engine.close();
    }

    // ===== Close Lifecycle Tests =====

    /**
     * Test that close() can be called multiple times without error
     */
    @Test
    public void test_close_idempotent() {
        final GroovyEngine engine = new GroovyEngine();
        engine.evaluate("return 1", new HashMap<>());
        engine.close();
        engine.close(); // second close should not throw
    }