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

test/input.output/file.streams/fstreams/fstream.members/open_string.xfail.pass.cpp

@@ -0,0 +1,48 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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_fstream
+
+// void open(const string& s, ios_base::openmode mode = ios_base::in|ios_base::out);
+
+#include <fstream>
+#include <cassert>
+
+int main()
+{
+    {
+        std::fstream fs;
+        assert(!fs.is_open());
+        fs.open(std::string("test.dat"), std::ios_base::in | std::ios_base::out
+                                                           | std::ios_base::trunc);
+        assert(fs.is_open());
+        double x = 0;
+        fs << 3.25;
+        fs.seekg(0);
+        fs >> x;
+        assert(x == 3.25);
+    }
+    std::remove("test.dat");
+    {
+        std::wfstream fs;
+        assert(!fs.is_open());
+        fs.open(std::string("test.dat"), std::ios_base::in | std::ios_base::out
+                                                           | std::ios_base::trunc);
+        assert(fs.is_open());
+        double x = 0;
+        fs << 3.25;
+        fs.seekg(0);
+        fs >> x;
+        assert(x == 3.25);
+    }
+    std::remove("test.dat");
+}