RawJson() accepts any kind of string and obeys to duplication rules

test/Misc/CMakeLists.txt

@@ -8,6 +8,7 @@ add_executable(MiscTests
 	std_stream.cpp
 	std_string.cpp
 	StringBuilder.cpp
+	StringTraits.cpp
 	TypeTraits.cpp
 	unsigned_char.cpp
 	vla.cpp

test/Misc/StringTraits.cpp

@@ -0,0 +1,22 @@
+// ArduinoJson - arduinojson.org
+// Copyright Benoit Blanchon 2014-2018
+// MIT License
+
+#include <ArduinoJson.h>
+#include <catch.hpp>
+
+using namespace ArduinoJson::Internals;
+
+template <typename String>
+bool should_duplicate() {
+  return StringTraits<String>::should_duplicate;
+}
+
+TEST_CASE("StringTraits") {
+  SECTION("should_duplicate") {
+    REQUIRE(false == should_duplicate<const char*>());
+    REQUIRE(true == should_duplicate<char*>());
+    REQUIRE(true == should_duplicate<RawJsonString<char*> >());
+    REQUIRE(false == should_duplicate<RawJsonString<const char*> >());
+  }
+}

test/Misc/TypeTraits.cpp

@@ -4,7 +4,6 @@
 
 #include <ArduinoJson.h>
 #include <catch.hpp>
-#include <sstream>
 
 using namespace ArduinoJson::TypeTraits;
 
@@ -31,12 +30,6 @@ TEST_CASE("TypeTraits") {
     REQUIRE(static_cast<bool>(IsVariant<JsonVariant>::value));
   }
 
-  SECTION("IsString") {
-    REQUIRE((IsString<const char*>::value));
-    REQUIRE((IsString<std::string>::value));
-    REQUIRE_FALSE((IsString<double>::value));
-  }
-
   SECTION("IsConst") {
     REQUIRE_FALSE((IsConst<char>::value));
     REQUIRE((IsConst<const char>::value));