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/iostream.format/input.streams/istream.unformatted/read.pass.cpp

@@ -0,0 +1,81 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// <istream>
+
+// basic_istream<charT,traits>& read(char_type* s, streamsize n);
+
+#include <istream>
+#include <cassert>
+
+template <class CharT>
+struct testbuf
+    : public std::basic_streambuf<CharT>
+{
+    typedef std::basic_string<CharT> string_type;
+    typedef std::basic_streambuf<CharT> base;
+private:
+    string_type str_;
+public:
+
+    testbuf() {}
+    testbuf(const string_type& str)
+        : str_(str)
+    {
+        base::setg(const_cast<CharT*>(str_.data()),
+                   const_cast<CharT*>(str_.data()),
+                   const_cast<CharT*>(str_.data()) + str_.size());
+    }
+
+    CharT* eback() const {return base::eback();}
+    CharT* gptr() const {return base::gptr();}
+    CharT* egptr() const {return base::egptr();}
+};
+
+int main()
+{
+    {
+        testbuf<char> sb(" 123456789");
+        std::istream is(&sb);
+        char s[5];
+        is.read(s, 5);
+        assert(!is.eof());
+        assert(!is.fail());
+        assert(std::string(s, 5) == " 1234");
+        assert(is.gcount() == 5);
+        is.read(s, 5);
+        assert(!is.eof());
+        assert(!is.fail());
+        assert(std::string(s, 5) == "56789");
+        assert(is.gcount() == 5);
+        is.read(s, 5);
+        assert( is.eof());
+        assert( is.fail());
+        assert(is.gcount() == 0);
+    }
+    {
+        testbuf<wchar_t> sb(L" 123456789");
+        std::wistream is(&sb);
+        wchar_t s[5];
+        is.read(s, 5);
+        assert(!is.eof());
+        assert(!is.fail());
+        assert(std::wstring(s, 5) == L" 1234");
+        assert(is.gcount() == 5);
+        is.read(s, 5);
+        assert(!is.eof());
+        assert(!is.fail());
+        assert(std::wstring(s, 5) == L"56789");
+        assert(is.gcount() == 5);
+        is.read(s, 5);
+        assert( is.eof());
+        assert( is.fail());
+        assert(is.gcount() == 0);
+    }
+}