@Test
    @DisplayName("writeULong writes little endian bytes")
    void testWriteULong() {
        byte[] dest = new byte[4];
        NtlmMessage.writeULong(dest, 0, 0x01020304);
        assertArrayEquals(new byte[] { 4, 3, 2, 1 }, dest, "Writer must be little‑endian");
    }

    @Test
    @DisplayName("writeULong handles negative values as unsigned")
    void testWriteULongNegative() {

            }
            final byte[] type1 = new byte[hostInfo ? 32 + domain.length + workstation.length : 16];
            System.arraycopy(NTLMSSP_SIGNATURE, 0, type1, 0, 8);
            writeULong(type1, 8, 1);
            writeULong(type1, 12, flags);
            if (hostInfo) {
                writeSecurityBuffer(type1, 16, 32, domain);
                writeSecurityBuffer(type1, 24, 32 + domain.length, workstation);
            }

        final int offset = readULong(src, index + 4);
        final byte[] buffer = new byte[length];
        System.arraycopy(src, offset, buffer, 0, length);
        return buffer;
    }

    static void writeULong(final byte[] dest, final int offset, final int ulong) {
        dest[offset] = (byte) (ulong & 0xff);
        dest[offset + 1] = (byte) (ulong >> 8 & 0xff);
        dest[offset + 2] = (byte) (ulong >> 16 & 0xff);

        final int offset = readULong(src, index + 4);
        final byte[] buffer = new byte[length];
        System.arraycopy(src, offset, buffer, 0, length);
        return buffer;
    }

    static void writeULong(final byte[] dest, final int offset, final int ulong) {
        dest[offset] = (byte) (ulong & 0xff);
        dest[offset + 1] = (byte) (ulong >> 8 & 0xff);
        dest[offset + 2] = (byte) (ulong >> 16 & 0xff);

            int pos = 0;

            System.arraycopy(NTLMSSP_SIGNATURE, 0, type1, 0, NTLMSSP_SIGNATURE.length);
            pos += NTLMSSP_SIGNATURE.length;

            writeULong(type1, pos, NTLMSSP_TYPE1);
            pos += 4;

            writeULong(type1, pos, flags);
            pos += 4;

            final int domOffOff = writeSecurityBuffer(type1, pos, domain);
            pos += 8;

  @Throws(IOException::class)
  fun writePing(payload: ByteString) {
    writeControlFrame(OPCODE_CONTROL_PING, payload)
  }

  /** Send a pong with the supplied [payload]. */
  @Throws(IOException::class)
  fun writePong(payload: ByteString) {
    writeControlFrame(OPCODE_CONTROL_PONG, payload)
  }

  /**
   * Send a close frame with optional code and reason.
   *
   * @param code Status code as defined by

        long MILLISECONDS_BETWEEN_1970_AND_1601 = 11644473600000L;
        writeLong(buffer, 0, (create + MILLISECONDS_BETWEEN_1970_AND_1601) * 10000L);
        writeLong(buffer, 8, (lastAccess + MILLISECONDS_BETWEEN_1970_AND_1601) * 10000L);
        writeLong(buffer, 16, (lastWrite + MILLISECONDS_BETWEEN_1970_AND_1601) * 10000L);
        writeLong(buffer, 24, (change + MILLISECONDS_BETWEEN_1970_AND_1601) * 10000L);

  }

  /**
   * Writes a {@code long} as specified by {@link DataOutputStream#writeLong(long)}, except using
   * little-endian byte order.
   *
   * @throws IOException if an I/O error occurs
   */
  @Override
  public void writeLong(long v) throws IOException {
    ((DataOutputStream) out).writeLong(Long.reverseBytes(v));
  }

  /**

            dos.writeInt(Integer.reverseBytes(10));
            dos.writeLong(Long.reverseBytes(100));

            dos.writeInt(Integer.reverseBytes(PacConstants.SERVER_CHECKSUM));
            dos.writeInt(Integer.reverseBytes(16));
            dos.writeLong(Long.reverseBytes(200));

            dos.writeInt(Integer.reverseBytes(PacConstants.PRIVSVR_CHECKSUM));

    assertData("898560b420bb28d14cd70f")
  }

  @Test fun serverEmptyPong() {
    serverWriter.writePong(EMPTY)
    assertData("8a00")
  }

  @Test fun clientEmptyPong() {
    clientWriter.writePong(EMPTY)
    assertData("8a8060b420bb")
  }

  @Test fun serverPongWithPayload() {
    serverWriter.writePong("Hello".encodeUtf8())
    assertData("8a0548656c6c6f")
  }

  @Test fun clientPongWithPayload() {