Shamelessly copy Josiah

source/lib/json/tests/abi/config/default.cpp

@@ -0,0 +1,41 @@
+//     __ _____ _____ _____
+//  __|  |   __|     |   | |  JSON for Modern C++ (supporting code)
+// |  |  |__   |  |  | | | |  version 3.11.2
+// |_____|_____|_____|_|___|  https://github.com/nlohmann/json
+//
+// SPDX-FileCopyrightText: 2013-2022 Niels Lohmann <https://nlohmann.me>
+// SPDX-License-Identifier: MIT
+
+#include "doctest_compatibility.h"
+
+#include "config.hpp"
+
+#include <nlohmann/json_fwd.hpp>
+
+TEST_CASE("default namespace")
+{
+    // GCC 4.8 fails with regex_error
+#if !DOCTEST_GCC || DOCTEST_GCC >= DOCTEST_COMPILER(4, 9, 0)
+    SECTION("namespace matches expectation")
+    {
+        std::string expected = "nlohmann::json_abi";
+
+#if JSON_DIAGNOSTICS
+        expected += "_diag";
+#endif
+
+#if JSON_USE_LEGACY_DISCARDED_VALUE_COMPARISON
+        expected += "_ldvcmp";
+#endif
+
+        expected += "_v" STRINGIZE(NLOHMANN_JSON_VERSION_MAJOR);
+        expected += "_" STRINGIZE(NLOHMANN_JSON_VERSION_MINOR);
+        expected += "_" STRINGIZE(NLOHMANN_JSON_VERSION_PATCH) "::basic_json";
+
+        // fallback for Clang
+        const std::string ns{STRINGIZE(NLOHMANN_JSON_NAMESPACE) "::basic_json"};
+
+        CHECK(namespace_name<nlohmann::json>(ns) == expected);
+    }
+#endif
+}