Added support for non zero-terminated strings (fixes #704)

test/JsonSerializer/std_stream.cpp

@@ -0,0 +1,64 @@
+// ArduinoJson - arduinojson.org
+// Copyright Benoit Blanchon 2014-2018
+// MIT License
+
+#include <ArduinoJson.h>
+#include <catch.hpp>
+#include <sstream>
+
+TEST_CASE("operator<<(std::ostream)") {
+  DynamicJsonDocument doc;
+  std::ostringstream os;
+
+  SECTION("JsonVariant containing false") {
+    JsonVariant variant = false;
+
+    os << variant;
+
+    REQUIRE("false" == os.str());
+  }
+
+  SECTION("JsonVariant containing string") {
+    JsonVariant variant = "coucou";
+
+    os << variant;
+
+    REQUIRE("\"coucou\"" == os.str());
+  }
+
+  SECTION("JsonObject") {
+    JsonObject& object = doc.to<JsonObject>();
+    object["key"] = "value";
+
+    os << object;
+
+    REQUIRE("{\"key\":\"value\"}" == os.str());
+  }
+
+  SECTION("JsonObjectSubscript") {
+    JsonObject& object = doc.to<JsonObject>();
+    object["key"] = "value";
+
+    os << object["key"];
+
+    REQUIRE("\"value\"" == os.str());
+  }
+
+  SECTION("JsonArray") {
+    JsonArray& array = doc.to<JsonArray>();
+    array.add("value");
+
+    os << array;
+
+    REQUIRE("[\"value\"]" == os.str());
+  }
+
+  SECTION("JsonArraySubscript") {
+    JsonArray& array = doc.to<JsonArray>();
+    array.add("value");
+
+    os << array[0];
+
+    REQUIRE("\"value\"" == os.str());
+  }
+}