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libraries/ArduinoJson/extras/tests/JsonObject/size.cpp

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+// ArduinoJson - https://arduinojson.org
+// Copyright © 2014-2025, Benoit BLANCHON
+// MIT License
+
+#include <ArduinoJson.h>
+#include <catch.hpp>
+#include <string>
+
+TEST_CASE("JsonObject::size()") {
+  JsonDocument doc;
+  JsonObject obj = doc.to<JsonObject>();
+
+  SECTION("initial size is zero") {
+    REQUIRE(0 == obj.size());
+  }
+
+  SECTION("increases when values are added") {
+    obj["hello"] = 42;
+    REQUIRE(1 == obj.size());
+  }
+
+  SECTION("decreases when values are removed") {
+    obj["hello"] = 42;
+    obj.remove("hello");
+    REQUIRE(0 == obj.size());
+  }
+
+  SECTION("doesn't increase when the same key is added twice") {
+    obj["hello"] = 1;
+    obj["hello"] = 2;
+    REQUIRE(1 == obj.size());
+  }
+
+  SECTION("doesn't decrease when another key is removed") {
+    obj["hello"] = 1;
+    obj.remove("world");
+    REQUIRE(1 == obj.size());
+  }
+}