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diff --git a/tests/unigbrk/test-u8-grapheme-prev.c b/tests/unigbrk/test-u8-grapheme-prev.c
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+/* Previous grapheme cluster test.
+ Copyright (C) 2010-2015 Free Software Foundation, Inc.
+
+ This program is free software: you can redistribute it and/or modify it
+ under the terms of the GNU Lesser 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
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
+
+/* Written by Ben Pfaff <blp@cs.stanford.edu>, 2010. */
+
+#include <config.h>
+
+/* Specification. */
+#include <unigbrk.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "macros.h"
+
+static void
+test_u8_grapheme_prev (const char *input, size_t n, size_t len)
+{
+ const uint8_t *s = (const uint8_t *) input;
+ const uint8_t *end = s + n;
+ const uint8_t *prev = u8_grapheme_prev (end, s);
+ if (prev != end - len)
+ {
+ size_t i;
+
+ if (prev == NULL)
+ fputs ("u8_grapheme_prev returned NULL", stderr);
+ else
+ fprintf (stderr, "u8_grapheme_prev skipped %zu bytes", end - prev);
+ fprintf (stderr, ", expected %zu:\n", len);
+ for (i = 0; i < n; i++)
+ fprintf (stderr, " %02x", s[i]);
+ putc ('\n', stderr);
+ abort ();
+ }
+}
+
+int
+main (void)
+{
+ static const uint8_t s[] = "abc";
+
+ /* Empty string. */
+ ASSERT (u8_grapheme_prev (NULL, NULL) == NULL);
+ ASSERT (u8_grapheme_prev (s, s) == NULL);
+
+ /* Standalone 1-unit graphemes. */
+ test_u8_grapheme_prev ("a", 1, 1);
+ test_u8_grapheme_prev ("ab", 2, 1);
+ test_u8_grapheme_prev ("abc", 3, 1);
+
+ /* Multi-unit, single code point graphemes. */
+#define HIRAGANA_A "\343\201\202" /* あ: Hiragana letter 'a'. */
+ test_u8_grapheme_prev (HIRAGANA_A, 3, 3);
+ test_u8_grapheme_prev (HIRAGANA_A"x", 4, 1);
+ test_u8_grapheme_prev (HIRAGANA_A HIRAGANA_A, 6, 3);
+
+ /* Combining accents. */
+#define GRAVE "\314\200" /* Combining grave accent. */
+#define ACUTE "\314\201" /* Combining acute accent. */
+ test_u8_grapheme_prev ("e"ACUTE, 3, 3);
+ test_u8_grapheme_prev ("e"ACUTE GRAVE, 5, 5);
+ test_u8_grapheme_prev ("e"ACUTE"x", 4, 1);
+ test_u8_grapheme_prev ("e"ACUTE "e"ACUTE, 6, 3);
+
+ return 0;
+}