Fixed object keys not being duplicated

test/JsonObject/copy.cpp

@@ -0,0 +1,59 @@
+// ArduinoJson - arduinojson.org
+// Copyright Benoit Blanchon 2014-2018
+// MIT License
+
+#include <ArduinoJson.h>
+#include <catch.hpp>
+
+TEST_CASE("JsonObject::copyFrom()") {
+  DynamicJsonDocument doc1;
+  DynamicJsonDocument doc2;
+
+  JsonObject obj1 = doc1.to<JsonObject>();
+  JsonObject obj2 = doc2.to<JsonObject>();
+
+  SECTION("doesn't copy static string in key or value") {
+    obj1["hello"] = "world";
+
+    obj2.copyFrom(obj1);
+
+    REQUIRE(doc1.memoryUsage() == doc2.memoryUsage());
+    REQUIRE(obj2["hello"] == std::string("world"));
+  }
+
+  SECTION("copy local string value") {
+    obj1["hello"] = std::string("world");
+
+    obj2.copyFrom(obj1);
+
+    REQUIRE(doc1.memoryUsage() == doc2.memoryUsage());
+    REQUIRE(obj2["hello"] == std::string("world"));
+  }
+
+  SECTION("copy local key") {
+    obj1[std::string("hello")] = "world";
+
+    obj2.copyFrom(obj1);
+
+    REQUIRE(doc1.memoryUsage() == doc2.memoryUsage());
+    REQUIRE(obj2["hello"] == std::string("world"));
+  }
+
+  SECTION("copy string from deserializeJson()") {
+    deserializeJson(doc1, "{'hello':'world'}");
+
+    obj2.copyFrom(obj1);
+
+    REQUIRE(doc1.memoryUsage() == doc2.memoryUsage());
+    REQUIRE(obj2["hello"] == std::string("world"));
+  }
+
+  SECTION("copy string from deserializeMsgPack()") {
+    deserializeMsgPack(doc1, "\x81\xA5hello\xA5world");
+
+    obj2.copyFrom(obj1);
+
+    REQUIRE(doc1.memoryUsage() == doc2.memoryUsage());
+    REQUIRE(obj2["hello"] == std::string("world"));
+  }
+}