use local library source instead to correct some black-box issue for aliyuniot

lib/ArduinoJson/extras/tests/MemberProxy/subscript.cpp

@@ -0,0 +1,19 @@
+// ArduinoJson - arduinojson.org
+// Copyright Benoit Blanchon 2014-2020
+// 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}}");
+  }
+}