Add buffers_to_string

fix #772

test/beast/core/CMakeLists.txt

@@ -25,6 +25,7 @@ add_executable (tests-beast-core
     buffers_cat.cpp
     buffers_prefix.cpp
     buffers_suffix.cpp
+    buffers_to_string.cpp
     error.cpp
     file.cpp
     file_posix.cpp

test/beast/core/Jamfile

@@ -15,6 +15,7 @@ local SOURCES =
     buffers_cat.cpp
     buffers_prefix.cpp
     buffers_suffix.cpp
+    buffers_to_string.cpp
     error.cpp
     file.cpp
     file_posix.cpp

test/beast/core/buffers_to_string.cpp

@@ -0,0 +1,36 @@
+//
+// Copyright (c) 2016-2017 Vinnie Falco (vinnie dot falco at gmail dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+// Official repository: https://github.com/boostorg/beast
+//
+
+// Test that header file is self-contained.
+#include <boost/beast/core/buffers_to_string.hpp>
+
+#include <boost/beast/core/multi_buffer.hpp>
+#include <boost/beast/core/ostream.hpp>
+#include <boost/beast/unit_test/suite.hpp>
+
+namespace boost {
+namespace beast {
+
+class buffers_to_string_test : public unit_test::suite
+{
+public:
+    void
+    run() override
+    {
+        multi_buffer b;
+        ostream(b) << "Hello, ";
+        ostream(b) << "world!";
+        BEAST_EXPECT(buffers_to_string(b.data()) == "Hello, world!");
+    }
+};
+
+BEAST_DEFINE_TESTSUITE(beast,core,buffers_to_string);
+
+} // beast
+} // boost