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Test json_document and json_view

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unit-json_view.cpp: type queries, size, and empty against basic_json;
materialize() against parse() (json and ordered_json, generated documents,
duplicate keys, 100,000 levels of nesting, parent pointers with
JSON_DIAGNOSTICS); parse errors and their messages equal to parse() for
malformed inputs and all option combinations; the overflow of a float
document (1e39, 3.4028236e38) as in parse(); NUL and BOM; borrowed and
owned inputs (strings, C strings, literals, vectors, string_view, streams,
wide strings, parse_copy, and iterator ranges over pointers, vectors,
strings, and lists); reuse with read(); moves; shrink_to_fit() of the index
and of the decoded strings; source offsets.

unit-json_view_macros.cpp includes the header without
JSON_TEST_KEEP_MACROS, as users do: the view must not depend on the macros
json.hpp undefines, and must not leak its own.

Signed-off-by: Niels Lohmann <mail@nlohmann.me>
This commit is contained in:
Niels Lohmann
2026-09-30 15:07:17 +02:00
parent 34f1bff147
commit 15ebc12276
2 changed files with 446 additions and 0 deletions
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47
tests/src/unit-json_view_macros.cpp Normal file
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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"
// All other tests keep the library's macros (JSON_TEST_KEEP_MACROS). This one
// includes json_view.hpp as users do, so that json.hpp undefines its macros
// (JSON_HAS_CPP_17, JSON_STRICT_NUL_HANDLING, ...) before the view is compiled.
#undef JSON_TEST_KEEP_MACROS
#include <nlohmann/json_view.hpp>
#include <string>
#include <type_traits>
#if (defined(__cplusplus) && __cplusplus >= 201703L) || (defined(_MSVC_LANG) && _MSVC_LANG >= 201703L)
#include <string_view>
#define JSON_VIEW_TEST_HAS_STRING_VIEW 1
#else
#define JSON_VIEW_TEST_HAS_STRING_VIEW 0
#endif
// the view's own macros do not leak
#if defined(NLOHMANN_VIEW_LIKELY) || defined(NLOHMANN_VIEW_UNLIKELY) || defined(NLOHMANN_VIEW_ALWAYS_INLINE) || defined(NLOHMANN_VIEW_NOINLINE) \
|| defined(NLOHMANN_VIEW_NODISCARD) || defined(NLOHMANN_VIEW_THROW) || defined(NLOHMANN_VIEW_HAS_CPP_17) || defined(NLOHMANN_VIEW_LITTLE_ENDIAN) \
|| defined(NLOHMANN_VIEW_REPEAT16)
#error "json_view.hpp leaks a macro"
#endif
TEST_CASE("json_view without the library's macros")
{
// (this file also gets C++17 builds: it mentions JSON_HAS_CPP_17)
#if JSON_VIEW_TEST_HAS_STRING_VIEW
CHECK(std::is_same<nlohmann::json_view::string_view_t, std::string_view>::value);
#endif
const std::string text = "[1, 2.5, \"x\"]";
const nlohmann::json_document d = nlohmann::json_document::parse(text);
CHECK(d.root().size() == 3);
CHECK(d.root().materialize() == nlohmann::json::parse(text));
// the NUL handling of the library's configuration
const std::string with_nul("[1]\0x", 5);
CHECK(nlohmann::json_document::accept(with_nul) == nlohmann::json::accept(with_nul));
}