优化了平衡，尤其对于向后倾倒的几种极限情况进行优化

Shibo-main-TOMMY/lib/ArduinoJson/extras/tests/JsonVariant/containsKey.cpp

@@ -0,0 +1,42 @@
+// ArduinoJson - https://arduinojson.org
+// Copyright © 2014-2023, Benoit BLANCHON
+// MIT License
+
+#include <ArduinoJson.h>
+#include <stdint.h>
+#include <catch.hpp>
+
+TEST_CASE("JsonVariant::containsKey()") {
+  DynamicJsonDocument doc(4096);
+  JsonVariant var = doc.to<JsonVariant>();
+
+  SECTION("containsKey(const char*)") {
+    var["hello"] = "world";
+
+    REQUIRE(var.containsKey("hello") == true);
+    REQUIRE(var.containsKey("world") == false);
+  }
+
+  SECTION("containsKey(std::string)") {
+    var["hello"] = "world";
+
+    REQUIRE(var.containsKey(std::string("hello")) == true);
+    REQUIRE(var.containsKey(std::string("world")) == false);
+  }
+}
+
+TEST_CASE("JsonVariantConst::containsKey()") {
+  DynamicJsonDocument doc(4096);
+  doc["hello"] = "world";
+  JsonVariantConst cvar = doc.as<JsonVariant>();
+
+  SECTION("containsKey(const char*) returns true") {
+    REQUIRE(cvar.containsKey("hello") == true);
+    REQUIRE(cvar.containsKey("world") == false);
+  }
+
+  SECTION("containsKey(std::string) returns true") {
+    REQUIRE(cvar.containsKey(std::string("hello")) == true);
+    REQUIRE(cvar.containsKey(std::string("world")) == false);
+  }
+}