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diff --git a/json4cpp/tests/src/unit-constructor2.cpp b/json4cpp/tests/src/unit-constructor2.cpp
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index 0000000000..a2c7e19bfe
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+++ b/json4cpp/tests/src/unit-constructor2.cpp
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+//     __ _____ _____ _____
+//  __|  |   __|     |   | |  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"
+
+#include <nlohmann/json.hpp>
+using nlohmann::json;
+
+TEST_CASE("other constructors and destructor")
+{
+    SECTION("copy constructor")
+    {
+        SECTION("object")
+        {
+            const json j {{"foo", 1}, {"bar", false}};
+            json k(j); // NOLINT(performance-unnecessary-copy-initialization)
+            CHECK(j == k);
+        }
+
+        SECTION("array")
+        {
+            const json j {"foo", 1, 42.23, false};
+            json k(j); // NOLINT(performance-unnecessary-copy-initialization)
+            CHECK(j == k);
+        }
+
+        SECTION("null")
+        {
+            const json j(nullptr);
+            json k(j); // NOLINT(performance-unnecessary-copy-initialization)
+            CHECK(j == k);
+        }
+
+        SECTION("boolean")
+        {
+            const json j(true);
+            json k(j); // NOLINT(performance-unnecessary-copy-initialization)
+            CHECK(j == k);
+        }
+
+        SECTION("string")
+        {
+            const json j("Hello world");
+            json k(j); // NOLINT(performance-unnecessary-copy-initialization)
+            CHECK(j == k);
+        }
+
+        SECTION("number (integer)")
+        {
+            const json j(42);
+            json k(j); // NOLINT(performance-unnecessary-copy-initialization)
+            CHECK(j == k);
+        }
+
+        SECTION("number (unsigned)")
+        {
+            const  json j(42u);
+            json k(j); // NOLINT(performance-unnecessary-copy-initialization)
+            CHECK(j == k);
+        }
+
+        SECTION("number (floating-point)")
+        {
+            const json j(42.23);
+            json k(j); // NOLINT(performance-unnecessary-copy-initialization)
+            CHECK(j == k);
+        }
+
+        SECTION("binary")
+        {
+            const json j = json::binary({1, 2, 3});
+            json k(j); // NOLINT(performance-unnecessary-copy-initialization)
+            CHECK(j == k);
+        }
+    }
+
+    SECTION("move constructor")
+    {
+        json j {{"foo", "bar"}, {"baz", {1, 2, 3, 4}}, {"a", 42u}, {"b", 42.23}, {"c", nullptr}};
+        CHECK(j.type() == json::value_t::object);
+        const json k(std::move(j));
+        CHECK(k.type() == json::value_t::object);
+        CHECK(j.type() == json::value_t::null); // NOLINT: access after move is OK here
+    }
+
+    SECTION("copy assignment")
+    {
+        SECTION("object")
+        {
+            const json j {{"foo", 1}, {"bar", false}};
+            json k;
+            k = j;
+            CHECK(j == k);
+        }
+
+        SECTION("array")
+        {
+            const json j {"foo", 1, 42.23, false};
+            json k;
+            k = j;
+            CHECK(j == k);
+        }
+
+        SECTION("null")
+        {
+            const json j(nullptr);
+            json k;
+            k = j;
+            CHECK(j == k);
+        }
+
+        SECTION("boolean")
+        {
+            const json j(true);
+            json k;
+            k = j;
+            CHECK(j == k);
+        }
+
+        SECTION("string")
+        {
+            const json j("Hello world");
+            json k;
+            k = j;
+            CHECK(j == k);
+        }
+
+        SECTION("number (integer)")
+        {
+            const json j(42);
+            json k;
+            k = j;
+            CHECK(j == k);
+        }
+
+        SECTION("number (unsigned)")
+        {
+            const json j(42u);
+            json k;
+            k = j;
+            CHECK(j == k);
+        }
+
+        SECTION("number (floating-point)")
+        {
+            const json j(42.23);
+            json k;
+            k = j;
+            CHECK(j == k);
+        }
+
+        SECTION("binary")
+        {
+            const json j = json::binary({1, 2, 3});
+            json k;
+            k = j;
+            CHECK(j == k);
+        }
+    }
+
+    SECTION("destructor")
+    {
+        SECTION("object")
+        {
+            auto* j = new json {{"foo", 1}, {"bar", false}}; // NOLINT(cppcoreguidelines-owning-memory)
+            delete j; // NOLINT(cppcoreguidelines-owning-memory)
+        }
+
+        SECTION("array")
+        {
+            auto* j = new json {"foo", 1, 1u, false, 23.42}; // NOLINT(cppcoreguidelines-owning-memory)
+            delete j; // NOLINT(cppcoreguidelines-owning-memory)
+        }
+
+        SECTION("string")
+        {
+            auto* j = new json("Hello world"); // NOLINT(cppcoreguidelines-owning-memory)
+            delete j; // NOLINT(cppcoreguidelines-owning-memory)
+        }
+    }
+}