@Mock
    private CommonServerMessageBlock message;

    private byte[] testData;

    @BeforeEach
    void setUp() {
        MockitoAnnotations.openMocks(this);
        testData = new byte[] { 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08 };
    }

    @Test
    @DisplayName("Test sign method with valid parameters")
    void testSignWithValidParameters() {
        // Arrange
        int offset = 0;

        assertNotNull(hmac);
    }

    @Test
    void testEngineUpdateByte() {
        // Test engineUpdate(byte b)
        HMACT64 hmac = new HMACT64(TEST_KEY);
        hmac.engineUpdate((byte) 0x01);
        // No exception means success
    }

    @Test
    void testEngineUpdateByteArray() {
        // Test engineUpdate(byte[] input, int offset, int len)
        HMACT64 hmac = new HMACT64(TEST_KEY);

            lock = new Smb2Lock(100L, 200L, sharedWithFailImmediately);
            lock.encode(buffer, 0);

            assertEquals(0x11, SMBUtil.readInt4(buffer, 16));
        }
    }

    @Nested
    @DisplayName("Edge Cases and Boundary Tests")
    class EdgeCaseTests {

        @Test

    }

    @Test
    void testConstructorWithMalformedToken() {
        // Test that PACDecodingException is thrown for a malformed token
        byte[] malformedToken = new byte[] { 0x01, 0x02, 0x03 };
        PACDecodingException e = assertThrows(PACDecodingException.class, () -> new KerberosTicket(malformedToken, (byte) 0, keys));
        assertTrue(e.getMessage().startsWith("Malformed kerberos ticket"));
    }

     *      jcifs.internal.smb1.com.SmbComNTCreateAndXResponse)
     */
    @Override
    protected void customizeCreate(final SmbComNTCreateAndX request, final SmbComNTCreateAndXResponse response) {
        request.addFlags0(0x16);
        response.setExtended(true);
    }

    /**
     * {@inheritDoc}
     *
     * @see jcifs.smb.SmbFile#getType()
     */
    @Override
    public int getType() throws SmbException {

                dst[dstIndex + 2 * i + 2] = (byte) ((tmp[i] & 0x0F) + 0x41);
            }
            for (; i < 15; i++) {
                dst[dstIndex + 2 * i + 1] = (byte) 0x43;
                dst[dstIndex + 2 * i + 2] = (byte) 0x41;
            }
            dst[dstIndex + TYPE_OFFSET] = (byte) (((hexCode & 0xF0) >> 4) + 0x41);

        byte[] server = hex("0102030405060708");
        byte[] client = hex("DEADBEEFCAFEBABE");

        // Act
        byte[] a = NtlmUtil.getNTLM2Response(pwdHash, server, client);
        server[7] ^= 0x01; // mutate
        byte[] b = NtlmUtil.getNTLM2Response(pwdHash, server, client);

        // Assert
        assertEquals(24, a.length);

    static final int FILE_SYNCHRONOUS_IO_ALERT = 0x00000010;
    static final int FILE_SYNCHRONOUS_IO_NONALERT = 0x00000020;

    // security flags
    static final int SECURITY_CONTEXT_TRACKING = 0x01;
    static final int SECURITY_EFFECTIVE_ONLY = 0x02;

    private int rootDirectoryFid;

    private final int extFileAttributes;

    private final int shareAccess;

    private int createDisposition;

        when(this.mechContext.getFlags()).thenReturn(0x1234);
        when(this.mechContext.initSecContext(any(byte[].class), eq(0), eq(0))).thenReturn(new byte[] { 0x01, 0x02 });

        // Act: len==0 triggers initial token construction
        byte[] out = ctx.initSecContext(null, 0, 0);

        // Assert: returns a SPNEGO token (opaque here but non-null/non-empty)

            byte[] buffer1 = new byte[100];
            byte[] buffer2 = new byte[200];

            Arrays.fill(buffer1, (byte) 0x11);
            Arrays.fill(buffer2, (byte) 0x22);

            // First decode
            response.decode(buffer1, 0, 50);
            byte[] data1 = response.getData();