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// __ _____ _____ _____
// __| | __| | | | JSON for Modern C++ (supporting code)
// | | |__ | | | | | | version 3.12.0
// |_____|_____|_____|_|___| https://github.com/nlohmann/json
//
// SPDX-FileCopyrightText: 2013-2026 Niels Lohmann <https://nlohmann.me>
// SPDX-License-Identifier: MIT
#include "doctest_compatibility.h"
#include <nlohmann/json.hpp>
using nlohmann::json;
#include <sstream>
#include <iomanip>
TEST_CASE("serialization")
{
SECTION("operator<<")
{
SECTION("no given width")
{
std::stringstream ss;
const json j = {"foo", 1, 2, 3, false, {{"one", 1}}};
ss << j;
CHECK(ss.str() == "[\"foo\",1,2,3,false,{\"one\":1}]");
}
SECTION("given width")
{
std::stringstream ss;
const json j = {"foo", 1, 2, 3, false, {{"one", 1}}};
ss << std::setw(4) << j;
CHECK(ss.str() ==
"[\n \"foo\",\n 1,\n 2,\n 3,\n false,\n {\n \"one\": 1\n }\n]");
}
SECTION("given fill")
{
std::stringstream ss;
const json j = {"foo", 1, 2, 3, false, {{"one", 1}}};
ss << std::setw(1) << std::setfill('\t') << j;
CHECK(ss.str() ==
"[\n\t\"foo\",\n\t1,\n\t2,\n\t3,\n\tfalse,\n\t{\n\t\t\"one\": 1\n\t}\n]");
}
}
SECTION("operator>>")
{
SECTION("no given width")
{
std::stringstream ss;
const json j = {"foo", 1, 2, 3, false, {{"one", 1}}};
j >> ss;
CHECK(ss.str() == "[\"foo\",1,2,3,false,{\"one\":1}]");
}
SECTION("given width")
{
std::stringstream ss;
const json j = {"foo", 1, 2, 3, false, {{"one", 1}}};
ss.width(4);
j >> ss;
CHECK(ss.str() ==
"[\n \"foo\",\n 1,\n 2,\n 3,\n false,\n {\n \"one\": 1\n }\n]");
}
SECTION("given fill")
{
std::stringstream ss;
const json j = {"foo", 1, 2, 3, false, {{"one", 1}}};
ss.width(1);
ss.fill('\t');
j >> ss;
CHECK(ss.str() ==
"[\n\t\"foo\",\n\t1,\n\t2,\n\t3,\n\tfalse,\n\t{\n\t\t\"one\": 1\n\t}\n]");
}
}
SECTION("dump")
{
SECTION("invalid character")
{
const json j = "ä\xA9ü";
CHECK_THROWS_WITH_AS(j.dump(), "[json.exception.type_error.316] invalid UTF-8 byte at index 2: 0xA9", json::type_error&);
CHECK_THROWS_WITH_AS(j.dump(1, ' ', false, json::error_handler_t::strict), "[json.exception.type_error.316] invalid UTF-8 byte at index 2: 0xA9", json::type_error&);
CHECK(j.dump(-1, ' ', false, json::error_handler_t::ignore) == "\"äü\"");
CHECK(j.dump(-1, ' ', false, json::error_handler_t::replace) == "\"ä\xEF\xBF\xBDü\"");
CHECK(j.dump(-1, ' ', true, json::error_handler_t::replace) == "\"\\u00e4\\ufffd\\u00fc\"");
}
SECTION("ending with incomplete character")
{
const json j = "123\xC2";
CHECK_THROWS_WITH_AS(j.dump(), "[json.exception.type_error.316] incomplete UTF-8 string; last byte: 0xC2", json::type_error&);
CHECK_THROWS_AS(j.dump(1, ' ', false, json::error_handler_t::strict), json::type_error&);
CHECK(j.dump(-1, ' ', false, json::error_handler_t::ignore) == "\"123\"");
CHECK(j.dump(-1, ' ', false, json::error_handler_t::replace) == "\"123\xEF\xBF\xBD\"");
CHECK(j.dump(-1, ' ', true, json::error_handler_t::replace) == "\"123\\ufffd\"");
}
SECTION("unexpected character")
{
const json j = "123\xF1\xB0\x34\x35\x36";
CHECK_THROWS_WITH_AS(j.dump(), "[json.exception.type_error.316] invalid UTF-8 byte at index 5: 0x34", json::type_error&);
CHECK_THROWS_AS(j.dump(1, ' ', false, json::error_handler_t::strict), json::type_error&);
CHECK(j.dump(-1, ' ', false, json::error_handler_t::ignore) == "\"123456\"");
CHECK(j.dump(-1, ' ', false, json::error_handler_t::replace) == "\"123\xEF\xBF\xBD\x34\x35\x36\"");
CHECK(j.dump(-1, ' ', true, json::error_handler_t::replace) == "\"123\\ufffd456\"");
}
SECTION("U+FFFD Substitution of Maximal Subparts")
{
// Some tests (mostly) from
// https://www.unicode.org/versions/Unicode11.0.0/ch03.pdf
// Section 3.9 -- U+FFFD Substitution of Maximal Subparts
auto test = [&](std::string const & input, std::string const & expected)
{
const json j = input;
CHECK(j.dump(-1, ' ', true, json::error_handler_t::replace) == "\"" + expected + "\"");
};
test("\xC2", "\\ufffd");
test("\xC2\x41\x42", "\\ufffd" "\x41" "\x42");
test("\xC2\xF4", "\\ufffd" "\\ufffd");
test("\xF0\x80\x80\x41", "\\ufffd" "\\ufffd" "\\ufffd" "\x41");
test("\xF1\x80\x80\x41", "\\ufffd" "\x41");
test("\xF2\x80\x80\x41", "\\ufffd" "\x41");
test("\xF3\x80\x80\x41", "\\ufffd" "\x41");
test("\xF4\x80\x80\x41", "\\ufffd" "\x41");
test("\xF5\x80\x80\x41", "\\ufffd" "\\ufffd" "\\ufffd" "\x41");
test("\xF0\x90\x80\x41", "\\ufffd" "\x41");
test("\xF1\x90\x80\x41", "\\ufffd" "\x41");
test("\xF2\x90\x80\x41", "\\ufffd" "\x41");
test("\xF3\x90\x80\x41", "\\ufffd" "\x41");
test("\xF4\x90\x80\x41", "\\ufffd" "\\ufffd" "\\ufffd" "\x41");
test("\xF5\x90\x80\x41", "\\ufffd" "\\ufffd" "\\ufffd" "\x41");
test("\xC0\xAF\xE0\x80\xBF\xF0\x81\x82\x41", "\\ufffd" "\\ufffd" "\\ufffd" "\\ufffd" "\\ufffd" "\\ufffd" "\\ufffd" "\\ufffd" "\x41");
test("\xED\xA0\x80\xED\xBF\xBF\xED\xAF\x41", "\\ufffd" "\\ufffd" "\\ufffd" "\\ufffd" "\\ufffd" "\\ufffd" "\\ufffd" "\\ufffd" "\x41");
test("\xF4\x91\x92\x93\xFF\x41\x80\xBF\x42", "\\ufffd" "\\ufffd" "\\ufffd" "\\ufffd" "\\ufffd" "\x41" "\\ufffd""\\ufffd" "\x42");
test("\xE1\x80\xE2\xF0\x91\x92\xF1\xBF\x41", "\\ufffd" "\\ufffd" "\\ufffd" "\\ufffd" "\x41");
}
}
SECTION("to_string")
{
auto test = [&](std::string const & input, std::string const & expected)
{
using std::to_string;
const json j = input;
CHECK(to_string(j) == "\"" + expected + "\"");
};
test(R"({"x":5,"y":6})", R"({\"x\":5,\"y\":6})");
test("{\"x\":[10,null,null,null]}", R"({\"x\":[10,null,null,null]})");
test("test", "test");
test("[3,\"false\",false]", R"([3,\"false\",false])");
}
}
TEST_CASE_TEMPLATE("serialization for extreme integer values", T, int32_t, uint32_t, int64_t, uint64_t) // NOLINT(readability-math-missing-parentheses, bugprone-throwing-static-initialization)
{
SECTION("minimum")
{
constexpr auto minimum = (std::numeric_limits<T>::min)();
const json j = minimum;
CHECK(j.dump() == std::to_string(minimum));
}
SECTION("maximum")
{
constexpr auto maximum = (std::numeric_limits<T>::max)();
const json j = maximum;
CHECK(j.dump() == std::to_string(maximum));
}
}
TEST_CASE("dump with binary values")
{
auto binary = json::binary({1, 2, 3, 4});
auto binary_empty = json::binary({});
auto binary_with_subtype = json::binary({1, 2, 3, 4}, 128);
auto binary_empty_with_subtype = json::binary({}, 128);
const json object = {{"key", binary}};
const json object_empty = {{"key", binary_empty}};
const json object_with_subtype = {{"key", binary_with_subtype}};
const json object_empty_with_subtype = {{"key", binary_empty_with_subtype}};
const json array = {"value", 1, binary};
const json array_empty = {"value", 1, binary_empty};
const json array_with_subtype = {"value", 1, binary_with_subtype};
const json array_empty_with_subtype = {"value", 1, binary_empty_with_subtype};
SECTION("normal")
{
CHECK(binary.dump() == "{\"bytes\":[1,2,3,4],\"subtype\":null}");
CHECK(binary_empty.dump() == "{\"bytes\":[],\"subtype\":null}");
CHECK(binary_with_subtype.dump() == "{\"bytes\":[1,2,3,4],\"subtype\":128}");
CHECK(binary_empty_with_subtype.dump() == "{\"bytes\":[],\"subtype\":128}");
CHECK(object.dump() == "{\"key\":{\"bytes\":[1,2,3,4],\"subtype\":null}}");
CHECK(object_empty.dump() == "{\"key\":{\"bytes\":[],\"subtype\":null}}");
CHECK(object_with_subtype.dump() == "{\"key\":{\"bytes\":[1,2,3,4],\"subtype\":128}}");
CHECK(object_empty_with_subtype.dump() == "{\"key\":{\"bytes\":[],\"subtype\":128}}");
CHECK(array.dump() == "[\"value\",1,{\"bytes\":[1,2,3,4],\"subtype\":null}]");
CHECK(array_empty.dump() == "[\"value\",1,{\"bytes\":[],\"subtype\":null}]");
CHECK(array_with_subtype.dump() == "[\"value\",1,{\"bytes\":[1,2,3,4],\"subtype\":128}]");
CHECK(array_empty_with_subtype.dump() == "[\"value\",1,{\"bytes\":[],\"subtype\":128}]");
}
SECTION("pretty-printed")
{
CHECK(binary.dump(4) == "{\n"
" \"bytes\": [1, 2, 3, 4],\n"
" \"subtype\": null\n"
"}");
CHECK(binary_empty.dump(4) == "{\n"
" \"bytes\": [],\n"
" \"subtype\": null\n"
"}");
CHECK(binary_with_subtype.dump(4) == "{\n"
" \"bytes\": [1, 2, 3, 4],\n"
" \"subtype\": 128\n"
"}");
CHECK(binary_empty_with_subtype.dump(4) == "{\n"
" \"bytes\": [],\n"
" \"subtype\": 128\n"
"}");
CHECK(object.dump(4) == "{\n"
" \"key\": {\n"
" \"bytes\": [1, 2, 3, 4],\n"
" \"subtype\": null\n"
" }\n"
"}");
CHECK(object_empty.dump(4) == "{\n"
" \"key\": {\n"
" \"bytes\": [],\n"
" \"subtype\": null\n"
" }\n"
"}");
CHECK(object_with_subtype.dump(4) == "{\n"
" \"key\": {\n"
" \"bytes\": [1, 2, 3, 4],\n"
" \"subtype\": 128\n"
" }\n"
"}");
CHECK(object_empty_with_subtype.dump(4) == "{\n"
" \"key\": {\n"
" \"bytes\": [],\n"
" \"subtype\": 128\n"
" }\n"
"}");
CHECK(array.dump(4) == "[\n"
" \"value\",\n"
" 1,\n"
" {\n"
" \"bytes\": [1, 2, 3, 4],\n"
" \"subtype\": null\n"
" }\n"
"]");
CHECK(array_empty.dump(4) == "[\n"
" \"value\",\n"
" 1,\n"
" {\n"
" \"bytes\": [],\n"
" \"subtype\": null\n"
" }\n"
"]");
CHECK(array_with_subtype.dump(4) == "[\n"
" \"value\",\n"
" 1,\n"
" {\n"
" \"bytes\": [1, 2, 3, 4],\n"
" \"subtype\": 128\n"
" }\n"
"]");
CHECK(array_empty_with_subtype.dump(4) == "[\n"
" \"value\",\n"
" 1,\n"
" {\n"
" \"bytes\": [],\n"
" \"subtype\": 128\n"
" }\n"
"]");
}
}
|
