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diff --git a/tests/unistdio/test-u16-asnprintf1.h b/tests/unistdio/test-u16-asnprintf1.h
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+/* Test of u16_[v]asnprintf() function.
+ Copyright (C) 2007 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>, 2007. */
+
+static void
+test_function (uint16_t * (*my_asnprintf) (uint16_t *, size_t *, const char *, ...))
+{
+ uint16_t buf[8];
+ int size;
+
+ /* Test return value convention. */
+
+ for (size = 0; size <= 8; size++)
+ {
+ size_t length = size;
+ uint16_t *result = my_asnprintf (NULL, &length, "%d", 12345);
+ static const uint16_t expected[] =
+ { '1', '2', '3', '4', '5', 0 };
+ ASSERT (result != NULL);
+ ASSERT (u16_strcmp (result, expected) == 0);
+ ASSERT (length == 5);
+ free (result);
+ }
+
+ for (size = 0; size <= 8; size++)
+ {
+ static const uint16_t initializer[] =
+ { 'D', 'E', 'A', 'D', 'B', 'E', 'E', 'F', 0 };
+ static const uint16_t expected[] =
+ { '1', '2', '3', '4', '5', 0 };
+ size_t length;
+ uint16_t *result;
+
+ u16_cpy (buf, initializer, 8);
+ length = size;
+ result = my_asnprintf (buf, &length, "%d", 12345);
+ ASSERT (result != NULL);
+ ASSERT (u16_strcmp (result, expected) == 0);
+ ASSERT (length == 5);
+ if (size < 6)
+ ASSERT (result != buf);
+ ASSERT (u16_cmp (buf + size, initializer + size, 8 - size) == 0);
+ if (result != buf)
+ free (result);
+ }
+}