// Assert
        assertEquals(expectedFlags, queryPolicy.getFlags());
        // Binary check for individual flags
        assertEquals(0x03, queryPolicy.getFlags()); // 0x01 | 0x02 = 0x03
    }

    @Test
    void getOpnum_shouldReturnCorrectValue() {
        // Arrange
        short level = 1;

     */
    int DCERPC_RESERVED_1 = 0x08;
    /**
     * Supports concurrent multiplexing flag
     */
    int DCERPC_CONC_MPX = 0x10; /* supports concurrent multiplexing */
    /**
     * Did not execute flag - indicates request was not executed
     */
    int DCERPC_DID_NOT_EXECUTE = 0x20;
    /**
     * Maybe flag - indicates 'maybe' call semantics requested
     */
    int DCERPC_MAYBE = 0x40; /* `maybe' call semantics requested */

    // error classes
    /** Success status code */
    public static final int SUCCESS = 0;
    /** Name service error class */
    public static final int ERR_NAM_SRVC = 0x01;
    /** Session service error class */
    public static final int ERR_SSN_SRVC = 0x02;

    // name service error codes
    /** Format error in the name service */
    public static final int FMT_ERR = 0x1;
    /** Server error in the name service */

    private Smb2LeaseKey testKey;
    private int testState;

    @BeforeEach
    void setUp() {
        byte[] keyBytes = new byte[] { 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F, 0x10 };
        testKey = new Smb2LeaseKey(keyBytes);
        testState = Smb2LeaseState.SMB2_LEASE_READ_WRITE;
        leaseContext = new LeaseV1CreateContextRequest(testKey, testState);

    void testFileInformationClassConstants() {
        assertEquals(0x01, Smb2QueryDirectoryRequest.FILE_DIRECTORY_INFO);
        assertEquals(0x02, Smb2QueryDirectoryRequest.FILE_FULL_DIRECTORY_INFO);
        assertEquals(0x03, Smb2QueryDirectoryRequest.FILE_BOTH_DIRECTORY_INFO);
        assertEquals(0x0C, Smb2QueryDirectoryRequest.FILE_NAMES_INFO);

        }
    }

    /* --- flag handling -------------------------------- */
    @Test
    void testFlagSetAndUnset() {
        TestMessage m = new TestMessage();
        int FLAG_A = 0x01;
        int FLAG_B = 0x02;
        assertFalse(m.isFlagSet(FLAG_A));
        m.setFlag(FLAG_A);
        assertTrue(m.isFlagSet(FLAG_A));
        // unset correctly removes the flag
        m.unsetFlag(FLAG_A);

    void testRoundTrip() throws CIFSException {
        List<AvPair> originalPairs = new LinkedList<>();
        originalPairs.add(new AvFlags(0x12345678));
        originalPairs.add(new AvTimestamp(new byte[] { 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08 }));
        originalPairs.add(new AvTargetName("TESTNAME".getBytes()));
        originalPairs.add(new AvSingleHost(new byte[] { 0x11, 0x22, 0x33, 0x44 }));

        assertEquals(0x01, smbComOpenAndX.openFunction); // OPEN_FN_OPEN
    }

    /**
     * Test constructor with O_TRUNC flag.
     */
    @Test
    void testConstructor_TruncateOnly() {
        int flags = SmbFile.O_TRUNC;
        smbComOpenAndX = new SmbComOpenAndX(fileName, access, flags, andx);
        assertEquals(0x02, smbComOpenAndX.openFunction); // OPEN_FN_TRUNC
    }

    /**

        bufferIndex++;
        this.server.security = this.server.securityMode & 0x01;
        this.server.encryptedPasswords = (this.server.securityMode & 0x02) == 0x02;
        this.server.signaturesEnabled = (this.server.securityMode & 0x04) == 0x04;
        this.server.signaturesRequired = (this.server.securityMode & 0x08) == 0x08;
        this.server.smaxMpxCount = SMBUtil.readInt2(buffer, bufferIndex);
        bufferIndex += 2;

     * Test constructor with malformed data (too short).
     */
    @Test
    void testConstructorMalformedData() {
        // Prepare data (only 2 bytes, less than an int)
        byte[] data = new byte[] { 0x01, 0x02 };

        // Verify that PACDecodingException is thrown
        assertThrows(PACDecodingException.class, () -> {
            new PacSignature(data);
        });
    }

    /**