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Add tests for error_handler_t::keep in dump() (#4555)

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Squashed onto develop from:
- Add error_handler_t::keep to copy invalid UTF-8 bytes unchanged
- Mention error_handler_t::keep in the README

Signed-off-by: Niels Lohmann <mail@nlohmann.me>
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Niels Lohmann authored and GitHub committed 2026-10-07 19:17:57 +02:00
1 parent e752688b52
commit 3c465beb61
7 files changed
+76 -4
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tests/src/unit-regression2.cpp
+9
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@@ -888,6 +888,15 @@ TEST_CASE("regression tests 2")
CHECK(j == k);
}
SECTION("issue #4552 - UTF-8 invalid characters are not always ignored when dumping with error_handler_t::ignore")
{
json node;
node["test"] = "test\334\005";
CHECK(node.dump(-1, ' ', false, json::error_handler_t::ignore) == "{\"test\":\"test\\u0005\"}");
CHECK(node.dump(-1, ' ', false, json::error_handler_t::keep) == "{\"test\":\"test\334\\u0005\"}");
CHECK(node.dump(-1, ' ', true, json::error_handler_t::keep) == "{\"test\":\"test\334\\u0005\"}");
}
#ifdef JSON_HAS_CPP_17
SECTION("issue #5066 - MSVC converts json to std::variant<json> via the conversion operator")
{