--- /dev/null
+// Copyright (C) 2003, 2009 Free Software Foundation, Inc.
+//
+// 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/>.
+
+// 27.8.1.4 Overridden virtual functions
+
+#include <fstream>
+#include <testsuite_hooks.h>
+
+void test01()
+{
+ using namespace std;
+
+ bool test __attribute__((unused)) = true;
+ const char* name = "tmp_sync_1";
+
+ wfilebuf fb;
+
+ fb.open(name, ios_base::in | ios_base::out | ios_base::trunc);
+ fb.sputn(L"abc", 3);
+
+ fb.pubseekoff(0, ios_base::beg);
+ fb.sputc(L'1');
+
+ // Sync can't be used to switch from write mode to read mode.
+ fb.pubsync();
+
+ wfilebuf::int_type c = fb.sbumpc();
+ VERIFY( c == wfilebuf::traits_type::eof() );
+
+ fb.close();
+}
+
+int main()
+{
+ test01();
+ return 0;
+}