test: Mark 316 tests as XFAIL to rename to xfail.pass.cpp.

test/input.output/file.streams/fstreams/ofstream.members/rdbuf.xfail.pass.cpp

@@ -0,0 +1,34 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <fstream>
+
+// template <class charT, class traits = char_traits<charT> >
+// class basic_ofstream
+
+// basic_filebuf<charT,traits>* rdbuf() const;
+
+#include <fstream>
+#include <cassert>
+
+int main()
+{
+    {
+        std::ofstream fs("test.dat");
+        std::filebuf* fb = fs.rdbuf();
+        assert(fb->sputc('r') == 'r');
+    }
+    remove("test.dat");
+    {
+        std::wofstream fs("test.dat");
+        std::wfilebuf* fb = fs.rdbuf();
+        assert(fb->sputc(L'r') == L'r');
+    }
+    remove("test.dat");
+}