tests/src/unit-ordered_json.cpp

//     __ _____ _____ _____
//  __|  |   __|     |   | |  JSON for Modern C++ (supporting code)
// |  |  |__   |  |  | | | |  version 3.11.3
// |_____|_____|_____|_|___|  https://github.com/nlohmann/json
//
// SPDX-FileCopyrightText: 2013-2023 Niels Lohmann <https://nlohmann.me>
// SPDX-License-Identifier: MIT

#include "doctest_compatibility.h"

#include <nlohmann/json.hpp>
using nlohmann::json;
using nlohmann::ordered_json;

TEST_CASE("ordered_json")
{
    json j;
    ordered_json oj;

    j["element3"] = 3;
    j["element1"] = 1;
    j["element2"] = 2;

    oj["element3"] = 3;
    oj["element1"] = 1;
    oj["element2"] = 2;

    CHECK(j.dump() == "{\"element1\":1,\"element2\":2,\"element3\":3}");
    CHECK(oj.dump() == "{\"element3\":3,\"element1\":1,\"element2\":2}");

    CHECK(j == json(oj));
    CHECK(ordered_json(json(oj)) == ordered_json(j));

    j.erase("element1");
    oj.erase("element1");

    CHECK(j.dump() == "{\"element2\":2,\"element3\":3}");
    CHECK(oj.dump() == "{\"element3\":3,\"element2\":2}");

    // remove again and nothing changes
    j.erase("element1");
    oj.erase("element1");

    CHECK(j.dump() == "{\"element2\":2,\"element3\":3}");
    CHECK(oj.dump() == "{\"element3\":3,\"element2\":2}");

    // There are no dup keys cause constructor calls emplace...
    json const multi{ { "z", 1 }, { "m", 2 }, { "m", 3 }, { "y", 4 }, { "m", 5 } };
    CHECK(multi.size() == 3);
    CHECK(multi.dump() == "{\"m\":2,\"y\":4,\"z\":1}");

    ordered_json multi_ordered{ { "z", 1 }, { "m", 2 }, { "m", 3 }, { "y", 4 }, { "m", 5 } };
    CHECK(multi_ordered.size() == 3);
    CHECK(multi_ordered.dump() == "{\"z\":1,\"m\":2,\"y\":4}");
    CHECK(multi_ordered.erase("m") == 1);
    CHECK(multi_ordered.dump() == "{\"z\":1,\"y\":4}");

    // Ranged insert test.
    // It seems that values shouldn't be overwritten. Only new values are added
    json j1{ { "c", 1 }, { "b", 2 }, { "a", 3 } };
    const json j2{ { "c", 77 }, { "d", 42 }, { "a", 4 } };
    j1.insert(j2.cbegin(), j2.cend());
    CHECK(j1.size() == 4);
    CHECK(j1.dump() == "{\"a\":3,\"b\":2,\"c\":1,\"d\":42}");

    ordered_json oj1{ { "c", 1 }, { "b", 2 }, { "a", 3 } };
    const ordered_json oj2{ { "c", 77 }, { "d", 42 }, { "a", 4 } };
    oj1.insert(oj2.cbegin(), oj2.cend());
    CHECK(oj1.size() == 4);
    CHECK(oj1.dump() == "{\"c\":1,\"b\":2,\"a\":3,\"d\":42}");
}