--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,9 @@
 2010-01-10  Bruno Haible  <bruno@clisp.org>
 
+	Tests for module 'unistr/u32-strncmp'.
+	* modules/unistr/u32-strncmp-tests: New file.
+	* tests/unistr/test-u32-strncmp.c: New file.
+
 	Tests for module 'unistr/u16-strncmp'.
 	* modules/unistr/u16-strncmp-tests: New file.
 	* tests/unistr/test-u16-strncmp.c: New file.

new file mode 100644
--- /dev/null
+++ b/modules/unistr/u32-strncmp-tests
@@ -0,0 +1,13 @@
+Files:
+tests/unistr/test-u32-strncmp.c
+tests/unistr/test-strncmp.h
+tests/macros.h
+
+Depends-on:
+
+configure.ac:
+
+Makefile.am:
+TESTS += test-u32-strncmp
+check_PROGRAMS += test-u32-strncmp
+test_u32_strncmp_SOURCES = unistr/test-u32-strncmp.c

new file mode 100644
--- /dev/null
+++ b/tests/unistr/test-u32-strncmp.c
@@ -0,0 +1,47 @@
+/* Test of u32_strncmp() 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"
+
+#define UNIT uint32_t
+#define U_STRNCMP u32_strncmp
+#include "test-strncmp.h"
+
+int
+main ()
+{
+  test_strncmp ();
+
+  /* Test comparison with non-BMP characters.  */
+  {
+    static const UNIT input1[] = { 0x1D51F, 0 };
+    static const UNIT input2[] = { 0xFEFF, 0 };
+    ASSERT (U_STRNCMP (input1, input2, 1) > 0);
+    ASSERT (U_STRNCMP (input2, input1, 1) < 0);
+    ASSERT (U_STRNCMP (input1, input2, 2) > 0);
+    ASSERT (U_STRNCMP (input2, input1, 2) < 0);
+    ASSERT (U_STRNCMP (input1, input2, 1000000) > 0);
+    ASSERT (U_STRNCMP (input2, input1, 1000000) < 0);
+  }
+
+  return 0;
+}