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diff --git a/tests/unistr/test-u16-mbtoucr.c b/tests/unistr/test-u16-mbtoucr.c
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+/* Test of u16_mbtoucr() 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 ()
+{
+ ucs4_t uc;
+ int ret;
+
+ /* Test NUL unit input. */
+ {
+ static const uint16_t input[] = { 0 };
+ uc = 0xBADFACE;
+ ret = u16_mbtoucr (&uc, input, 1);
+ ASSERT (ret == 1);
+ ASSERT (uc == 0);
+ }
+
+ /* Test ISO 646 unit input. */
+ {
+ ucs4_t c;
+ uint16_t buf[1];
+
+ for (c = 0; c < 0x80; c++)
+ {
+ buf[0] = c;
+ uc = 0xBADFACE;
+ ret = u16_mbtoucr (&uc, buf, 1);
+ ASSERT (ret == 1);
+ ASSERT (uc == c);
+ }
+ }
+
+ /* Test BMP unit input. */
+ {
+ static const uint16_t input[] = { 0x20AC };
+ uc = 0xBADFACE;
+ ret = u16_mbtoucr (&uc, input, 1);
+ ASSERT (ret == 1);
+ ASSERT (uc == 0x20AC);
+ }
+
+ /* Test 2-units character input. */
+ {
+ static const uint16_t input[] = { 0xD835, 0xDD1F };
+ uc = 0xBADFACE;
+ ret = u16_mbtoucr (&uc, input, 2);
+ ASSERT (ret == 2);
+ ASSERT (uc == 0x1D51F);
+ }
+
+ /* Test incomplete/invalid 1-unit input. */
+ {
+ static const uint16_t input[] = { 0xD835 };
+ uc = 0xBADFACE;
+ ret = u16_mbtoucr (&uc, input, 1);
+ ASSERT (ret == -2);
+ ASSERT (uc == 0xFFFD);
+ }
+ {
+ static const uint16_t input[] = { 0xDD1F };
+ uc = 0xBADFACE;
+ ret = u16_mbtoucr (&uc, input, 1);
+ ASSERT (ret == -1);
+ ASSERT (uc == 0xFFFD);
+ }
+
+ return 0;
+}