assertEquals(len, digest.lastLength);
    }

    @Test
    @DisplayName("writeAndXWireFormat without andx writes 0xFF and sentinel offset")
    void testWriteAndXWireFormatWithoutAndx() {
        DummyAndXBlock block = new DummyAndXBlock();
        byte[] buf = new byte[128];
        int n = block.writeAndXWireFormat(buf, 0);

        assertTrue(n > 0);

    /*
     * We overload this method from ServerMessageBlock because
     * we want writeAndXWireFormat to write the parameterWords
     * and bytes. This is so we can write batched smbs because
     * all but the first smb of the chaain do not have a header
     * and therefore we do not want to writeHeaderWireFormat. We
     * just recursivly call writeAndXWireFormat.
     */

    @Override
    int encode(final byte[] dst, int dstIndex) {

    /*
     * We overload this method from ServerMessageBlock because
     * we want writeAndXWireFormat to write the parameterWords
     * and bytes. This is so we can write batched smbs because
     * all but the first smb of the chaain do not have a header
     * and therefore we do not want to writeHeaderWireFormat. We
     * just recursivly call writeAndXWireFormat.
     */

    @Override

        assertNotNull(result);
        assertTrue(result.contains("andxCommand=0x42"));
        assertTrue(result.contains("andxOffset="));
    }

    @Test
    @DisplayName("Test writeAndXWireFormat with non-AndX andx command")
    void testWriteAndXWireFormatWithNonAndXCommand() {
        when(mockConfig.isUseBatching()).thenReturn(true);
        when(mockAndxCommand.getCommand()).thenReturn(0x42);