1 files changed, 48 insertions, 0 deletions
diff --git a/json4cpp/tests/src/unit-assert_macro.cpp b/json4cpp/tests/src/unit-assert_macro.cpp
new file mode 100644
index 0000000000..adedfc9344
--- /dev/null
+++ b/json4cpp/tests/src/unit-assert_macro.cpp
@@ -0,0 +1,48 @@
+//     __ _____ _____ _____
+//  __|  |   __|     |   | |  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"
+
+// avoid warning when assert does not abort
+DOCTEST_GCC_SUPPRESS_WARNING_PUSH
+DOCTEST_GCC_SUPPRESS_WARNING("-Wstrict-overflow")
+DOCTEST_CLANG_SUPPRESS_WARNING_PUSH
+DOCTEST_CLANG_SUPPRESS_WARNING("-Wstrict-overflow")
+
+/// global variable to record side effect of assert calls
+static int assert_counter;
+
+/// set failure variable to true instead of calling assert(x)
+#define JSON_ASSERT(x) {if (!(x)) ++assert_counter; }
+
+#include <nlohmann/json.hpp>
+using nlohmann::json;
+
+// the test assumes exceptions to work
+#if !defined(JSON_NOEXCEPTION)
+TEST_CASE("JSON_ASSERT(x)")
+{
+    SECTION("basic_json(first, second)")
+    {
+        assert_counter = 0;
+        CHECK(assert_counter == 0);
+
+        const json::iterator it{};
+        json j;
+
+        // in case assertions do not abort execution, an exception is thrown
+        CHECK_THROWS_WITH_AS(json(it, j.end()), "[json.exception.invalid_iterator.201] iterators are not compatible", json::invalid_iterator);
+
+        // check that assertion actually happened
+        CHECK(assert_counter == 1);
+    }
+}
+#endif
+
+DOCTEST_GCC_SUPPRESS_WARNING_POP
+DOCTEST_CLANG_SUPPRESS_WARNING_POP