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diff --git a/gnulib-tests/test-c-strncasecmp.c b/gnulib-tests/test-c-strncasecmp.c
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+++ b/gnulib-tests/test-c-strncasecmp.c
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+/* Test of case-insensitive string comparison function.
+   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 "c-strcase.h"
+#include "c-ctype.h"
+
+#include <locale.h>
+#include <string.h>
+
+#include "macros.h"
+
+int
+main (int argc, char *argv[])
+{
+  if (argc > 1)
+    {
+      /* configure should already have checked that the locale is supported.  */
+      if (setlocale (LC_ALL, "") == NULL)
+        return 1;
+    }
+
+  ASSERT (c_strncasecmp ("paragraph", "Paragraph", 1000000) == 0);
+  ASSERT (c_strncasecmp ("paragraph", "Paragraph", 9) == 0);
+
+  ASSERT (c_strncasecmp ("paragrapH", "parAgRaph", 1000000) == 0);
+  ASSERT (c_strncasecmp ("paragrapH", "parAgRaph", 9) == 0);
+
+  ASSERT (c_strncasecmp ("paragraph", "paraLyzed", 10) < 0);
+  ASSERT (c_strncasecmp ("paragraph", "paraLyzed", 9) < 0);
+  ASSERT (c_strncasecmp ("paragraph", "paraLyzed", 5) < 0);
+  ASSERT (c_strncasecmp ("paragraph", "paraLyzed", 4) == 0);
+  ASSERT (c_strncasecmp ("paraLyzed", "paragraph", 10) > 0);
+  ASSERT (c_strncasecmp ("paraLyzed", "paragraph", 9) > 0);
+  ASSERT (c_strncasecmp ("paraLyzed", "paragraph", 5) > 0);
+  ASSERT (c_strncasecmp ("paraLyzed", "paragraph", 4) == 0);
+
+  ASSERT (c_strncasecmp ("para", "paragraph", 10) < 0);
+  ASSERT (c_strncasecmp ("para", "paragraph", 9) < 0);
+  ASSERT (c_strncasecmp ("para", "paragraph", 5) < 0);
+  ASSERT (c_strncasecmp ("para", "paragraph", 4) == 0);
+  ASSERT (c_strncasecmp ("paragraph", "para", 10) > 0);
+  ASSERT (c_strncasecmp ("paragraph", "para", 9) > 0);
+  ASSERT (c_strncasecmp ("paragraph", "para", 5) > 0);
+  ASSERT (c_strncasecmp ("paragraph", "para", 4) == 0);
+
+  /* The following tests shows how c_strncasecmp() is different from
+     strncasecmp().  */
+
+  ASSERT (c_strncasecmp ("\311mily", "\351mile", 4) < 0);
+  ASSERT (c_strncasecmp ("\351mile", "\311mily", 4) > 0);
+
+  /* The following tests shows how c_strncasecmp() is different from
+     mbsncasecmp().  */
+
+  ASSERT (c_strncasecmp ("\303\266zg\303\274r", "\303\226ZG\303\234R", 99) > 0); /* özgür */
+  ASSERT (c_strncasecmp ("\303\226ZG\303\234R", "\303\266zg\303\274r", 99) < 0); /* özgür */
+
+#if C_CTYPE_ASCII
+  /* This test shows how strings of different size cannot compare equal.  */
+  ASSERT (c_strncasecmp ("turkish", "TURK\304\260SH", 7) < 0);
+  ASSERT (c_strncasecmp ("TURK\304\260SH", "turkish", 7) > 0);
+#endif
+
+  return 0;
+}