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Add test coverage for ordered_json/alt_json across binary formats and patch/diff/flatten APIs

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Closes a test-coverage gap from #5421: ordered_json (and the alt_string-based
basic_json specialization from unit-alt-string.cpp) were never round-tripped
through the binary formats (CBOR/MessagePack/UBJSON/BSON/BJData), nor through
flatten()/unflatten(), diff()/patch()/patch_inplace(), or merge_patch(). Also
adds a std::formatter<ordered_json> spot-check, mirroring the precedent set
by the format_as() ADL-deduction test.

Signed-off-by: Niels Lohmann <mail@nlohmann.me>
This commit is contained in:
Niels Lohmann
2026-09-05 20:53:09 +02:00
parent 09b6b6b5ba
commit 0236475eef
2 changed files with 502 additions and 0 deletions
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tests/src/unit-std-format.cpp
+13
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@@ -17,6 +17,7 @@
#include <nlohmann/json.hpp>
using json = nlohmann::json;
using ordered_json = nlohmann::ordered_json;
// JSON_HAS_CPP_20 (do not remove; see note at top of file)
#if JSON_HAS_STD_FORMAT
@@ -93,4 +94,16 @@ TEST_CASE("std::formatter<nlohmann::json>")
}
}
TEST_CASE("std::formatter<nlohmann::ordered_json>")
{
// spot-check a non-default basic_json instantiation, since the formatter
// is written against the generic NLOHMANN_BASIC_JSON_TPL_DECLARATION
// template and must actually instantiate (and behave correctly) for
// template arguments other than nlohmann::json
const ordered_json j = {{"foo", 1}, {"bar", {1, 2, 3}}};
CHECK(std::format("{}", j) == j.dump());
CHECK(std::format("{:#}", j) == j.dump(4));
CHECK(std::format("{:2}", j) == j.dump(2));
}
#endif