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Reduce test compile times (spike)
Two changes roughly halve the CPU time needed to build the unit tests (clang 21: ~300 s -> ~150 s, GCC 16: ~750-820 s -> ~395-420 s, Debug): - Move the C++14/17/20-dependent tests into separate unit-<name>-cpp<N>.cpp files. A test file is built for every standard whose JSON_HAS_CPP_<N> macro it mentions, so far whole large files were rebuilt for C++14/17/20 because of a few #ifdef sections. The main files are now built for C++11 only; the ci_test_*_cxx<N> jobs still build every file for every standard. - Add the CMake option JSON_TestUnityBuild (ON by default, OFF with MinGW): compatible test files are compiled in batches as one translation unit so they share the template instantiations of the library. Each file keeps its own CTest test, which runs the batch executable filtered to that file's test cases. The binary-format tests form an explicit group; the rest is batched by JSON_TestUnityBatchSize. Fix the name clashes that merging files exposed, document the rules for test files in tests/README.md, and point CONTRIBUTING.md to it. Signed-off-by: Niels Lohmann <mail@nlohmann.me>
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// __ _____ _____ _____
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// __| | __| | | | JSON for Modern C++ (supporting code)
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// | | |__ | | | | | | version 3.12.0
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// |_____|_____|_____|_|___| https://github.com/nlohmann/json
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//
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// SPDX-FileCopyrightText: 2013-2026 Niels Lohmann <https://nlohmann.me>
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// SPDX-License-Identifier: MIT
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// This file contains the C++17-only part of unit-conversions2.cpp (conversions of
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// std::filesystem::path, std::u8string and std::optional). It is kept in a separate
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// translation unit so the (much larger) unit-conversions2.cpp is built for C++11 only and
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// not rebuilt for every C++ standard.
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#include "doctest_compatibility.h"
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#include <nlohmann/json.hpp>
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using nlohmann::json;
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// workaround for MSVC, which does not set __cplusplus to the language version (#464)
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#if (defined(__cplusplus) && __cplusplus >= 201703L) || (defined(_HAS_CXX17) && _HAS_CXX17 == 1) // fix for issue #464
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#define JSON_HAS_CPP_17
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#endif
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// NLOHMANN_JSON_SERIALIZE_ENUM uses a static std::pair
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DOCTEST_CLANG_SUPPRESS_WARNING_PUSH
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DOCTEST_CLANG_SUPPRESS_WARNING("-Wexit-time-destructors")
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#ifdef JSON_HAS_CPP_17
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#include <map>
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#include <stdexcept>
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#include <string>
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#include <string_view>
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#include <type_traits>
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#include <vector>
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#if __has_include(<optional>)
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#include <optional>
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#elif __has_include(<experimental/optional>)
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#include <experimental/optional>
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#endif
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#if JSON_HAS_FILESYSTEM || JSON_HAS_EXPERIMENTAL_FILESYSTEM
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TEST_CASE("std::filesystem::path")
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{
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SECTION("ascii")
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{
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json const j_string = "Path";
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auto p = j_string.template get<nlohmann::detail::std_fs::path>();
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json const j_path = p;
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CHECK(j_path.template get<std::string>() ==
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j_string.template get<std::string>());
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}
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SECTION("utf-8")
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{
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json const j_string = "P\xc4\x9b\xc5\xa1ina";
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auto p = j_string.template get<nlohmann::detail::std_fs::path>();
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json const j_path = p;
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CHECK(j_path.template get<std::string>() ==
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j_string.template get<std::string>());
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}
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}
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#endif
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// the ADL to_json overload for std::u8string only exists under the same guard
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// as std::filesystem::path support (it is otherwise only reached indirectly,
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// via std::filesystem::path::u8string()) -- mirror both #if conditions from
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// include/nlohmann/detail/conversions/to_json.hpp exactly
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#if JSON_HAS_FILESYSTEM || JSON_HAS_EXPERIMENTAL_FILESYSTEM
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#if defined(__cpp_lib_char8_t)
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TEST_CASE("std::u8string")
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{
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SECTION("ascii")
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{
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const std::u8string s = u8"Path";
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json const j = s;
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CHECK(j.template get<std::string>() == "Path");
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}
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SECTION("utf-8")
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{
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// use \u universal-character-names (rather than raw \x byte escapes
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// or literal non-ASCII source bytes) to compose the multi-byte UTF-8
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// encoding -- MSVC treats \x escapes used that way inside a u8
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// literal as a nonstandard extension (warning C5321), which some of
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// our CI configs promote to an error; \u is portable and produces
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// the exact same encoded bytes without depending on the source
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// file's encoding
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const std::u8string s = u8"P\u011B\u0161ina";
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json const j = s;
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CHECK(j.template get<std::string>() == "P\xc4\x9b\xc5\xa1ina");
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}
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}
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#endif
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#endif
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#if !defined(JSON_NOEXCEPTION)
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namespace
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{
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// a type whose to_json reports an error by throwing, used below to check that
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// converting a std::optional<T> to JSON propagates an exception thrown while
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// converting its contained value instead of calling std::terminate (#5642)
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struct throwing_to_json_type {};
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[[noreturn]] void to_json(json& /*unused*/, const throwing_to_json_type& /*unused*/)
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{
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throw std::runtime_error("cannot serialize throwing_to_json_type");
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}
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} // namespace
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#endif
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TEST_CASE("std::optional")
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{
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SECTION("null")
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{
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const json j_null;
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const std::optional<std::string> opt_null;
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CHECK(json(opt_null) == j_null);
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CHECK(j_null.get<std::optional<std::string>>() == std::nullopt);
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// Constructing std::optional<T> directly from JSON null throws because
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// std::optional's own converting constructor is chosen over basic_json's
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// operator T(). This is a language-level limitation (std::optional<T> is
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// constructible from T, and T is constructible from basic_json via the
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// operator); there is no SFINAE path that distinguishes "call from inside
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// std::optional's constructor" from "direct call". Use get<std::optional<T>>()
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// or get_to() instead for correct null handling. See #4864 and #5246.
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CHECK_THROWS_WITH_AS(std::optional<std::string>(j_null),
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"[json.exception.type_error.302] type must be string, but is null", json::type_error&);
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CHECK_THROWS_WITH_AS(std::optional<int>(j_null),
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"[json.exception.type_error.302] type must be number, but is null", json::type_error&);
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// Assignment goes through the same overload resolution as direct
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// construction, so it throws for the same reason. This relies on
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// basic_json's implicit conversion operator, so it only applies
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// when JSON_USE_IMPLICIT_CONVERSIONS is enabled (the default).
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#if JSON_USE_IMPLICIT_CONVERSIONS
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std::optional<std::string> opt_assign;
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CHECK_THROWS_WITH_AS(opt_assign = j_null,
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"[json.exception.type_error.302] type must be string, but is null", json::type_error&);
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#endif
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// get_to() is the correct way to obtain std::nullopt from a JSON null.
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std::optional<std::string> opt_get_to = "placeholder";
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j_null.get_to(opt_get_to);
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CHECK(opt_get_to == std::nullopt);
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}
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SECTION("string")
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{
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json j_string = "string";
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std::optional<std::string> opt_string = "string";
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CHECK(json(opt_string) == j_string);
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CHECK(std::optional<std::string>(j_string) == opt_string);
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// false positive: Infer attributes the destruction of the temporaries above to opt_string
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// @infer-ignore USE_AFTER_DELETE
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}
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SECTION("bool")
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{
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json j_bool = true;
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std::optional<bool> opt_bool = true;
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CHECK(json(opt_bool) == j_bool);
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CHECK(std::optional<bool>(j_bool) == opt_bool);
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}
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SECTION("number")
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{
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json j_number = 1;
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std::optional<int> opt_int = 1;
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CHECK(json(opt_int) == j_number);
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CHECK(j_number.get<std::optional<int>>() == opt_int);
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}
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SECTION("array")
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{
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json j_array = {1, 2, nullptr};
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std::vector<std::optional<int>> opt_array = {{1, 2, std::nullopt}};
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CHECK(json(opt_array) == j_array);
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CHECK(j_array.get<std::vector<std::optional<int>>>() == opt_array);
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}
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SECTION("object")
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{
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json j_object = {{"one", 1}, {"two", 2}, {"zero", nullptr}};
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std::map<std::string, std::optional<int>> opt_object {{"one", 1}, {"two", 2}, {"zero", std::nullopt}};
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CHECK(json(opt_object) == j_object);
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CHECK(std::map<std::string, std::optional<int>>(j_object) == opt_object);
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}
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#if !defined(JSON_NOEXCEPTION)
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SECTION("exception from contained value's to_json propagates (#5642)")
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{
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// to_json(BasicJsonType&, const std::optional<T>&) must not be
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// noexcept: it calls T's to_json, which may throw (a user-defined
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// to_json that reports an error, or std::bad_alloc for T =
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// std::string/vector/json). Before the fix, this called
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// std::terminate() instead of letting the exception propagate.
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const std::optional<throwing_to_json_type> opt = throwing_to_json_type{};
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CHECK_THROWS_WITH_AS(json(opt), "cannot serialize throwing_to_json_type", std::runtime_error&);
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// the conversion is noexcept exactly when converting the contained value is
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// (except with MSVC 2017, where it is never noexcept, see to_json.hpp)
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#if !defined(_MSC_VER) || defined(__clang__) || _MSC_VER >= 1920
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static_assert(!std::is_nothrow_constructible<json, const std::optional<throwing_to_json_type>&>::value);
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static_assert(std::is_nothrow_constructible<json, const std::optional<int>&>::value);
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#endif
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}
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#endif
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}
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DOCTEST_CLANG_SUPPRESS_WARNING_POP
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#endif
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