"Should return correct error message");
        }

        @Test
        @DisplayName("decode_out should handle zero secondary address length")
        void testDecodeOutZeroSecondaryAddr() throws Exception {
            // Given
            when(mockBuffer.dec_ndr_short()).thenReturn(512, 512, 0, 0, 0);
            when(mockBuffer.dec_ndr_long()).thenReturn(0);