githubmirror/json

test/src/unit-regression2.cpp
840 строк27 KB
Niels Lohmann
:bookmark: set version to 3.10.5
03 янв 2022, 00:35
03 янв 2022, 00:35b5364fa
/*
    __ _____ _____ _____
 __|  |   __|     |   | |  JSON for Modern C++ (test suite)
|  |  |__   |  |  | | | |  version 3.10.5
|_____|_____|_____|_|___|  https://github.com/nlohmann/json

Licensed under the MIT License <http://opensource.org/licenses/MIT>.
SPDX-License-Identifier: MIT
Copyright (c) 2013-2022 Niels Lohmann <http://nlohmann.me>.

Permission is hereby  granted, free of charge, to any  person obtaining a copy
of this software and associated  documentation files (the "Software"), to deal
in the Software  without restriction, including without  limitation the rights
to  use, copy,  modify, merge,  publish, distribute,  sublicense, and/or  sell
copies  of  the Software,  and  to  permit persons  to  whom  the Software  is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE  IS PROVIDED "AS  IS", WITHOUT WARRANTY  OF ANY KIND,  EXPRESS OR
IMPLIED,  INCLUDING BUT  NOT  LIMITED TO  THE  WARRANTIES OF  MERCHANTABILITY,
FITNESS FOR  A PARTICULAR PURPOSE AND  NONINFRINGEMENT. IN NO EVENT  SHALL THE
AUTHORS  OR COPYRIGHT  HOLDERS  BE  LIABLE FOR  ANY  CLAIM,  DAMAGES OR  OTHER
LIABILITY, WHETHER IN AN ACTION OF  CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE  OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
*/

#include "doctest_compatibility.h"

// for some reason including this after the json header leads to linker errors with VS 2017...
#include <locale>

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

#include <cstdio>
#include <list>
#include <type_traits>
#include <utility>

#if (defined(__cplusplus) && __cplusplus >= 201703L) || (defined(_HAS_CXX17) && _HAS_CXX17 == 1)  // fix for issue #464
    #define JSON_HAS_CPP_17
#endif

#ifdef JSON_HAS_CPP_17
    #include <variant>

    #if !defined(JSON_HAS_FILESYSTEM) && !defined(JSON_HAS_EXPERIMENTAL_FILESYSTEM)
        #if defined(__cpp_lib_filesystem)
            #define JSON_HAS_FILESYSTEM 1
        #elif defined(__cpp_lib_experimental_filesystem)
            #define JSON_HAS_EXPERIMENTAL_FILESYSTEM 1
        #elif !defined(__has_include)
            #define JSON_HAS_EXPERIMENTAL_FILESYSTEM 1
        #elif __has_include(<filesystem>)
            #define JSON_HAS_FILESYSTEM 1
        #elif __has_include(<experimental/filesystem>)
            #define JSON_HAS_EXPERIMENTAL_FILESYSTEM 1
        #endif

        // std::filesystem does not work on MinGW GCC 8: https://sourceforge.net/p/mingw-w64/bugs/737/
        #if defined(__MINGW32__) && defined(__GNUC__) && __GNUC__ == 8
            #undef JSON_HAS_FILESYSTEM
            #undef JSON_HAS_EXPERIMENTAL_FILESYSTEM
        #endif

        // no filesystem support before GCC 8: https://en.cppreference.com/w/cpp/compiler_support
        #if defined(__GNUC__) && __GNUC__ < 8 && !defined(__clang__)
            #undef JSON_HAS_FILESYSTEM
            #undef JSON_HAS_EXPERIMENTAL_FILESYSTEM
        #endif

        // no filesystem support before Clang 7: https://en.cppreference.com/w/cpp/compiler_support
        #if defined(__clang_major__) && __clang_major__ < 7
            #undef JSON_HAS_FILESYSTEM
            #undef JSON_HAS_EXPERIMENTAL_FILESYSTEM
        #endif

        // no filesystem support before MSVC 19.14: https://en.cppreference.com/w/cpp/compiler_support
        #if defined(_MSC_VER) && _MSC_VER < 1940
            #undef JSON_HAS_FILESYSTEM
            #undef JSON_HAS_EXPERIMENTAL_FILESYSTEM
        #endif

        // no filesystem support before iOS 13
        #if defined(__IPHONE_OS_VERSION_MIN_REQUIRED) && __IPHONE_OS_VERSION_MIN_REQUIRED < 130000
            #undef JSON_HAS_FILESYSTEM
            #undef JSON_HAS_EXPERIMENTAL_FILESYSTEM
        #endif

        // no filesystem support before macOS Catalina
        #if defined(__MAC_OS_X_VERSION_MIN_REQUIRED) && __MAC_OS_X_VERSION_MIN_REQUIRED < 101500
            #undef JSON_HAS_FILESYSTEM
            #undef JSON_HAS_EXPERIMENTAL_FILESYSTEM
        #endif
    #endif
#endif

#ifndef JSON_HAS_EXPERIMENTAL_FILESYSTEM
    #define JSON_HAS_EXPERIMENTAL_FILESYSTEM 0
#endif

#ifndef JSON_HAS_FILESYSTEM
    #define JSON_HAS_FILESYSTEM 0
#endif

#if JSON_HAS_EXPERIMENTAL_FILESYSTEM
#include <experimental/filesystem>
namespace nlohmann::detail
{
namespace std_fs = std::experimental::filesystem;
} // namespace nlohmann::detail
#elif JSON_HAS_FILESYSTEM
#include <filesystem>
namespace nlohmann::detail
{
namespace std_fs = std::filesystem;
} // namespace nlohmann::detail
#endif


#ifdef JSON_HAS_CPP_20
    #include <span>
#endif

// NLOHMANN_JSON_SERIALIZE_ENUM uses a static std::pair
DOCTEST_CLANG_SUPPRESS_WARNING_PUSH
DOCTEST_CLANG_SUPPRESS_WARNING("-Wexit-time-destructors")

/////////////////////////////////////////////////////////////////////
// for #1021
/////////////////////////////////////////////////////////////////////

using float_json = nlohmann::basic_json<std::map, std::vector, std::string, bool, std::int64_t, std::uint64_t, float>;

/////////////////////////////////////////////////////////////////////
// for #1647
/////////////////////////////////////////////////////////////////////
namespace
{
struct NonDefaultFromJsonStruct
{};

inline bool operator==(NonDefaultFromJsonStruct const& /*unused*/, NonDefaultFromJsonStruct const& /*unused*/)
{
    return true;
}

enum class for_1647
{
    one,
    two
};

// NOLINTNEXTLINE(cppcoreguidelines-avoid-c-arrays,hicpp-avoid-c-arrays,modernize-avoid-c-arrays): this is a false positive
NLOHMANN_JSON_SERIALIZE_ENUM(for_1647,
{
    {for_1647::one, "one"},
    {for_1647::two, "two"},
})
}  // namespace

/////////////////////////////////////////////////////////////////////
// for #1299
/////////////////////////////////////////////////////////////////////

struct Data
{
    Data() = default;
    Data(std::string a_, std::string b_)
        : a(std::move(a_))
        , b(std::move(b_))
    {}
    std::string a{};
    std::string b{};
};

void from_json(const json& j, Data& data);
void from_json(const json& j, Data& data)
{
    j["a"].get_to(data.a);
    j["b"].get_to(data.b);
}

bool operator==(Data const& lhs, Data const& rhs);
bool operator==(Data const& lhs, Data const& rhs)
{
    return lhs.a == rhs.a && lhs.b == rhs.b;
}

//bool operator!=(Data const& lhs, Data const& rhs)
//{
//    return !(lhs == rhs);
//}

namespace nlohmann
{
template<>
struct adl_serializer<NonDefaultFromJsonStruct>
{
    static NonDefaultFromJsonStruct from_json(json const& /*unused*/) noexcept
    {
        return {};
    }
};
}  // namespace nlohmann

/////////////////////////////////////////////////////////////////////
// for #1805
/////////////////////////////////////////////////////////////////////

struct NotSerializableData
{
    int mydata;
    float myfloat;
};

/////////////////////////////////////////////////////////////////////
// for #2574
/////////////////////////////////////////////////////////////////////

struct NonDefaultConstructible
{
    explicit NonDefaultConstructible(int a)
        : x(a)
    {}
    int x;
};

namespace nlohmann
{
template<>
struct adl_serializer<NonDefaultConstructible>
{
    static NonDefaultConstructible from_json(json const& j)
    {
        return NonDefaultConstructible(j.get<int>());
    }
};
}  // namespace nlohmann

/////////////////////////////////////////////////////////////////////
// for #2824
/////////////////////////////////////////////////////////////////////

class sax_no_exception : public nlohmann::detail::json_sax_dom_parser<json>
{
  public:
    explicit sax_no_exception(json& j)
        : nlohmann::detail::json_sax_dom_parser<json>(j, false)
    {}

    static bool parse_error(std::size_t /*position*/, const std::string& /*last_token*/, const json::exception& ex)
    {
        error_string = new std::string(ex.what());  // NOLINT(cppcoreguidelines-owning-memory)
        return false;
    }

    static std::string* error_string;
};

std::string* sax_no_exception::error_string = nullptr;

/////////////////////////////////////////////////////////////////////
// for #2982
/////////////////////////////////////////////////////////////////////

template<class T>
class my_allocator : public std::allocator<T>
{};

/////////////////////////////////////////////////////////////////////
// for #3077
/////////////////////////////////////////////////////////////////////

class FooAlloc
{};

class Foo
{
  public:
    explicit Foo(const FooAlloc& /* unused */ = FooAlloc()) {}

    bool value = false;
};

class FooBar
{
  public:
    Foo foo{};
};

inline void from_json(const nlohmann::json& j, FooBar& fb)
{
    j.at("value").get_to(fb.foo.value);
}

TEST_CASE("regression tests 2")
{
    SECTION("issue #1001 - Fix memory leak during parser callback")
    {
        const auto* geojsonExample = R"(
          { "type": "FeatureCollection",
            "features": [
              { "type": "Feature",
                "geometry": {"type": "Point", "coordinates": [102.0, 0.5]},
                "properties": {"prop0": "value0"}
                },
              { "type": "Feature",
                "geometry": {
                  "type": "LineString",
                  "coordinates": [
                    [102.0, 0.0], [103.0, 1.0], [104.0, 0.0], [105.0, 1.0]
                    ]
                  },
                "properties": {
                  "prop0": "value0",
                  "prop1": 0.0
                  }
                },
              { "type": "Feature",
                 "geometry": {
                   "type": "Polygon",
                   "coordinates": [
                     [ [100.0, 0.0], [101.0, 0.0], [101.0, 1.0],
                       [100.0, 1.0], [100.0, 0.0] ]
                     ]
                 },
                 "properties": {
                   "prop0": "value0",
                   "prop1": {"this": "that"}
                   }
                 }
               ]
             })";

        json::parser_callback_t cb = [&](int /*level*/, json::parse_event_t event, json & parsed)
        {
            // skip uninteresting events
            if (event == json::parse_event_t::value && !parsed.is_primitive())
            {
                return false;
            }

            switch (event)
            {
                case json::parse_event_t::key:
                {
                    return true;
                }
                case json::parse_event_t::value:
                {
                    return false;
                }
                case json::parse_event_t::object_start:
                {
                    return true;
                }
                case json::parse_event_t::object_end:
                {
                    return false;
                }
                case json::parse_event_t::array_start:
                {
                    return true;
                }
                case json::parse_event_t::array_end:
                {
                    return false;
                }

                default:
                {
                    return true;
                }
            }
        };

        auto j = json::parse(geojsonExample, cb, true);
        CHECK(j == json());
    }

    SECTION("issue #1021 - to/from_msgpack only works with standard typization")
    {
        float_json j = 1000.0;
        CHECK(float_json::from_cbor(float_json::to_cbor(j)) == j);
        CHECK(float_json::from_msgpack(float_json::to_msgpack(j)) == j);
        CHECK(float_json::from_ubjson(float_json::to_ubjson(j)) == j);

        float_json j2 = {1000.0, 2000.0, 3000.0};
        CHECK(float_json::from_ubjson(float_json::to_ubjson(j2, true, true)) == j2);
    }

    SECTION("issue #1045 - Using STL algorithms with JSON containers with expected results?")
    {
        json diffs = nlohmann::json::array();
        json m1{{"key1", 42}};
        json m2{{"key2", 42}};
        auto p1 = m1.items();
        auto p2 = m2.items();

        using it_type = decltype(p1.begin());

        std::set_difference(
            p1.begin(),
            p1.end(),
            p2.begin(),
            p2.end(),
            std::inserter(diffs, diffs.end()),
            [&](const it_type & e1, const it_type & e2) -> bool
        {
            using comper_pair = std::pair<std::string, decltype(e1.value())>;              // Trying to avoid unneeded copy
            return comper_pair(e1.key(), e1.value()) < comper_pair(e2.key(), e2.value());  // Using pair comper
        });

        CHECK(diffs.size() == 1);  // Note the change here, was 2
    }

#ifdef JSON_HAS_CPP_17
    SECTION("issue #1292 - Serializing std::variant causes stack overflow")
    {
        static_assert(!std::is_constructible<json, std::variant<int, float>>::value, "unexpected value");
    }
#endif

    SECTION("issue #1299 - compile error in from_json converting to container "
            "with std::pair")
    {
        json j =
        {
            {"1", {{"a", "testa_1"}, {"b", "testb_1"}}},
            {"2", {{"a", "testa_2"}, {"b", "testb_2"}}},
            {"3", {{"a", "testa_3"}, {"b", "testb_3"}}},
        };

        std::map<std::string, Data> expected
        {
            {"1", {"testa_1", "testb_1"}},
            {"2", {"testa_2", "testb_2"}},
            {"3", {"testa_3", "testb_3"}},
        };
        const auto data = j.get<decltype(expected)>();
        CHECK(expected == data);
    }

    SECTION("issue #1445 - buffer overflow in dumping invalid utf-8 strings")
    {
        SECTION("a bunch of -1, ensure_ascii=true")
        {
            const auto length = 300;

            json dump_test;
            dump_test["1"] = std::string(length, -1);

            std::string expected = R"({"1":")";
            for (int i = 0; i < length; ++i)
            {
                expected += "\\ufffd";
            }
            expected += "\"}";

            auto s = dump_test.dump(-1, ' ', true, nlohmann::json::error_handler_t::replace);
            CHECK(s == expected);
        }
        SECTION("a bunch of -2, ensure_ascii=false")
        {
            const auto length = 500;

            json dump_test;
            dump_test["1"] = std::string(length, -2);

            std::string expected = R"({"1":")";
            for (int i = 0; i < length; ++i)
            {
                expected += "\xEF\xBF\xBD";
            }
            expected += "\"}";

            auto s = dump_test.dump(-1, ' ', false, nlohmann::json::error_handler_t::replace);
            CHECK(s == expected);
        }
        SECTION("test case in issue #1445")
        {
            nlohmann::json dump_test;
            const std::array<int, 108> data =
            {
                {109, 108, 103, 125, -122, -53, 115, 18, 3, 0, 102, 19, 1, 15, -110, 13, -3, -1, -81, 32, 2, 0, 0, 0, 0, 0, 0, 0, 8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, -80, 2, 0, 0, 96, -118, 46, -116, 46, 109, -84, -87, 108, 14, 109, -24, -83, 13, -18, -51, -83, -52, -115, 14, 6, 32, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 64, 3, 0, 0, 0, 35, -74, -73, 55, 57, -128, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 33, 0, 0, 0, -96, -54, -28, -26}
            };
            std::string s;
            for (int i : data)
            {
                s += static_cast<char>(i);
            }
            dump_test["1"] = s;
            dump_test.dump(-1, ' ', true, nlohmann::json::error_handler_t::replace);
        }
    }

    SECTION("issue #1447 - Integer Overflow (OSS-Fuzz 12506)")
    {
        json j = json::parse("[-9223372036854775808]");
        CHECK(j.dump() == "[-9223372036854775808]");
    }

    SECTION("issue #1708 - minimum value of int64_t can be outputted")
    {
        constexpr auto smallest = (std::numeric_limits<int64_t>::min)();
        json j = smallest;
        CHECK(j.dump() == std::to_string(smallest));
    }

    SECTION("issue #1727 - Contains with non-const lvalue json_pointer picks the wrong overload")
    {
        json j = {{"root", {{"settings", {{"logging", true}}}}}};

        auto jptr1 = "/root/settings/logging"_json_pointer;
        auto jptr2 = json::json_pointer{"/root/settings/logging"};

        CHECK(j.contains(jptr1));
        CHECK(j.contains(jptr2));
    }

    SECTION("issue #1647 - compile error when deserializing enum if both non-default from_json and non-member operator== exists for other type")
    {
        {
            json j;
            NonDefaultFromJsonStruct x(j);
            NonDefaultFromJsonStruct y;
            CHECK(x == y);
        }

        auto val = nlohmann::json("one").get<for_1647>();
        CHECK(val == for_1647::one);
        json j = val;
    }

    SECTION("issue #1715 - json::from_cbor does not respect allow_exceptions = false when input is string literal")
    {
        SECTION("string literal")
        {
            json cbor = json::from_cbor("B", true, false);
            CHECK(cbor.is_discarded());
        }

        SECTION("string array")
        {
            const std::array<char, 2> input = {{'B', 0x00}};
            json cbor = json::from_cbor(input, true, false);
            CHECK(cbor.is_discarded());
        }

        SECTION("std::string")
        {
            json cbor = json::from_cbor(std::string("B"), true, false);
            CHECK(cbor.is_discarded());
        }
    }

    SECTION("issue #1805 - A pair<T1, T2> is json constructible only if T1 and T2 are json constructible")
    {
        static_assert(!std::is_constructible<json, std::pair<std::string, NotSerializableData>>::value, "unexpected result");
        static_assert(!std::is_constructible<json, std::pair<NotSerializableData, std::string>>::value, "unexpected result");
        static_assert(std::is_constructible<json, std::pair<int, std::string>>::value, "unexpected result");
    }
    SECTION("issue #1825 - A tuple<Args..> is json constructible only if all T in Args are json constructible")
    {
        static_assert(!std::is_constructible<json, std::tuple<std::string, NotSerializableData>>::value, "unexpected result");
        static_assert(!std::is_constructible<json, std::tuple<NotSerializableData, std::string>>::value, "unexpected result");
        static_assert(std::is_constructible<json, std::tuple<int, std::string>>::value, "unexpected result");
    }

    SECTION("issue #1983 - JSON patch diff for op=add formation is not as per standard (RFC 6902)")
    {
        const auto source = R"({ "foo": [ "1", "2" ] })"_json;
        const auto target = R"({"foo": [ "1", "2", "3" ]})"_json;
        const auto result = json::diff(source, target);
        CHECK(result.dump() == R"([{"op":"add","path":"/foo/-","value":"3"}])");
    }

    SECTION("issue #2067 - cannot serialize binary data to text JSON")
    {
        const std::array<unsigned char, 23> data = {{0x81, 0xA4, 0x64, 0x61, 0x74, 0x61, 0xC4, 0x0F, 0x33, 0x30, 0x30, 0x32, 0x33, 0x34, 0x30, 0x31, 0x30, 0x37, 0x30, 0x35, 0x30, 0x31, 0x30}};
        json j = json::from_msgpack(data.data(), data.size());
        CHECK_NOTHROW(
            j.dump(4,                             // Indent
                   ' ',                           // Indent char
                   false,                         // Ensure ascii
                   json::error_handler_t::strict  // Error
                  ));
    }

    SECTION("PR #2181 - regression bug with lvalue")
    {
        // see https://github.com/nlohmann/json/pull/2181#issuecomment-653326060
        json j{{"x", "test"}};
        std::string defval = "default value";
        auto val = j.value("x", defval);
        auto val2 = j.value("y", defval);
    }

    SECTION("issue #2293 - eof doesn't cause parsing to stop")
    {
        std::vector<uint8_t> data =
        {
            0x7B,
            0x6F,
            0x62,
            0x6A,
            0x65,
            0x63,
            0x74,
            0x20,
            0x4F,
            0x42
        };
        json result = json::from_cbor(data, true, false);
        CHECK(result.is_discarded());
    }

    SECTION("issue #2315 - json.update and vector<pair>does not work with ordered_json")
    {
        nlohmann::ordered_json jsonAnimals = {{"animal", "dog"}};
        nlohmann::ordered_json jsonCat = {{"animal", "cat"}};
        jsonAnimals.update(jsonCat);
        CHECK(jsonAnimals["animal"] == "cat");

        auto jsonAnimals_parsed = nlohmann::ordered_json::parse(jsonAnimals.dump());
        CHECK(jsonAnimals == jsonAnimals_parsed);

        std::vector<std::pair<std::string, int64_t>> intData = {std::make_pair("aaaa", 11),
                                                                std::make_pair("bbb", 222)
                                                               };
        nlohmann::ordered_json jsonObj;
        for (const auto& data : intData)
        {
            jsonObj[data.first] = data.second;
        }
        CHECK(jsonObj["aaaa"] == 11);
        CHECK(jsonObj["bbb"] == 222);
    }

    SECTION("issue #2330 - ignore_comment=true fails on multiple consecutive lines starting with comments")
    {
        std::string ss = "//\n//\n{\n}\n";
        json j = json::parse(ss, nullptr, true, true);
        CHECK(j.dump() == "{}");
    }

#ifdef JSON_HAS_CPP_20
    SECTION("issue #2546 - parsing containers of std::byte")
    {
        const char DATA[] = R"("Hello, world!")";
        const auto s = std::as_bytes(std::span(DATA));
        json j = json::parse(s);
        CHECK(j.dump() == "\"Hello, world!\"");
    }
#endif

    SECTION("issue #2574 - Deserialization to std::array, std::pair, and std::tuple with non-default constructable types fails")
    {
        SECTION("std::array")
        {
            {
                json j = {7, 4};
                auto arr = j.get<std::array<NonDefaultConstructible, 2>>();
                CHECK(arr[0].x == 7);
                CHECK(arr[1].x == 4);
            }

            {
                json j = 7;
                CHECK_THROWS_AS((j.get<std::array<NonDefaultConstructible, 1>>()), json::type_error);
            }
        }

        SECTION("std::pair")
        {
            {
                json j = {3, 8};
                auto p = j.get<std::pair<NonDefaultConstructible, NonDefaultConstructible>>();
                CHECK(p.first.x == 3);
                CHECK(p.second.x == 8);
            }

            {
                json j = {4, 1};
                auto p = j.get<std::pair<int, NonDefaultConstructible>>();
                CHECK(p.first == 4);
                CHECK(p.second.x == 1);
            }

            {
                json j = {6, 7};
                auto p = j.get<std::pair<NonDefaultConstructible, int>>();
                CHECK(p.first.x == 6);
                CHECK(p.second == 7);
            }

            {
                json j = 7;
                CHECK_THROWS_AS((j.get<std::pair<NonDefaultConstructible, int>>()), json::type_error);
            }
        }

        SECTION("std::tuple")
        {
            {
                json j = {9};
                auto t = j.get<std::tuple<NonDefaultConstructible>>();
                CHECK(std::get<0>(t).x == 9);
            }

            {
                json j = {9, 8, 7};
                auto t = j.get<std::tuple<NonDefaultConstructible, int, NonDefaultConstructible>>();
                CHECK(std::get<0>(t).x == 9);
                CHECK(std::get<1>(t) == 8);
                CHECK(std::get<2>(t).x == 7);
            }

            {
                json j = 7;
                CHECK_THROWS_AS((j.get<std::tuple<NonDefaultConstructible>>()), json::type_error);
            }
        }
    }

    SECTION("issue #2865 - ASAN detects memory leaks")
    {
        // the code below is expected to not leak memory
        {
            nlohmann::json o;
            std::string s = "bar";

            nlohmann::to_json(o["foo"], s);

            nlohmann::json p = o;

            // call to_json with a non-null JSON value
            nlohmann::to_json(p["foo"], s);
        }

        {
            nlohmann::json o;
            std::string s = "bar";

            nlohmann::to_json(o["foo"], s);

            // call to_json with a non-null JSON value
            nlohmann::to_json(o["foo"], s);
        }
    }

    SECTION("issue #2824 - encoding of json::exception::what()")
    {
        json j;
        sax_no_exception sax(j);

        CHECK(!json::sax_parse("xyz", &sax));
        CHECK(*sax_no_exception::error_string == "[json.exception.parse_error.101] parse error at line 1, column 1: syntax error while parsing value - invalid literal; last read: 'x'");
        delete sax_no_exception::error_string;  // NOLINT(cppcoreguidelines-owning-memory)
    }

    SECTION("issue #2825 - Properly constrain the basic_json conversion operator")
    {
        static_assert(std::is_copy_assignable<nlohmann::ordered_json>::value, "ordered_json must be copy assignable");
    }

    SECTION("issue #2958 - Inserting in unordered json using a pointer retains the leading slash")
    {
        std::string p = "/root";

        // matching types
        json test1;
        test1[json::json_pointer(p)] = json::object();
        CHECK(test1.dump() == "{\"root\":{}}");

        ordered_json test2;
        test2[ordered_json::json_pointer(p)] = json::object();
        CHECK(test2.dump() == "{\"root\":{}}");

        // mixed type - the JSON Pointer is implicitly converted into a string "/root"
        ordered_json test3;
        test3[json::json_pointer(p)] = json::object();
        CHECK(test3.dump() == "{\"/root\":{}}");
    }

    SECTION("issue #2982 - to_{binary format} does not provide a mechanism for specifying a custom allocator for the returned type")
    {
        std::vector<std::uint8_t, my_allocator<std::uint8_t>> my_vector;
        json j = {1, 2, 3, 4};
        json::to_cbor(j, my_vector);
        json k = json::from_cbor(my_vector);
        CHECK(j == k);
    }

#if JSON_HAS_FILESYSTEM || JSON_HAS_EXPERIMENTAL_FILESYSTEM
    SECTION("issue #3070 - Version 3.10.3 breaks backward-compatibility with 3.10.2 ")
    {
        nlohmann::detail::std_fs::path text_path("/tmp/text.txt");
        json j(text_path);

        const auto j_path = j.get<nlohmann::detail::std_fs::path>();
        CHECK(j_path == text_path);

        CHECK_THROWS_WITH_AS(nlohmann::detail::std_fs::path(json(1)), "[json.exception.type_error.302] type must be string, but is number", json::type_error);
    }
#endif

    SECTION("issue #3077 - explicit constructor with default does not compile")
    {
        json j;
        j[0]["value"] = true;
        std::vector<FooBar> foo;
        j.get_to(foo);
    }

    SECTION("issue #3108 - ordered_json doesn't support range based erase")
    {
        ordered_json j = {1, 2, 2, 4};

        auto last = std::unique(j.begin(), j.end());
        j.erase(last, j.end());

        CHECK(j.dump() == "[1,2,4]");

        j.erase(std::remove_if(j.begin(), j.end(), [](const ordered_json & val)
        {
            return val == 2;
        }), j.end());

        CHECK(j.dump() == "[1,4]");
    }
}

DOCTEST_CLANG_SUPPRESS_WARNING_POP