verify(messageBlock).setDigest(digest);
        verify(messageBlock).getDigest();
    }

    @Test
    @DisplayName("Test setDigest with null value")
    void testSetDigestWithNull() {
        // Given
        doNothing().when(messageBlock).setDigest(null);
        when(messageBlock.getDigest()).thenReturn(null);

        // When
        messageBlock.setDigest(null);

     */
    private void setDigest(SMBSigningDigest digest) throws SmbException {
        if (this.transport.isSMB2()) {
            this.digest = digest;
        } else {
            this.transport.setDigest(digest);
        }
    }

    /**
     * @return the digest
     * @throws SmbException
     */
    public SMBSigningDigest getDigest() throws SmbException {

        public int encode(byte[] dst, int dstIndex) {
            return 0;
        }

        @Override
        public void setDigest(SMBSigningDigest digest) {
            this.digest = digest;
        }

        @Override
        public SMBSigningDigest getDigest() {
            return digest;
        }

        @Override
        public void setResponse(CommonServerMessageBlockResponse msg) {

        public void setCreditForTest(int credit) {
            setCredit(credit);
        }

        @Override
        public Smb2SigningDigest getDigest() {
            return digest;
        }

        public void setDigest(Smb2SigningDigest digest) {
            this.digest = digest;
        }

        @Override

        assertEquals(expectedEncodeLength, response.encode(dst, dstIndex));

        // Test digest methods
        doNothing().when(response).setDigest(digest);
        when(response.getDigest()).thenReturn(digest);
        response.setDigest(digest);
        assertEquals(digest, response.getDigest());

        // Test mid methods
        long mid = 123456L;
        doNothing().when(response).setMid(mid);

    /**
     * Sets the signing digest for this message.
     *
     * @param digest the signing digest to set
     */
    void setDigest(SMBSigningDigest digest);

    /**
     * Gets the signing digest for this message.
     *
     * @return the signing digest
     */
    SMBSigningDigest getDigest();

    /**
     * Gets the response associated with this message.
     *
     * @return the associated response
     */

        @Override
        public int encode(byte[] dst, int dstIndex) {
            return 0;
        }

        @Override
        public void setDigest(SMBSigningDigest digest) {
        }

        @Override
        public SMBSigningDigest getDigest() {
            return null;
        }

        @Override
        public CommonServerMessageBlockResponse getResponse() {
            return null;

     *
     * @see jcifs.internal.CommonServerMessageBlock#getDigest()
     */
    @Override
    public Smb2SigningDigest getDigest() {
        return this.digest;
    }

    /**
     *
     * {@inheritDoc}
     *
     * @see jcifs.internal.CommonServerMessageBlock#setDigest(jcifs.internal.SMBSigningDigest)
     */
    @Override
    public void setDigest(final SMBSigningDigest digest) {

            // Mock implementation
            return 0;
        }

        @Override
        public void setDigest(SMBSigningDigest digest) {
            this.digest = digest;
        }

        @Override
        public SMBSigningDigest getDigest() {
            return this.digest;
        }

        @Override
        public CommonServerMessageBlockResponse getResponse() {

        @DisplayName("Should verify signature when digest is present and successful")
        void testVerifySignatureSuccess() throws Exception {
            byte[] buffer = new byte[1024];
            echoResponse.setDigest(mockDigest);
            setStatus(echoResponse, NtStatus.NT_STATUS_SUCCESS);

            when(mockConfig.isRequireSecureNegotiate()).thenReturn(true);