Move test into test/std subdirectory.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@224658 91177308-0d34-0410-b5e6-96231b3b80d8

test/std/input.output/string.streams/ostringstream/ostringstream.assign/nonmember_swap.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.
+//
+//===----------------------------------------------------------------------===//
+
+// <sstream>
+
+// template <class charT, class traits = char_traits<charT>, class Allocator = allocator<charT> >
+// class basic_ostringstream
+
+// void swap(basic_ostringstream& rhs);
+
+#include <sstream>
+#include <cassert>
+
+int main()
+{
+    {
+        std::ostringstream ss0(" 123 456");
+        std::ostringstream ss;
+        swap(ss, ss0);
+        assert(ss.rdbuf() != 0);
+        assert(ss.good());
+        assert(ss.str() == " 123 456");
+        int i = 234;
+        ss << i << ' ' << 567;;
+        assert(ss.str() == "234 5676");
+        ss0 << i << ' ' << 567;;
+        assert(ss0.str() == "234 567");
+    }
+    {
+        std::wostringstream ss0(L" 123 456");
+        std::wostringstream ss;
+        swap(ss, ss0);
+        assert(ss.rdbuf() != 0);
+        assert(ss.good());
+        assert(ss.str() == L" 123 456");
+        int i = 234;
+        ss << i << ' ' << 567;;
+        assert(ss.str() == L"234 5676");
+        ss0 << i << ' ' << 567;;
+        assert(ss0.str() == L"234 567");
+    }
+}