JsonVariant automatically promotes to JsonObject or JsonArray on write

test/MemberProxy/CMakeLists.txt

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+# ArduinoJson - arduinojson.org
+# Copyright Benoit Blanchon 2014-2018
+# MIT License
+
+add_executable(MemberProxyTests
+	add.cpp
+	subscript.cpp
+	set.cpp
+)
+
+target_link_libraries(MemberProxyTests catch)
+add_test(MemberProxy MemberProxyTests)

test/MemberProxy/add.cpp

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+// ArduinoJson - arduinojson.org
+// Copyright Benoit Blanchon 2014-2018
+// MIT License
+
+#include <ArduinoJson.h>
+#include <catch.hpp>
+
+using namespace ARDUINOJSON_NAMESPACE;
+
+TEST_CASE("MemberProxy::add()") {
+  DynamicJsonDocument doc(4096);
+  MemberProxy<JsonDocument&, const char*> mp = doc["hello"];
+
+  SECTION("add(int)") {
+    mp.add(42);
+
+    REQUIRE(doc.as<std::string>() == "{\"hello\":[42]}");
+  }
+
+  SECTION("add(const char*)") {
+    mp.add("world");
+
+    REQUIRE(doc.as<std::string>() == "{\"hello\":[\"world\"]}");
+  }
+}

test/MemberProxy/set.cpp

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+// ArduinoJson - arduinojson.org
+// Copyright Benoit Blanchon 2014-2018
+// MIT License
+
+#include <ArduinoJson.h>
+#include <catch.hpp>
+
+using namespace ARDUINOJSON_NAMESPACE;
+
+TEST_CASE("MemberProxy::set()") {
+  DynamicJsonDocument doc(4096);
+  MemberProxy<JsonDocument&, const char*> mp = doc["hello"];
+
+  SECTION("set(int)") {
+    mp.set(42);
+
+    REQUIRE(doc.as<std::string>() == "{\"hello\":42}");
+  }
+
+  SECTION("set(const char*)") {
+    mp.set("world");
+
+    REQUIRE(doc.as<std::string>() == "{\"hello\":\"world\"}");
+  }
+}

test/MemberProxy/subscript.cpp

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+// ArduinoJson - arduinojson.org
+// Copyright Benoit Blanchon 2014-2018
+// MIT License
+
+#include <ArduinoJson.h>
+#include <catch.hpp>
+
+using namespace ARDUINOJSON_NAMESPACE;
+
+TEST_CASE("MemberProxy::operator[]") {
+  DynamicJsonDocument doc(4096);
+  MemberProxy<JsonDocument&, const char*> mp = doc["hello"];
+
+  SECTION("set integer") {
+    mp["world"] = 42;
+
+    REQUIRE(doc.as<std::string>() == "{\"hello\":{\"world\":42}}");
+  }
+}