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diff --git a/libstdc++-v3/testsuite/21_strings/basic_string/capacity/char/18654.cc b/libstdc++-v3/testsuite/21_strings/basic_string/capacity/char/18654.cc
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+++ b/libstdc++-v3/testsuite/21_strings/basic_string/capacity/char/18654.cc
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+// 2004-11-29  Paolo Carlini  <pcarlini@suse.de>
+
+// Copyright (C) 2004, 2009 Free Software Foundation
+//
+// This file is part of the GNU ISO C++ Library.  This library 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, or (at your option)
+// any later version.
+
+// This library 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 library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+// 21.3.3 string capacity
+
+#include <string>
+#include <testsuite_hooks.h>
+
+// libstdc++/18654
+void test01()
+{
+  using namespace std;
+  bool test __attribute__((unused)) = true;
+
+  typedef string::size_type size_type;
+
+  // Our current implementation provides exact shrink-to-size
+  // and shrink-to-fit (in the future, maybe this will change
+  // for short strings).
+  const size_type minsize = 2 << 0;
+  const size_type maxsize = 2 << 20;
+  for (size_type i = minsize; i <= maxsize; i *= 2)
+    {
+      string str(i, 'x');
+      str.reserve(3 * i);
+
+      str.reserve(2 * i);
+      VERIFY( str.capacity() == 2 * i );
+
+      str.reserve();
+      VERIFY( str.capacity() == i );
+    }
+}
+
+int main()
+{
+  test01();
+  return 0;
+}