test/src/unit-inspection.cpp - third_party/json - Git at Google

 /*
     __ _____ _____ _____
  __|  |   __|     |   | |  JSON for Modern C++ (test suite)
 |  |  |__   |  |  | | | |  version 3.9.1
 |_____|_____|_____|_|___|  https://github.com/nlohmann/json

 Licensed under the MIT License <http://opensource.org/licenses/MIT>.
 SPDX-License-Identifier: MIT
 Copyright (c) 2013-2019 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"

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

 #include <fstream>
 #include <sstream>
 #include <test_data.hpp>

 TEST_CASE("object inspection")
 {
     SECTION("convenience type checker")
     {
         SECTION("object")
         {
             json j {{"foo", 1}, {"bar", false}};
             CHECK(!j.is_null());
             CHECK(!j.is_boolean());
             CHECK(!j.is_number());
             CHECK(!j.is_number_integer());
             CHECK(!j.is_number_unsigned());
             CHECK(!j.is_number_float());
             CHECK(!j.is_binary());
             CHECK(j.is_object());
             CHECK(!j.is_array());
             CHECK(!j.is_string());
             CHECK(!j.is_discarded());
             CHECK(!j.is_primitive());
             CHECK(j.is_structured());
         }

         SECTION("array")
         {
             json j {"foo", 1, 1u, 42.23, false};
             CHECK(!j.is_null());
             CHECK(!j.is_boolean());
             CHECK(!j.is_number());
             CHECK(!j.is_number_integer());
             CHECK(!j.is_number_unsigned());
             CHECK(!j.is_number_float());
             CHECK(!j.is_binary());
             CHECK(!j.is_object());
             CHECK(j.is_array());
             CHECK(!j.is_string());
             CHECK(!j.is_discarded());
             CHECK(!j.is_primitive());
             CHECK(j.is_structured());
         }

         SECTION("null")
         {
             json j(nullptr);
             CHECK(j.is_null());
             CHECK(!j.is_boolean());
             CHECK(!j.is_number());
             CHECK(!j.is_number_integer());
             CHECK(!j.is_number_unsigned());
             CHECK(!j.is_number_float());
             CHECK(!j.is_binary());
             CHECK(!j.is_object());
             CHECK(!j.is_array());
             CHECK(!j.is_string());
             CHECK(!j.is_discarded());
             CHECK(j.is_primitive());
             CHECK(!j.is_structured());
         }

         SECTION("boolean")
         {
             json j(true);
             CHECK(!j.is_null());
             CHECK(j.is_boolean());
             CHECK(!j.is_number());
             CHECK(!j.is_number_integer());
             CHECK(!j.is_number_unsigned());
             CHECK(!j.is_number_float());
             CHECK(!j.is_binary());
             CHECK(!j.is_object());
             CHECK(!j.is_array());
             CHECK(!j.is_string());
             CHECK(!j.is_discarded());
             CHECK(j.is_primitive());
             CHECK(!j.is_structured());
         }

         SECTION("string")
         {
             json j("Hello world");
             CHECK(!j.is_null());
             CHECK(!j.is_boolean());
             CHECK(!j.is_number());
             CHECK(!j.is_number_integer());
             CHECK(!j.is_number_unsigned());
             CHECK(!j.is_number_float());
             CHECK(!j.is_binary());
             CHECK(!j.is_object());
             CHECK(!j.is_array());
             CHECK(j.is_string());
             CHECK(!j.is_discarded());
             CHECK(j.is_primitive());
             CHECK(!j.is_structured());
         }

         SECTION("number (integer)")
         {
             json j(42);
             CHECK(!j.is_null());
             CHECK(!j.is_boolean());
             CHECK(j.is_number());
             CHECK(j.is_number_integer());
             CHECK(!j.is_number_unsigned());
             CHECK(!j.is_number_float());
             CHECK(!j.is_binary());
             CHECK(!j.is_object());
             CHECK(!j.is_array());
             CHECK(!j.is_string());
             CHECK(!j.is_discarded());
             CHECK(j.is_primitive());
             CHECK(!j.is_structured());
         }

         SECTION("number (unsigned)")
         {
             json j(42u);
             CHECK(!j.is_null());
             CHECK(!j.is_boolean());
             CHECK(j.is_number());
             CHECK(j.is_number_integer());
             CHECK(j.is_number_unsigned());
             CHECK(!j.is_number_float());
             CHECK(!j.is_binary());
             CHECK(!j.is_object());
             CHECK(!j.is_array());
             CHECK(!j.is_string());
             CHECK(!j.is_discarded());
             CHECK(j.is_primitive());
             CHECK(!j.is_structured());
         }

         SECTION("number (floating-point)")
         {
             json j(42.23);
             CHECK(!j.is_null());
             CHECK(!j.is_boolean());
             CHECK(j.is_number());
             CHECK(!j.is_number_integer());
             CHECK(!j.is_number_unsigned());
             CHECK(j.is_number_float());
             CHECK(!j.is_binary());
             CHECK(!j.is_object());
             CHECK(!j.is_array());
             CHECK(!j.is_string());
             CHECK(!j.is_discarded());
             CHECK(j.is_primitive());
             CHECK(!j.is_structured());
         }

         SECTION("binary")
         {
             json j(json::value_t::binary);
             CHECK(!j.is_null());
             CHECK(!j.is_boolean());
             CHECK(!j.is_number());
             CHECK(!j.is_number_integer());
             CHECK(!j.is_number_unsigned());
             CHECK(!j.is_number_float());
             CHECK(j.is_binary());
             CHECK(!j.is_object());
             CHECK(!j.is_array());
             CHECK(!j.is_string());
             CHECK(!j.is_discarded());
             CHECK(j.is_primitive());
             CHECK(!j.is_structured());
         }

         SECTION("discarded")
         {
             json j(json::value_t::discarded);
             CHECK(!j.is_null());
             CHECK(!j.is_boolean());
             CHECK(!j.is_number());
             CHECK(!j.is_number_integer());
             CHECK(!j.is_number_unsigned());
             CHECK(!j.is_number_float());
             CHECK(!j.is_binary());
             CHECK(!j.is_object());
             CHECK(!j.is_array());
             CHECK(!j.is_string());
             CHECK(j.is_discarded());
             CHECK(!j.is_primitive());
             CHECK(!j.is_structured());
         }
     }

     SECTION("serialization")
     {
         json j {{"object", json::object()}, {"array", {1, 2, 3, 4}}, {"number", 42}, {"boolean", false}, {"null", nullptr}, {"string", "Hello world"} };

         SECTION("no indent / indent=-1")
         {
             CHECK(j.dump() ==
                   "{\"array\":[1,2,3,4],\"boolean\":false,\"null\":null,\"number\":42,\"object\":{},\"string\":\"Hello world\"}");

             CHECK(j.dump() == j.dump(-1));
         }

         SECTION("indent=0")
         {
             CHECK(j.dump(0) ==
                   "{\n\"array\": [\n1,\n2,\n3,\n4\n],\n\"boolean\": false,\n\"null\": null,\n\"number\": 42,\n\"object\": {},\n\"string\": \"Hello world\"\n}");
         }

         SECTION("indent=1, space='\t'")
         {
             CHECK(j.dump(1, '\t') ==
                   "{\n\t\"array\": [\n\t\t1,\n\t\t2,\n\t\t3,\n\t\t4\n\t],\n\t\"boolean\": false,\n\t\"null\": null,\n\t\"number\": 42,\n\t\"object\": {},\n\t\"string\": \"Hello world\"\n}");
         }

         SECTION("indent=4")
         {
             CHECK(j.dump(4) ==
                   "{\n    \"array\": [\n        1,\n        2,\n        3,\n        4\n    ],\n    \"boolean\": false,\n    \"null\": null,\n    \"number\": 42,\n    \"object\": {},\n    \"string\": \"Hello world\"\n}");
         }

         SECTION("indent=x")
         {
             CHECK(j.dump().size() == 94);
             CHECK(j.dump(1).size() == 127);
             CHECK(j.dump(2).size() == 142);
             CHECK(j.dump(512).size() == 7792);

             // important test, because it yields a resize of the indent_string
             // inside the dump() function
             CHECK(j.dump(1024).size() == 15472);

             const auto binary = json::binary({1, 2, 3}, 128);
             CHECK(binary.dump(1024).size() == 2086);
         }

         SECTION("dump and floating-point numbers")
         {
             auto s = json(42.23).dump();
             CHECK(s.find("42.23") != std::string::npos);
         }

         SECTION("dump and small floating-point numbers")
         {
             auto s = json(1.23456e-78).dump();
             CHECK(s.find("1.23456e-78") != std::string::npos);
         }

         SECTION("dump and non-ASCII characters")
         {
             CHECK(json("ä").dump() == "\"ä\"");
             CHECK(json("Ö").dump() == "\"Ö\"");
             CHECK(json("❤️").dump() == "\"❤️\"");
         }

         SECTION("dump with ensure_ascii and non-ASCII characters")
         {
             CHECK(json("ä").dump(-1, ' ', true) == "\"\\u00e4\"");
             CHECK(json("Ö").dump(-1, ' ', true) == "\"\\u00d6\"");
             CHECK(json("❤️").dump(-1, ' ', true) == "\"\\u2764\\ufe0f\"");
         }

         SECTION("full Unicode escaping to ASCII")
         {
             SECTION("parsing yields the same JSON value")
             {
                 std::ifstream f_escaped(TEST_DATA_DIRECTORY "/json_nlohmann_tests/all_unicode_ascii.json");
                 std::ifstream f_unescaped(TEST_DATA_DIRECTORY "/json_nlohmann_tests/all_unicode.json");

                 json j1 = json::parse(f_escaped);
                 json j2 = json::parse(f_unescaped);
                 CHECK(j1 == j2);
             }

             SECTION("dumping yields the same JSON text")
             {
                 std::ifstream f_escaped(TEST_DATA_DIRECTORY "/json_nlohmann_tests/all_unicode_ascii.json");
                 std::ifstream f_unescaped(TEST_DATA_DIRECTORY "/json_nlohmann_tests/all_unicode.json");

                 json value = json::parse(f_unescaped);
                 std::string text = value.dump(4, ' ', true);

                 std::string expected((std::istreambuf_iterator<char>(f_escaped)),
                                      std::istreambuf_iterator<char>());
                 CHECK(text == expected);
             }
         }

         SECTION("serialization of discarded element")
         {
             json j_discarded(json::value_t::discarded);
             CHECK(j_discarded.dump() == "<discarded>");
         }

         SECTION("check that precision is reset after serialization")
         {
             // create stringstream and set precision
             std::stringstream ss;
             ss.precision(3);
             ss << 3.141592653589793 << std::fixed;
             CHECK(ss.str() == "3.14");

             // reset stringstream
             ss.str(std::string());

             // use stringstream for JSON serialization
             json j_number = 3.14159265358979;
             ss << j_number;

             // check that precision has been overridden during serialization
             CHECK(ss.str() == "3.14159265358979");

             // check that precision has been restored
             CHECK(ss.precision() == 3);
         }
     }

     SECTION("round trips")
     {
         for (const auto& s :
                 {"3.141592653589793", "1000000000000000010E5"
                 })
         {
             json j1 = json::parse(s);
             std::string s1 = j1.dump();
             json j2 = json::parse(s1);
             std::string s2 = j2.dump();
             CHECK(s1 == s2);
         }
     }

     SECTION("return the type of the object (explicit)")
     {
         SECTION("null")
         {
             json j = nullptr;
             CHECK(j.type() == json::value_t::null);
         }

         SECTION("object")
         {
             json j = {{"foo", "bar"}};
             CHECK(j.type() == json::value_t::object);
         }

         SECTION("array")
         {
             json j = {1, 2, 3, 4};
             CHECK(j.type() == json::value_t::array);
         }

         SECTION("boolean")
         {
             json j = true;
             CHECK(j.type() == json::value_t::boolean);
         }

         SECTION("string")
         {
             json j = "Hello world";
             CHECK(j.type() == json::value_t::string);
         }

         SECTION("number (integer)")
         {
             json j = 23;
             CHECK(j.type() == json::value_t::number_integer);
         }

         SECTION("number (unsigned)")
         {
             json j = 23u;
             CHECK(j.type() == json::value_t::number_unsigned);
         }

         SECTION("number (floating-point)")
         {
             json j = 42.23;
             CHECK(j.type() == json::value_t::number_float);
         }
     }

     SECTION("return the type of the object (implicit)")
     {
         SECTION("null")
         {
             json j = nullptr;
             json::value_t t = j;
             CHECK(t == j.type());
         }

         SECTION("object")
         {
             json j = {{"foo", "bar"}};
             json::value_t t = j;
             CHECK(t == j.type());
         }

         SECTION("array")
         {
             json j = {1, 2, 3, 4};
             json::value_t t = j;
             CHECK(t == j.type());
         }

         SECTION("boolean")
         {
             json j = true;
             json::value_t t = j;
             CHECK(t == j.type());
         }

         SECTION("string")
         {
             json j = "Hello world";
             json::value_t t = j;
             CHECK(t == j.type());
         }

         SECTION("number (integer)")
         {
             json j = 23;
             json::value_t t = j;
             CHECK(t == j.type());
         }

         SECTION("number (unsigned)")
         {
             json j = 23u;
             json::value_t t = j;
             CHECK(t == j.type());
         }

         SECTION("number (floating-point)")
         {
             json j = 42.23;
             json::value_t t = j;
             CHECK(t == j.type());
         }

         SECTION("binary")
         {
             json j = json::binary({});
             json::value_t t = j;
             CHECK(t == j.type());
         }
     }
 }
	/*
	__ _____ _____ _____
	__\| \| __\| \| \| \| JSON for Modern C++ (test suite)
	\| \| \|__ \| \| \| \| \| \| version 3.9.1
	\|_____\|_____\|_____\|_\|___\| https://github.com/nlohmann/json

	Licensed under the MIT License <http://opensource.org/licenses/MIT>.
	SPDX-License-Identifier: MIT
	Copyright (c) 2013-2019 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"

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

	#include <fstream>
	#include <sstream>
	#include <test_data.hpp>

	TEST_CASE("object inspection")
	{
	SECTION("convenience type checker")
	{
	SECTION("object")
	{
	json j {{"foo", 1}, {"bar", false}};
	CHECK(!j.is_null());
	CHECK(!j.is_boolean());
	CHECK(!j.is_number());
	CHECK(!j.is_number_integer());
	CHECK(!j.is_number_unsigned());
	CHECK(!j.is_number_float());
	CHECK(!j.is_binary());
	CHECK(j.is_object());
	CHECK(!j.is_array());
	CHECK(!j.is_string());
	CHECK(!j.is_discarded());
	CHECK(!j.is_primitive());
	CHECK(j.is_structured());
	}

	SECTION("array")
	{
	json j {"foo", 1, 1u, 42.23, false};
	CHECK(!j.is_null());
	CHECK(!j.is_boolean());
	CHECK(!j.is_number());
	CHECK(!j.is_number_integer());
	CHECK(!j.is_number_unsigned());
	CHECK(!j.is_number_float());
	CHECK(!j.is_binary());
	CHECK(!j.is_object());
	CHECK(j.is_array());
	CHECK(!j.is_string());
	CHECK(!j.is_discarded());
	CHECK(!j.is_primitive());
	CHECK(j.is_structured());
	}

	SECTION("null")
	{
	json j(nullptr);
	CHECK(j.is_null());
	CHECK(!j.is_boolean());
	CHECK(!j.is_number());
	CHECK(!j.is_number_integer());
	CHECK(!j.is_number_unsigned());
	CHECK(!j.is_number_float());
	CHECK(!j.is_binary());
	CHECK(!j.is_object());
	CHECK(!j.is_array());
	CHECK(!j.is_string());
	CHECK(!j.is_discarded());
	CHECK(j.is_primitive());
	CHECK(!j.is_structured());
	}

	SECTION("boolean")
	{
	json j(true);
	CHECK(!j.is_null());
	CHECK(j.is_boolean());
	CHECK(!j.is_number());
	CHECK(!j.is_number_integer());
	CHECK(!j.is_number_unsigned());
	CHECK(!j.is_number_float());
	CHECK(!j.is_binary());
	CHECK(!j.is_object());
	CHECK(!j.is_array());
	CHECK(!j.is_string());
	CHECK(!j.is_discarded());
	CHECK(j.is_primitive());
	CHECK(!j.is_structured());
	}

	SECTION("string")
	{
	json j("Hello world");
	CHECK(!j.is_null());
	CHECK(!j.is_boolean());
	CHECK(!j.is_number());
	CHECK(!j.is_number_integer());
	CHECK(!j.is_number_unsigned());
	CHECK(!j.is_number_float());
	CHECK(!j.is_binary());
	CHECK(!j.is_object());
	CHECK(!j.is_array());
	CHECK(j.is_string());
	CHECK(!j.is_discarded());
	CHECK(j.is_primitive());
	CHECK(!j.is_structured());
	}

	SECTION("number (integer)")
	{
	json j(42);
	CHECK(!j.is_null());
	CHECK(!j.is_boolean());
	CHECK(j.is_number());
	CHECK(j.is_number_integer());
	CHECK(!j.is_number_unsigned());
	CHECK(!j.is_number_float());
	CHECK(!j.is_binary());
	CHECK(!j.is_object());
	CHECK(!j.is_array());
	CHECK(!j.is_string());
	CHECK(!j.is_discarded());
	CHECK(j.is_primitive());
	CHECK(!j.is_structured());
	}

	SECTION("number (unsigned)")
	{
	json j(42u);
	CHECK(!j.is_null());
	CHECK(!j.is_boolean());
	CHECK(j.is_number());
	CHECK(j.is_number_integer());
	CHECK(j.is_number_unsigned());
	CHECK(!j.is_number_float());
	CHECK(!j.is_binary());
	CHECK(!j.is_object());
	CHECK(!j.is_array());
	CHECK(!j.is_string());
	CHECK(!j.is_discarded());
	CHECK(j.is_primitive());
	CHECK(!j.is_structured());
	}

	SECTION("number (floating-point)")
	{
	json j(42.23);
	CHECK(!j.is_null());
	CHECK(!j.is_boolean());
	CHECK(j.is_number());
	CHECK(!j.is_number_integer());
	CHECK(!j.is_number_unsigned());
	CHECK(j.is_number_float());
	CHECK(!j.is_binary());
	CHECK(!j.is_object());
	CHECK(!j.is_array());
	CHECK(!j.is_string());
	CHECK(!j.is_discarded());
	CHECK(j.is_primitive());
	CHECK(!j.is_structured());
	}

	SECTION("binary")
	{
	json j(json::value_t::binary);
	CHECK(!j.is_null());
	CHECK(!j.is_boolean());
	CHECK(!j.is_number());
	CHECK(!j.is_number_integer());
	CHECK(!j.is_number_unsigned());
	CHECK(!j.is_number_float());
	CHECK(j.is_binary());
	CHECK(!j.is_object());
	CHECK(!j.is_array());
	CHECK(!j.is_string());
	CHECK(!j.is_discarded());
	CHECK(j.is_primitive());
	CHECK(!j.is_structured());
	}

	SECTION("discarded")
	{
	json j(json::value_t::discarded);
	CHECK(!j.is_null());
	CHECK(!j.is_boolean());
	CHECK(!j.is_number());
	CHECK(!j.is_number_integer());
	CHECK(!j.is_number_unsigned());
	CHECK(!j.is_number_float());
	CHECK(!j.is_binary());
	CHECK(!j.is_object());
	CHECK(!j.is_array());
	CHECK(!j.is_string());
	CHECK(j.is_discarded());
	CHECK(!j.is_primitive());
	CHECK(!j.is_structured());
	}
	}

	SECTION("serialization")
	{
	json j {{"object", json::object()}, {"array", {1, 2, 3, 4}}, {"number", 42}, {"boolean", false}, {"null", nullptr}, {"string", "Hello world"} };

	SECTION("no indent / indent=-1")
	{
	CHECK(j.dump() ==
	"{\"array\":[1,2,3,4],\"boolean\":false,\"null\":null,\"number\":42,\"object\":{},\"string\":\"Hello world\"}");

	CHECK(j.dump() == j.dump(-1));
	}

	SECTION("indent=0")
	{
	CHECK(j.dump(0) ==
	"{\n\"array\": [\n1,\n2,\n3,\n4\n],\n\"boolean\": false,\n\"null\": null,\n\"number\": 42,\n\"object\": {},\n\"string\": \"Hello world\"\n}");
	}

	SECTION("indent=1, space='\t'")
	{
	CHECK(j.dump(1, '\t') ==
	"{\n\t\"array\": [\n\t\t1,\n\t\t2,\n\t\t3,\n\t\t4\n\t],\n\t\"boolean\": false,\n\t\"null\": null,\n\t\"number\": 42,\n\t\"object\": {},\n\t\"string\": \"Hello world\"\n}");
	}

	SECTION("indent=4")
	{
	CHECK(j.dump(4) ==
	"{\n \"array\": [\n 1,\n 2,\n 3,\n 4\n ],\n \"boolean\": false,\n \"null\": null,\n \"number\": 42,\n \"object\": {},\n \"string\": \"Hello world\"\n}");
	}

	SECTION("indent=x")
	{
	CHECK(j.dump().size() == 94);
	CHECK(j.dump(1).size() == 127);
	CHECK(j.dump(2).size() == 142);
	CHECK(j.dump(512).size() == 7792);

	// important test, because it yields a resize of the indent_string
	// inside the dump() function
	CHECK(j.dump(1024).size() == 15472);

	const auto binary = json::binary({1, 2, 3}, 128);
	CHECK(binary.dump(1024).size() == 2086);
	}

	SECTION("dump and floating-point numbers")
	{
	auto s = json(42.23).dump();
	CHECK(s.find("42.23") != std::string::npos);
	}

	SECTION("dump and small floating-point numbers")
	{
	auto s = json(1.23456e-78).dump();
	CHECK(s.find("1.23456e-78") != std::string::npos);
	}

	SECTION("dump and non-ASCII characters")
	{
	CHECK(json("ä").dump() == "\"ä\"");
	CHECK(json("Ö").dump() == "\"Ö\"");
	CHECK(json("❤️").dump() == "\"❤️\"");
	}

	SECTION("dump with ensure_ascii and non-ASCII characters")
	{
	CHECK(json("ä").dump(-1, ' ', true) == "\"\\u00e4\"");
	CHECK(json("Ö").dump(-1, ' ', true) == "\"\\u00d6\"");
	CHECK(json("❤️").dump(-1, ' ', true) == "\"\\u2764\\ufe0f\"");
	}

	SECTION("full Unicode escaping to ASCII")
	{
	SECTION("parsing yields the same JSON value")
	{
	std::ifstream f_escaped(TEST_DATA_DIRECTORY "/json_nlohmann_tests/all_unicode_ascii.json");
	std::ifstream f_unescaped(TEST_DATA_DIRECTORY "/json_nlohmann_tests/all_unicode.json");

	json j1 = json::parse(f_escaped);
	json j2 = json::parse(f_unescaped);
	CHECK(j1 == j2);
	}

	SECTION("dumping yields the same JSON text")
	{
	std::ifstream f_escaped(TEST_DATA_DIRECTORY "/json_nlohmann_tests/all_unicode_ascii.json");
	std::ifstream f_unescaped(TEST_DATA_DIRECTORY "/json_nlohmann_tests/all_unicode.json");

	json value = json::parse(f_unescaped);
	std::string text = value.dump(4, ' ', true);

	std::string expected((std::istreambuf_iterator<char>(f_escaped)),
	std::istreambuf_iterator<char>());
	CHECK(text == expected);
	}
	}

	SECTION("serialization of discarded element")
	{
	json j_discarded(json::value_t::discarded);
	CHECK(j_discarded.dump() == "<discarded>");
	}

	SECTION("check that precision is reset after serialization")
	{
	// create stringstream and set precision
	std::stringstream ss;
	ss.precision(3);
	ss << 3.141592653589793 << std::fixed;
	CHECK(ss.str() == "3.14");

	// reset stringstream
	ss.str(std::string());

	// use stringstream for JSON serialization
	json j_number = 3.14159265358979;
	ss << j_number;

	// check that precision has been overridden during serialization
	CHECK(ss.str() == "3.14159265358979");

	// check that precision has been restored
	CHECK(ss.precision() == 3);
	}
	}

	SECTION("round trips")
	{
	for (const auto& s :
	{"3.141592653589793", "1000000000000000010E5"
	})
	{
	json j1 = json::parse(s);
	std::string s1 = j1.dump();
	json j2 = json::parse(s1);
	std::string s2 = j2.dump();
	CHECK(s1 == s2);
	}
	}

	SECTION("return the type of the object (explicit)")
	{
	SECTION("null")
	{
	json j = nullptr;
	CHECK(j.type() == json::value_t::null);
	}

	SECTION("object")
	{
	json j = {{"foo", "bar"}};
	CHECK(j.type() == json::value_t::object);
	}

	SECTION("array")
	{
	json j = {1, 2, 3, 4};
	CHECK(j.type() == json::value_t::array);
	}

	SECTION("boolean")
	{
	json j = true;
	CHECK(j.type() == json::value_t::boolean);
	}

	SECTION("string")
	{
	json j = "Hello world";
	CHECK(j.type() == json::value_t::string);
	}

	SECTION("number (integer)")
	{
	json j = 23;
	CHECK(j.type() == json::value_t::number_integer);
	}

	SECTION("number (unsigned)")
	{
	json j = 23u;
	CHECK(j.type() == json::value_t::number_unsigned);
	}

	SECTION("number (floating-point)")
	{
	json j = 42.23;
	CHECK(j.type() == json::value_t::number_float);
	}
	}

	SECTION("return the type of the object (implicit)")
	{
	SECTION("null")
	{
	json j = nullptr;
	json::value_t t = j;
	CHECK(t == j.type());
	}

	SECTION("object")
	{
	json j = {{"foo", "bar"}};
	json::value_t t = j;
	CHECK(t == j.type());
	}

	SECTION("array")
	{
	json j = {1, 2, 3, 4};
	json::value_t t = j;
	CHECK(t == j.type());
	}

	SECTION("boolean")
	{
	json j = true;
	json::value_t t = j;
	CHECK(t == j.type());
	}

	SECTION("string")
	{
	json j = "Hello world";
	json::value_t t = j;
	CHECK(t == j.type());
	}

	SECTION("number (integer)")
	{
	json j = 23;
	json::value_t t = j;
	CHECK(t == j.type());
	}

	SECTION("number (unsigned)")
	{
	json j = 23u;
	json::value_t t = j;
	CHECK(t == j.type());
	}

	SECTION("number (floating-point)")
	{
	json j = 42.23;
	json::value_t t = j;
	CHECK(t == j.type());
	}

	SECTION("binary")
	{
	json j = json::binary({});
	json::value_t t = j;
	CHECK(t == j.type());
	}
	}
	}