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test: add direct coverage for the std::u8string to_json overload (#5423)

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The ADL to_json overload for std::basic_string<char8_t, ...> was only ever
reached indirectly, via std::filesystem::path::u8string(). Add a test that
constructs a json value directly from a std::u8string, gated the same way as
the overload itself (include/nlohmann/detail/conversions/to_json.hpp): behind
both the std::filesystem::path feature guard and __cpp_lib_char8_t, since the
overload only exists when both are satisfied.

Signed-off-by: Niels Lohmann <mail@nlohmann.me>
This commit is contained in:
Niels Lohmann
2026-09-05 21:10:04 +02:00
parent 291640bffe
commit 288a69b1d2
1 changed files with 27 additions and 0 deletions
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tests/src/unit-conversions.cpp
+27
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@@ -1761,6 +1761,33 @@ TEST_CASE("std::filesystem::path")
}
#endif
// the ADL to_json overload for std::u8string only exists under the same guard
// as std::filesystem::path support (it is otherwise only reached indirectly,
// via std::filesystem::path::u8string()) -- mirror both #if conditions from
// include/nlohmann/detail/conversions/to_json.hpp exactly
#if JSON_HAS_FILESYSTEM || JSON_HAS_EXPERIMENTAL_FILESYSTEM
#if defined(__cpp_lib_char8_t)
TEST_CASE("std::u8string")
{
SECTION("ascii")
{
const std::u8string s = u8"Path";
json const j = s;
CHECK(j.template get<std::string>() == "Path");
}
SECTION("utf-8")
{
const std::u8string s = u8"P\xc4\x9b\xc5\xa1ina";
json const j = s;
CHECK(j.template get<std::string>() == "P\xc4\x9b\xc5\xa1ina");
}
}
#endif
#endif
TEST_CASE("std::optional")
{
SECTION("null")