}

        @Test
        @DisplayName("encode should handle non-REQUEST ptype correctly")
        void testEncodeNonRequestPtype() throws NdrException {
            message.ptype = DcerpcConstants.RPC_PT_RESPONSE; // 2, not 0
            message.call_id = 1;

            when(mockBuffer.getIndex()).thenReturn(0).thenReturn(16).thenReturn(20);