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diff --git a/tests/unistr/test-cmp.h b/tests/unistr/test-cmp.h
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+/* Test of uN_cmp() functions.
+   Copyright (C) 2008-2010 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 Simon Josefsson and Bruno Haible <bruno@clisp.org>, 2010.  */
+
+static void
+test_cmp (void)
+{
+  /* Test equal / not equal distinction.  */
+  ASSERT (U_CMP (zerosize_ptr (), zerosize_ptr (), 0) == 0);
+  {
+    static const UNIT input1[] = { 'f', 'o', 'o', 0 };
+    static const UNIT input2[] = { 'f', 'o', 'o', 'b', 'a', 'r', 0 };
+    ASSERT (U_CMP (input1, input2, 2) == 0);
+    ASSERT (U_CMP (input1, input2, 3) == 0);
+    ASSERT (U_CMP (input1, input2, 4) != 0);
+  }
+  {
+    static const UNIT input1[] = { 'f', 'o', 'o', 0 };
+    static const UNIT input2[] = { 'b', 'a', 'r', 0 };
+    ASSERT (U_CMP (input1, input2, 1) != 0);
+    ASSERT (U_CMP (input1, input2, 3) != 0);
+  }
+
+  /* Test less / equal / greater distinction.  */
+  {
+    static const UNIT input1[] = { 'f', 'o', 'o', 0 };
+    static const UNIT input2[] = { 'm', 'o', 'o', 0 };
+    ASSERT (U_CMP (input1, input2, 4) < 0);
+    ASSERT (U_CMP (input2, input1, 4) > 0);
+  }
+  {
+    static const UNIT input1[] = { 'o', 'o', 'm', 'p', 'h', 0 };
+    static const UNIT input2[] = { 'o', 'o', 'p', 's', 0 };
+    ASSERT (U_CMP (input1, input2, 3) < 0);
+    ASSERT (U_CMP (input2, input1, 3) > 0);
+  }
+  {
+    static const UNIT input1[] = { 'f', 'o', 'o', 0 };
+    static const UNIT input2[] = { 'f', 'o', 'o', 'b', 'a', 'r', 0 };
+    ASSERT (U_CMP (input1, input2, 4) < 0);
+    ASSERT (U_CMP (input2, input1, 4) > 0);
+  }
+
+  /* Some old versions of memcmp were not 8-bit clean.  */
+  {
+    static const UNIT input1[] = { 0x40 };
+    static const UNIT input2[] = { 0xC2 };
+    ASSERT (U_CMP (input1, input2, 1) < 0);
+    ASSERT (U_CMP (input2, input1, 1) > 0);
+  }
+  {
+    static const UNIT input1[] = { 0xC2 };
+    static const UNIT input2[] = { 0xC3 };
+    ASSERT (U_CMP (input1, input2, 1) < 0);
+    ASSERT (U_CMP (input2, input1, 1) > 0);
+  }
+
+  /* The Next x86 OpenStep bug shows up only when comparing 16 bytes
+     or more and with at least one buffer not starting on a 4-byte boundary.
+     William Lewis provided this test program.   */
+  {
+    UNIT foo[21];
+    UNIT bar[21];
+    int i;
+    for (i = 0; i < 4; i++)
+      {
+        UNIT *a = foo + i;
+        UNIT *b = bar + i;
+        int j;
+        for (j = 0; j < 8; j++)
+          a[j] = '-';
+        a[8] = '0';
+        for (j = 9; j < 16; j++)
+          a[j] = '1';
+        for (j = 0; j < 8; j++)
+          b[j] = '-';
+        b[8] = '1';
+        for (j = 9; j < 16; j++)
+          b[j] = '0';
+        ASSERT (U_CMP (a, b, 16) < 0);
+      }
+  }
+}