Ported test of Gbathree's bug

test/Printers.hpp

@@ -0,0 +1,14 @@
+// Copyright Benoit Blanchon 2014
+// MIT License
+//
+// Arduino JSON library
+// https://github.com/bblanchon/ArduinoJson
+
+#pragma once
+
+#include <ArduinoJson/JsonValue.hpp>
+#include <ostream>
+
+namespace ArduinoJson {
+std::ostream& operator<<(std::ostream& os, const ArduinoJson::JsonValue& v);
+}