m.flags = 0x05;
        m.alloc_hint = 0;
        NdrBuffer buf = new NdrBuffer(new byte[1024], 0);
        m.encode(buf);
        // decode back
        buf.setIndex(0);
        m.decode_header(buf);
        assertEquals(0, m.ptype);
    }

    @Test
    void testDecodeHeaderInvalidVersion() {
        NdrBuffer buf = new NdrBuffer(new byte[10], 0);
        buf.enc_ndr_small(4); // bad major

        @Override
        public void encode(NdrBuffer _dst) throws NdrException {
            _dst.align(4);
            _dst.enc_ndr_referent(this.entry_path, 1);

            if (this.entry_path != null) {
                _dst = _dst.deferred;
                _dst.enc_ndr_string(this.entry_path);

            }
        }

        @Override
        public void decode(NdrBuffer _src) throws NdrException {

        @Override
        public void encode(NdrBuffer _dst) throws NdrException {
            _dst.align(4);
            _dst.enc_ndr_referent(netname, 1);

            if (netname != null) {
                _dst = _dst.deferred;
                _dst.enc_ndr_string(netname);

            }
        }

        @Override
        public void decode(NdrBuffer _src) throws NdrException {
            _src.align(4);

            NdrShort ndrShort1 = new NdrShort(originalValue);

            // Create separate mocks for encoding and decoding to simulate real buffer
            NdrBuffer encodeBuffer = mock(NdrBuffer.class);
            NdrBuffer decodeBuffer = mock(NdrBuffer.class);
            when(decodeBuffer.dec_ndr_short()).thenReturn(originalValue);

            // When: Encoding then decoding
            ndrShort1.encode(encodeBuffer);

     */
    void wrap(NdrBuffer outgoing) throws DcerpcException;

    /**
     * Unwraps incoming DCERPC message data after security processing
     * @param incoming the buffer containing data to be unwrapped
     * @throws DcerpcException if the unwrapping operation fails
     */
    void unwrap(NdrBuffer incoming) throws DcerpcException;

        @Override
        public void encode(final NdrBuffer _dst) throws NdrException {
            _dst.align(4);
            _dst.enc_ndr_long(this.length);
            _dst.enc_ndr_short(this.impersonation_level);
            _dst.enc_ndr_small(this.context_mode);
            _dst.enc_ndr_small(this.effective_only);

        }

        @Override
        public void decode(final NdrBuffer _src) throws NdrException {

    }

    /**
     * Verify that encode invokes NdrBuffer.enc_ndr_short via a mocked
     * (spied) buffer.
     */
    @Test
    void encodeWithSpiedBufferCallsEncMethod() throws NdrException {
        NdrShort ns = new NdrShort(42);
        NdrBuffer spy = spy(new NdrBuffer(new byte[10], 0));
        ns.encode(spy);

            this.handle = handle;
        }

        @Override
        public void encode_in(final NdrBuffer _dst) throws NdrException {
            this.handle.encode(_dst);
        }

        @Override
        public void decode_out(final NdrBuffer _src) throws NdrException {
            this.retval = _src.dec_ndr_long();
        }
    }

    /**

            this.handle = handle;
        }

        @Override
        public void encode_in(final NdrBuffer _dst) throws NdrException {
            handle.encode(_dst);
        }

        @Override
        public void decode_out(final NdrBuffer _src) throws NdrException {
            retval = _src.dec_ndr_long();
        }
    }

    /**

        @Override
        public void encode(NdrBuffer _dst) throws NdrException {
            _dst.align(4);
            _dst.enc_ndr_referent(entry_path, 1);

            if (entry_path != null) {
                _dst = _dst.deferred;
                _dst.enc_ndr_string(entry_path);

            }
        }

        @Override
        public void decode(NdrBuffer _src) throws NdrException {
            _src.align(4);