}

    @Nested
    @DisplayName("Edge Cases and Boundary Tests")
    class EdgeCasesTests {

        @Test
        @DisplayName("Should handle various result codes correctly")
        void testVariousResultCodes() throws Exception {
            // Test all known result codes
            int[] validCodes = { 0, 1, 2, 3 };
            String[] expectedMessages = { null, // 0 returns null (no exception)