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diff --git a/tests/unicase/test-is-cased.h b/tests/unicase/test-is-cased.h
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+++ b/tests/unicase/test-is-cased.h
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+/* Test of test whether case matters for a Unicode string.
+   Copyright (C) 2009 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>, 2009.  */
+
+static void
+test_ascii (int (*my_is) (const UNIT *, size_t, const char *, bool *))
+{
+  /* Test cases from Unicode 5.0, chapter 3.  */
+  {
+    static const UNIT input[] = { 'A', 'B', 'C' };
+    bool result;
+
+    ASSERT (my_is (input, SIZEOF (input), NULL, &result) == 0);
+    ASSERT (result == true);
+  }
+  {
+    static const UNIT input[] = { 'a', 'b', 'c' };
+    bool result;
+
+    ASSERT (my_is (input, SIZEOF (input), NULL, &result) == 0);
+    ASSERT (result == true);
+  }
+  {
+    static const UNIT input[] = { 'a', 'B', 'c' };
+    bool result;
+
+    ASSERT (my_is (input, SIZEOF (input), NULL, &result) == 0);
+    ASSERT (result == true);
+  }
+  {
+    static const UNIT input[] = { 'a', 'B', 'c', '1', '2', '3' };
+    bool result;
+
+    ASSERT (my_is (input, SIZEOF (input), NULL, &result) == 0);
+    ASSERT (result == true);
+  }
+  {
+    static const UNIT input[] = { '1', '2', '3' };
+    bool result;
+
+    ASSERT (my_is (input, SIZEOF (input), NULL, &result) == 0);
+    ASSERT (result == false);
+  }
+}