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libraries/ArduinoJson/extras/tests/JsonObjectConst/subscript.cpp

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+// ArduinoJson - https://arduinojson.org
+// Copyright © 2014-2025, Benoit BLANCHON
+// MIT License
+
+#include <ArduinoJson.h>
+#include <catch.hpp>
+
+#include "Allocators.hpp"
+#include "Literals.hpp"
+
+TEST_CASE("JsonObjectConst::operator[]") {
+  JsonDocument doc;
+  doc["hello"] = "world";
+  doc["a\0b"_s] = "ABC";
+  JsonObjectConst obj = doc.as<JsonObjectConst>();
+
+  SECTION("supports const char*") {
+    REQUIRE(obj["hello"] == "world");  // issue #2019
+  }
+
+  SECTION("supports std::string") {
+    REQUIRE(obj["hello"_s] == "world");  // issue #2019
+    REQUIRE(obj["a\0b"_s] == "ABC");
+  }
+
+#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(obj[vla] == "world"_s);
+  }
+#endif
+
+  SECTION("supports JsonVariant") {
+    doc["key1"] = "hello";
+    doc["key2"] = "a\0b"_s;
+    doc["key3"] = "foo";
+    REQUIRE(obj[obj["key1"]] == "world");
+    REQUIRE(obj[obj["key2"]] == "ABC");
+    REQUIRE(obj[obj["key3"]] == nullptr);
+    REQUIRE(obj[obj["key4"]] == nullptr);
+  }
+}