ /* Test single-byte characters.
+ ISO C 99 sections 7.25.2.1.5 and 5.2.1 specify that the decimal digits
+ include only the ASCII 0 ... 9 characters. */
+ {
+ int c;
+
+ for (c = 0; c < 0x100; c++)
+ switch (c)
+ {
+ case '\t': case '\v': case '\f':
+ case ' ': case '!': case '"': case '#': case '%':
+ case '&': case '\'': case '(': case ')': case '*':
+ case '+': case ',': case '-': case '.': case '/':
+ case '0': case '1': case '2': case '3': case '4':
+ case '5': case '6': case '7': case '8': case '9':
+ case ':': case ';': case '<': case '=': case '>':
+ case '?':
+ case 'A': case 'B': case 'C': case 'D': case 'E':
+ case 'F': case 'G': case 'H': case 'I': case 'J':
+ case 'K': case 'L': case 'M': case 'N': case 'O':
+ case 'P': case 'Q': case 'R': case 'S': case 'T':
+ case 'U': case 'V': case 'W': case 'X': case 'Y':
+ case 'Z':
+ case '[': case '\\': case ']': case '^': case '_':
+ case 'a': case 'b': case 'c': case 'd': case 'e':
+ case 'f': case 'g': case 'h': case 'i': case 'j':
+ case 'k': case 'l': case 'm': case 'n': case 'o':
+ case 'p': case 'q': case 'r': case 's': case 't':
+ case 'u': case 'v': case 'w': case 'x': case 'y':
+ case 'z': case '{': case '|': case '}': case '~':
+ /* c is in the ISO C "basic character set". */
+ buf[0] = (unsigned char) c;
+ is = for_character (buf, 1);
+ switch (c)
+ {
+ case '0': case '1': case '2': case '3': case '4':
+ case '5': case '6': case '7': case '8': case '9':
+ ASSERT (is != 0);
+ break;
+ default:
+ ASSERT (is == 0);
+ break;
+ }
+ break;
+ }
+ }
+
+ if (argc > 1)
+ switch (argv[1][0])
+ {
+ case '0':
+ /* C locale; tested above. */
+ return 0;
+
+ case '1':
+ /* Locale encoding is ISO-8859-1 or ISO-8859-15. */
+ {
+ /* U+00B2 SUPERSCRIPT TWO */
+ is = for_character ("\262", 1);
+ ASSERT (is == 0);
+ /* U+00B3 SUPERSCRIPT THREE */
+ is = for_character ("\263", 1);
+ ASSERT (is == 0);
+ /* U+00B9 SUPERSCRIPT ONE */
+ is = for_character ("\271", 1);
+ ASSERT (is == 0);
+ }
+ return 0;
+
+ case '2':
+ /* Locale encoding is EUC-JP. */
+ {
+ /* U+FF11 FULLWIDTH DIGIT ONE */
+ is = for_character ("\243\261", 2);
+ ASSERT (is == 0);
+ }
+ return 0;
+
+ case '3':
+ /* Locale encoding is UTF-8. */
+ {
+ /* U+00B2 SUPERSCRIPT TWO */
+ is = for_character ("\302\262", 2);
+ ASSERT (is == 0);
+ /* U+00B3 SUPERSCRIPT THREE */
+ is = for_character ("\302\263", 2);
+ ASSERT (is == 0);
+ /* U+00B9 SUPERSCRIPT ONE */
+ is = for_character ("\302\271", 2);
+ ASSERT (is == 0);
+ /* U+0663 ARABIC-INDIC DIGIT THREE */
+ is = for_character ("\331\243", 2);
+ ASSERT (is == 0);
+ /* U+2070 SUPERSCRIPT ZERO */
+ is = for_character ("\342\201\260", 3);
+ ASSERT (is == 0);
+ /* U+2079 SUPERSCRIPT NINE */
+ is = for_character ("\342\201\271", 3);
+ ASSERT (is == 0);
+ /* U+FF11 FULLWIDTH DIGIT ONE */
+ is = for_character ("\357\274\221", 3);
+ ASSERT (is == 0);
+ /* U+1D7D1 MATHEMATICAL BOLD DIGIT THREE */
+ is = for_character ("\360\235\237\221", 4);
+ ASSERT (is == 0);
+ /* U+1D7DB MATHEMATICAL DOUBLE-STRUCK DIGIT THREE */
+ is = for_character ("\360\235\237\233", 4);
+ ASSERT (is == 0);
+ /* U+1D7E5 MATHEMATICAL SANS-SERIF DIGIT THREE */
+ is = for_character ("\360\235\237\245", 4);
+ ASSERT (is == 0);
+ /* U+1D7EF MATHEMATICAL SANS-SERIF BOLD DIGIT THREE */
+ is = for_character ("\360\235\237\257", 4);
+ ASSERT (is == 0);
+ /* U+1D7F9 MATHEMATICAL MONOSPACE DIGIT THREE */
+ is = for_character ("\360\235\237\271", 4);
+ ASSERT (is == 0);
+ /* U+E0033 TAG DIGIT THREE */
+ is = for_character ("\363\240\200\263", 4);
+ ASSERT (is == 0);
+ }
+ return 0;
+
+ case '4':
+ /* Locale encoding is GB18030. */
+ {
+ /* U+00B2 SUPERSCRIPT TWO */
+ is = for_character ("\201\060\205\065", 4);
+ ASSERT (is == 0);
+ /* U+00B3 SUPERSCRIPT THREE */
+ is = for_character ("\201\060\205\066", 4);
+ ASSERT (is == 0);
+ /* U+00B9 SUPERSCRIPT ONE */
+ is = for_character ("\201\060\206\061", 4);
+ ASSERT (is == 0);
+ /* U+0663 ARABIC-INDIC DIGIT THREE */
+ is = for_character ("\201\061\211\071", 4);
+ ASSERT (is == 0);
+ /* U+2070 SUPERSCRIPT ZERO */
+ is = for_character ("\201\066\255\062", 4);
+ ASSERT (is == 0);
+ /* U+2079 SUPERSCRIPT NINE */
+ is = for_character ("\201\066\256\061", 4);
+ ASSERT (is == 0);
+ /* U+FF11 FULLWIDTH DIGIT ONE */
+ is = for_character ("\243\261", 2);
+ ASSERT (is == 0);
+ /* U+1D7D1 MATHEMATICAL BOLD DIGIT THREE */
+ is = for_character ("\224\063\353\071", 4);
+ ASSERT (is == 0);
+ /* U+1D7DB MATHEMATICAL DOUBLE-STRUCK DIGIT THREE */
+ is = for_character ("\224\063\354\071", 4);
+ ASSERT (is == 0);
+ /* U+1D7E5 MATHEMATICAL SANS-SERIF DIGIT THREE */
+ is = for_character ("\224\063\355\071", 4);
+ ASSERT (is == 0);
+ /* U+1D7EF MATHEMATICAL SANS-SERIF BOLD DIGIT THREE */
+ is = for_character ("\224\063\356\071", 4);
+ ASSERT (is == 0);
+ /* U+1D7F9 MATHEMATICAL MONOSPACE DIGIT THREE */
+ is = for_character ("\224\063\357\071", 4);
+ ASSERT (is == 0);
+ /* U+E0033 TAG DIGIT THREE */
+ is = for_character ("\323\066\232\071", 4);
+ ASSERT (is == 0);
+ }
+ return 0;
+
+ }
+
+ return 1;
+}