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diff --git a/tests/unistr/test-u16-mbsnlen.c b/tests/unistr/test-u16-mbsnlen.c
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+/* Test of u16_mbsnlen() function.
+ Copyright (C) 2010 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 <http://www.gnu.org/licenses/>. */
+
+/* Written by Bruno Haible <bruno@clisp.org>, 2010. */
+
+#include <config.h>
+
+#include "unistr.h"
+
+#include "macros.h"
+
+int
+main ()
+{
+ /* Simple string. */
+ { /* "Grüß Gott. Здравствуйте! x=(-b±sqrt(b²-4ac))/(2a) 日本語,中文,한글" */
+ static const uint16_t input[] =
+ { 'G', 'r', 0x00FC, 0x00DF, ' ', 'G', 'o', 't', 't', '.', ' ',
+ 0x0417, 0x0434, 0x0440, 0x0430, 0x0432, 0x0441, 0x0442, 0x0432, 0x0443,
+ 0x0439, 0x0442, 0x0435, '!', ' ',
+ 'x', '=', '(', '-', 'b', 0x00B1, 's', 'q', 'r', 't', '(', 'b', 0x00B2,
+ '-', '4', 'a', 'c', ')', ')', '/', '(', '2', 'a', ')', ' ', ' ',
+ 0x65E5, 0x672C, 0x8A9E, ',', 0x4E2D, 0x6587, ',', 0xD55C, 0xAE00, '\n'
+ };
+ size_t n;
+
+ for (n = 0; n <= SIZEOF (input); n++)
+ {
+ size_t len = u16_mbsnlen (input, n);
+ ASSERT (len == n);
+ }
+ }
+
+ /* String with characters outside the BMP. */
+ {
+ static const uint16_t input[] =
+ { '-', '(', 0xD835, 0xDD1E, 0x00D7, 0xD835, 0xDD1F, ')', '=',
+ 0xD835, 0xDD1F, 0x00D7, 0xD835, 0xDD1E
+ };
+ static const size_t expected[SIZEOF (input) + 1] =
+ { 0,
+ 1, 2, 3, 3, 4, 5, 5, 6, 7,
+ 8, 8, 9, 10, 10
+ };
+ size_t n;
+
+ for (n = 0; n <= SIZEOF (input); n++)
+ {
+ size_t len = u16_mbsnlen (input, n);
+ ASSERT (len == expected[n]);
+ }
+ }
+
+ return 0;
+}