byte[] emptyData = new byte[8];

        PACDecodingException e = assertThrows(PACDecodingException.class, () -> new Pac(emptyData, keys));
        // Any PACDecodingException is acceptable for this test
        assertNotNull(e.getMessage());
    }

    @Test
    void testTooSmallPac() {
        // Test that PAC smaller than 8 bytes is rejected
        byte[] smallData = new byte[4];

     * @param buffer
     *            the transaction buffer to use
     */
    public void setBuffer(final byte[] buffer) {
        this.txn_buf = buffer;
    }

    /**
     * Releases and returns the transaction buffer
     * @return the txn_buf
     */
    public byte[] releaseBuffer() {
        final byte[] buf = this.txn_buf;
        this.txn_buf = null;
        return buf;
    }

    /**

     */
    @Override
    protected int writeBytesWireFormat(final byte[] dst, final int dstIndex) {
        return 0;
    }

    /**
     * {@inheritDoc}
     *
     * @see jcifs.internal.smb2.ServerMessageBlock2#readBytesWireFormat(byte[], int)
     */
    @Override

        }

        @Test
        @DisplayName("Should handle various file ID sizes")
        void testVariousFileIdSizes() {
            byte[] shortFileId = new byte[8];
            byte[] standardFileId = new byte[16];
            byte[] longFileId = new byte[32];

            assertDoesNotThrow(() -> request.setFileId(shortFileId));
            assertDoesNotThrow(() -> request.setFileId(standardFileId));

    void testReadULong() {
        byte[] a = new byte[] { (byte) 0x01, (byte) 0x02, (byte) 0x03, (byte) 0x04 };
        int result = NtlmMessage.readULong(a, 0);
        assertEquals(0x04030201, result, "ULong should be little‑endian");
    }

    @Test
    @DisplayName("readUShort correctly interprets little endian")
    void testReadUShort() {
        byte[] a = new byte[] { (byte) 0xAA, (byte) 0xBB };

    /**
     * Channel type for RDMA version 1 with invalidate
     */
    public static int SMB2_CHANNEL_RDMA_V1_INVALIDATE = 0x2;

    private byte[] fileId;
    private final byte[] outputBuffer;
    private final int outputBufferOffset;
    private byte padding;
    private byte readFlags;
    private int readLength;
    private long offset;
    private int minimumCount;
    private int channel;
    private int remainingBytes;

   * @since 8.0
   */
  public static final byte SP = 32;

  /**
   * Alternate name for {@link #SP}.
   *
   * @since 8.0
   */
  public static final byte SPACE = 32;

  /**
   * Delete: This character is used primarily to "erase" or "obliterate" erroneous or unwanted
   * characters in perforated tape.
   *
   * @since 8.0
   */
  public static final byte DEL = 127;

  /**

    void testReadLengthMaximum() {
        byte[] src = { (byte) 0x00, (byte) 0x01, (byte) 0xFF, (byte) 0xFF };
        int length = SessionServicePacket.readLength(src, 0);

        assertEquals(0x01FFFF, length);
    }

    @Test
    @DisplayName("readLength should handle zero length")
    void testReadLengthZero() {
        byte[] src = { (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x00 };

    private Configuration mockConfig;
    private CIFSContext mockContext;
    private SecureRandom mockRandom;
    private Smb2NegotiateRequest request;
    private byte[] testMachineId = new byte[16];
    private byte[] testSalt = new byte[32];

    @BeforeEach
    void setUp() {
        mockConfig = mock(Configuration.class);
        mockContext = mock(CIFSContext.class);
        mockRandom = mock(SecureRandom.class);

        byte[] dst = new byte[10];

        // When
        int bytesWritten = transCallNamedPipe.writeSetupWireFormat(dst, 0);

        // Then
        assertEquals(4, bytesWritten);
        assertEquals(SmbComTransaction.TRANS_CALL_NAMED_PIPE, dst[0]);
        assertEquals((byte) 0x00, dst[1]);
        assertEquals((byte) 0x00, dst[2]);
        assertEquals((byte) 0x00, dst[3]);
    }

    @Test