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diff --git a/libstdc++-v3/testsuite/27_io/basic_filebuf/sungetc/char/2-io.cc b/libstdc++-v3/testsuite/27_io/basic_filebuf/sungetc/char/2-io.cc
new file mode 100644
index 00000000..753154ea
--- /dev/null
+++ b/libstdc++-v3/testsuite/27_io/basic_filebuf/sungetc/char/2-io.cc
@@ -0,0 +1,83 @@
+// 2001-05-21 Benjamin Kosnik  <bkoz@redhat.com>
+
+// Copyright (C) 2001, 2002, 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
+
+// { dg-require-fileio "" }
+
+#include <fstream>
+#include <testsuite_hooks.h>
+#include <testsuite_io.h>
+
+// @require@ %-*.tst %-*.txt
+// @diff@ %-*.tst %*.txt
+
+const char name_01[] = "tmp_sungetc_2io.tst"; // empty file, need to create
+
+void test01() 
+{
+  using namespace std;
+  using namespace __gnu_test;
+
+  typedef filebuf::int_type 	int_type;
+  typedef filebuf::traits_type 	traits_type;
+  typedef size_t 		size_type;
+
+  bool test __attribute__((unused)) = true;
+  streamsize 			strmsz_1, strmsz_2;
+  int_type 			c1, c2, c3;
+
+  // int_type sungetc()
+  // if in_cur not avail, return pbackfail(), else decrement and
+  // return to_int_type(*gptr())
+
+  // in | out
+  {
+    constraint_filebuf fb_01;
+    fb_01.pubsetbuf(0, 0);
+    fb_01.open(name_01, ios_base::out | ios_base::in | ios_base::trunc);
+    VERIFY( fb_01.unbuffered() );
+    fb_01.sputc('u');
+    fb_01.sputc('v');
+    fb_01.pubseekoff(-1, std::ios_base::end);
+    c3 = fb_01.sbumpc();
+    strmsz_1 = fb_01.in_avail();
+    c2 = fb_01.sungetc(); 
+    strmsz_2 = fb_01.in_avail();
+    VERIFY( c2 == 'v' ); //  VERIFY( c2 != traits_type::eof() );
+    VERIFY( strmsz_1 + 1 == strmsz_2 );
+    //test for _in_cur == _in_end
+    fb_01.pubseekoff(0, std::ios_base::end);
+    strmsz_1 = fb_01.in_avail(); // -1 cuz at the end
+    c1 = fb_01.sgetc(); 
+    c2 = fb_01.sungetc();
+    strmsz_2 = fb_01.in_avail(); // 1
+    c3 = fb_01.sgetc();
+    VERIFY( c1 != c2 );
+    VERIFY( strmsz_2 != strmsz_1 );
+    VERIFY( strmsz_2 == 1 );
+    VERIFY( fb_01.unbuffered() );
+  }
+}
+
+int main() 
+{
+  test01();
+  return 0;
+}