ArduinoJson/extras/tests/JsonDocument/assignment.cpp

// ArduinoJson - https://arduinojson.org
// Copyright © 2014-2023, Benoit BLANCHON
// MIT License

#include <ArduinoJson.h>
#include <catch.hpp>

using ArduinoJson::detail::sizeofArray;
using ArduinoJson::detail::sizeofObject;

TEST_CASE("JsonDocument assignment") {
  SECTION("Copy assignment reallocates when capacity is smaller") {
    JsonDocument doc1(1234);
    deserializeJson(doc1, "{\"hello\":\"world\"}");
    JsonDocument doc2(8);

    doc2 = doc1;

    REQUIRE(doc2.as<std::string>() == "{\"hello\":\"world\"}");
    REQUIRE(doc2.capacity() == doc1.capacity());
  }

  SECTION("Copy assignment reallocates when capacity is larger") {
    JsonDocument doc1(100);
    deserializeJson(doc1, "{\"hello\":\"world\"}");
    JsonDocument doc2(1234);

    doc2 = doc1;

    REQUIRE(doc2.as<std::string>() == "{\"hello\":\"world\"}");
    REQUIRE(doc2.capacity() == doc1.capacity());
  }

  SECTION("Assign from JsonObject") {
    JsonDocument doc1(200);
    JsonObject obj = doc1.to<JsonObject>();
    obj["hello"] = "world";

    JsonDocument doc2(4096);
    doc2 = obj;

    REQUIRE(doc2.as<std::string>() == "{\"hello\":\"world\"}");
    REQUIRE(doc2.capacity() == 4096);
  }

  SECTION("Assign from JsonArray") {
    JsonDocument doc1(200);
    JsonArray arr = doc1.to<JsonArray>();
    arr.add("hello");

    JsonDocument doc2(4096);
    doc2 = arr;

    REQUIRE(doc2.as<std::string>() == "[\"hello\"]");
    REQUIRE(doc2.capacity() == 4096);
  }

  SECTION("Assign from JsonVariant") {
    JsonDocument doc1(200);
    deserializeJson(doc1, "42");

    JsonDocument doc2(4096);
    doc2 = doc1.as<JsonVariant>();

    REQUIRE(doc2.as<std::string>() == "42");
    REQUIRE(doc2.capacity() == 4096);
  }

  SECTION("Assign from MemberProxy") {
    JsonDocument doc1(200);
    doc1["value"] = 42;

    JsonDocument doc2(4096);
    doc2 = doc1["value"];

    REQUIRE(doc2.as<std::string>() == "42");
    REQUIRE(doc2.capacity() == 4096);
  }

  SECTION("Assign from ElementProxy") {
    JsonDocument doc1(200);
    doc1[0] = 42;

    JsonDocument doc2(4096);
    doc2 = doc1[0];

    REQUIRE(doc2.as<std::string>() == "42");
    REQUIRE(doc2.capacity() == 4096);
  }
}