// Verify data offset is written correctly
            int dataOffsetValue = SMBUtil.readInt2(buffer, headerStart + 2);
            assertEquals(headerStart - 0 + 48, dataOffsetValue); // Assuming getHeaderStart() returns 0

            // Verify data is copied
            assertArrayEquals(data, Arrays.copyOfRange(buffer, headerStart + 48, headerStart + 48 + data.length));

            // Verify total bytes written

            this.retainPayload = retain;
        }

        public byte[] getRawPayload() {
            return rawPayload;
        }

        // Expose headerStart for testing
        public int getHeaderStart() {
            return headerStart;
        }
    }

    /**
     * Test implementation of SmbComNTCreateAndXResponse for testing
     */

            outputBufferLengthField.setAccessible(true);
            outputBufferLengthField.set(request, 0x4000);

            Method getHeaderStartMethod = ServerMessageBlock2.class.getDeclaredMethod("getHeaderStart");
            getHeaderStartMethod.setAccessible(true);

            // Create a buffer and write
            byte[] buffer = new byte[512];
            int bytesWritten = request.writeBytesWireFormat(buffer, 64);

     */
    private void setHeaderStart(Smb2ChangeNotifyResponse response, int headerStart) throws Exception {
        Method method = ServerMessageBlock2.class.getDeclaredMethod("getHeaderStart");
        method.setAccessible(true);

        Field field = ServerMessageBlock2.class.getDeclaredField("headerStart");
        field.setAccessible(true);
        field.setInt(response, headerStart);
    }

        return this.errorContextCount;
    }

    /**
     * Gets the header start position for this message.
     *
     * @return the headerStart
     */
    public final int getHeaderStart() {
        return this.headerStart;
    }

    /**
     * Gets the total length of this message.
     *
     * @return the length
     */
    public final int getLength() {

        @Test
        @DisplayName("Should get header start")
        void testGetHeaderStart() {
            assertEquals(0, testMessage.getHeaderStart());
            byte[] buffer = new byte[1024];
            testMessage.encode(buffer, 100);
            assertEquals(100, testMessage.getHeaderStart());
        }

        @Test
        @DisplayName("Should get length")
        void testGetLength() {