Add more tests for JsonObjectConst

extras/tests/JsonObjectConst/subscript.cpp

@@ -0,0 +1,33 @@
+// ArduinoJson - https://arduinojson.org
+// Copyright © 2014-2024, Benoit BLANCHON
+// MIT License
+
+#include <ArduinoJson.h>
+#include <catch.hpp>
+
+#include "Allocators.hpp"
+
+TEST_CASE("JsonObjectConst::operator[]") {
+  JsonDocument doc;
+  doc["hello"] = "world";
+  JsonObjectConst obj = doc.as<JsonObjectConst>();
+
+  SECTION("supports const char*") {
+    REQUIRE(obj["hello"] == "world");  // issue #2019
+  }
+
+  SECTION("supports std::string") {
+    REQUIRE(obj[std::string("hello")] == "world");  // issue #2019
+  }
+
+#if defined(HAS_VARIABLE_LENGTH_ARRAY) && \
+    !defined(SUBSCRIPT_CONFLICTS_WITH_BUILTIN_OPERATOR)
+  SECTION("supports VLA") {
+    size_t i = 16;
+    char vla[i];
+    strcpy(vla, "hello");
+
+    REQUIRE(std::string("world") == obj[vla]);
+  }
+#endif
+}