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diff --git a/gnulib-tests/test-mbsstr3.c b/gnulib-tests/test-mbsstr3.c
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+++ b/gnulib-tests/test-mbsstr3.c
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+/* Test of searching in a string.
+   Copyright (C) 2007-2018 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/>.  */
+
+/* Written by Bruno Haible <bruno@clisp.org>, 2007.  */
+
+#include <config.h>
+
+#include <string.h>
+
+#include <locale.h>
+
+#include "macros.h"
+
+int
+main ()
+{
+  /* configure should already have checked that the locale is supported.  */
+  if (setlocale (LC_ALL, "") == NULL)
+    return 1;
+
+  /* Tests with a character < 0x30.  */
+  {
+    const char input[] = "\312\276\300\375 \312\276\300\375 \312\276\300\375"; /* "示例 示例 示例" */
+    const char *result = mbsstr (input, " ");
+    ASSERT (result == input + 4);
+  }
+
+  {
+    const char input[] = "\312\276\300\375"; /* "示例" */
+    const char *result = mbsstr (input, " ");
+    ASSERT (result == NULL);
+  }
+
+  /* Tests with a character >= 0x30.  */
+  {
+    const char input[] = "\272\305123\324\313\320\320\241\243"; /* "号123运行。" */
+    const char *result = mbsstr (input, "2");
+    ASSERT (result == input + 3);
+  }
+
+  /* The following tests show how mbsstr() is different from strstr().  */
+
+  {
+    const char input[] = "\313\320\320\320"; /* "诵行" */
+    const char *result = mbsstr (input, "\320\320"); /* "行" */
+    ASSERT (result == input + 2);
+  }
+
+  {
+    const char input[] = "\203\062\332\066123\324\313\320\320\241\243"; /* "씋123运行。" */
+    const char *result = mbsstr (input, "2");
+    ASSERT (result == input + 5);
+  }
+
+  {
+    const char input[] = "\312\276\300\375 \312\276\300\375 \312\276\300\375"; /* "示例 示例 示例" */
+    const char *result = mbsstr (input, "\276\300"); /* "纠" */
+    ASSERT (result == NULL);
+  }
+
+  {
+    const char input[] = "\312\276\300\375 \312\276\300\375 \312\276\300\375"; /* "示例 示例 示例" */
+    const char *result = mbsstr (input, "\375 "); /* invalid multibyte sequence */
+    ASSERT (result == NULL);
+  }
+
+  return 0;
+}