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/unbound.cpp

@@ -0,0 +1,66 @@
+// ArduinoJson - https://arduinojson.org
+// Copyright © 2014-2023, Benoit BLANCHON
+// MIT License
+
+#include <ArduinoJson.h>
+#include <catch.hpp>
+
+TEST_CASE("Unbound JsonVariant") {
+  JsonVariant variant;
+
+  SECTION("as<T>()") {
+    CHECK(variant.as<bool>() == false);
+    CHECK(variant.as<int>() == 0);
+    CHECK(variant.as<float>() == 0.0f);
+    CHECK(variant.as<const char*>() == 0);
+    CHECK(variant.as<std::string>() == "null");
+    CHECK(variant.as<JsonVariant>().isNull());
+    CHECK(variant.as<JsonVariantConst>().isNull());
+    CHECK(variant.as<JsonArray>().isNull());
+    CHECK(variant.as<JsonArrayConst>().isNull());
+    CHECK(variant.as<JsonObject>().isNull());
+    CHECK(variant.as<JsonObjectConst>().isNull());
+    CHECK(variant.as<JsonString>().isNull());
+  }
+
+  SECTION("is<T>()") {
+    CHECK_FALSE(variant.is<bool>());
+    CHECK_FALSE(variant.is<int>());
+    CHECK_FALSE(variant.is<float>());
+    CHECK_FALSE(variant.is<const char*>());
+    CHECK_FALSE(variant.is<std::string>());
+    CHECK_FALSE(variant.is<JsonVariant>());
+    CHECK_FALSE(variant.is<JsonVariantConst>());
+    CHECK_FALSE(variant.is<JsonArray>());
+    CHECK_FALSE(variant.is<JsonArrayConst>());
+    CHECK_FALSE(variant.is<JsonObject>());
+    CHECK_FALSE(variant.is<JsonObjectConst>());
+    CHECK_FALSE(variant.is<JsonString>());
+  }
+
+  SECTION("set()") {
+    CHECK_FALSE(variant.set("42"));
+    CHECK_FALSE(variant.set(42.0));
+    CHECK_FALSE(variant.set(42L));
+    CHECK_FALSE(variant.set(42U));
+    CHECK_FALSE(variant.set(serialized("42")));
+    CHECK_FALSE(variant.set(true));
+  }
+
+  SECTION("add()") {
+    CHECK_FALSE(variant.add("42"));
+    CHECK_FALSE(variant.add(42.0));
+    CHECK_FALSE(variant.add(42L));
+    CHECK_FALSE(variant.add(42U));
+    CHECK_FALSE(variant.add(serialized("42")));
+    CHECK_FALSE(variant.add(true));
+  }
+
+  SECTION("operator[]") {
+    CHECK(variant[0].isNull());
+    CHECK(variant["key"].isNull());
+    CHECK_FALSE(variant[0].set(1));
+    CHECK_FALSE(variant["key"].set(1));
+    CHECK_FALSE(variant[std::string("key")].set(1));
+  }
+}