to_string is in its own header

test/to_string.cpp

@@ -0,0 +1,47 @@
+//
+// Copyright (c) 2019 Vinnie Falco (vinnie.falco@gmail.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/cppalliance/json
+//
+
+// Test that header file is self-contained.
+#include <boost/json/to_string.hpp>
+
+#include <boost/json/parse.hpp>
+
+#include "test_suite.hpp"
+
+namespace boost {
+namespace json {
+
+class to_string_test
+{
+public:
+    void
+    testToString()
+    {
+        BOOST_TEST(
+            to_string(parse("[1,2,3]")) == "[1,2,3]");
+    }
+
+    void
+    testOstream()
+    {
+    }
+
+    void
+    run()
+    {
+        testToString();
+        testOstream();
+    }
+};
+
+TEST_SUITE(to_string_test, "boost.json.to_string");
+
+} // json
+} // boost
+