assertTrue(e.getMessage().contains("PAC"));
    }

    // Test exception for missing buffers
    @Test
    void testConstructorMissingBuffers() throws IOException {
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        DataOutputStream dos = new DataOutputStream(baos);

        // Write header with no buffers
        dos.writeInt(Integer.reverseBytes(0));

#### Do-stuff-later pool

/**
 * Internal API for managing reusable buffers
 *
 * @author mbechler
 *
 * <p>This interface is intended for internal use.</p>
 */
public interface BufferCache {

    /**
     * Gets a buffer from the cache or creates a new one if the cache is empty.
     *
     * @return a buffer from the cache, or a new one
     */
    byte[] getBuffer();

    /**
     * Return a buffer to the cache
     *

        assertSame(a, first, "First get should return first cached buffer");
        assertSame(c, second, "Second get should return second cached buffer");
        assertNotSame(d, third, "Third get should allocate a new buffer (not the dropped one)");
        assertEquals(3, third.length, "Allocated buffer length matches configured maximum size");
    }

            byte[][] buffers = new byte[][] { new byte[8], new byte[8] };

            when(src.toString()).thenReturn("smb://src");
            when(dest.toString()).thenReturn("smb://dest");

            // Act + Assert
            SmbException ex =
                    assertThrows(SmbException.class, () -> SmbCopyUtil.copyFile(src, dest, buffers, 8, new WriterThread(), sh, dh));

        SMBUtil.writeInt2(8, buffer, 58); // Security buffer length

        // Add some dummy security data at offset 64 from start
        buffer[64] = (byte) 0x4E; // NTLMSSP signature start
        buffer[65] = (byte) 0x54;
        buffer[66] = (byte) 0x4C;
        buffer[67] = (byte) 0x4D;
        buffer[68] = (byte) 0x53;
        buffer[69] = (byte) 0x53;

            when(mockSmbPipeHandleInternal.recv(buf, 0, buf.length)).thenAnswer(invocation -> {
                byte[] buffer = invocation.getArgument(0);
                buffer[0] = 5; // Valid PDU version
                buffer[1] = 0; // Valid PDU type
                Encdec.enc_uint16le((short) 50, buffer, 8); // Fragment length
                return 30; // Initial bytes received
            });

    this.connectionType = mode.second

    if (connectionType == H2) {
      platform.assumeHttp2Support()
    }

    // Sockets on some platforms can have large buffers that mean writes do not block when
    // required. These socket factories explicitly set the buffer sizes on sockets created.
    server = MockWebServer()
    server.serverSocketFactory =
      object : DelegatingServerSocketFactory(ServerSocketFactory.getDefault()) {

   * Use this method to create a degenerate Okio Buffer where each byte is in a separate segment of
   * the internal list.
   */
  @JvmStatic
  fun fragmentBuffer(buffer: Buffer): Buffer {
    // Write each byte into a new buffer, then clone it so that the segments are shared.
    // Shared segments cannot be compacted so we'll get a long chain of short segments.
    val result = Buffer()
    while (!buffer.exhausted()) {
      val box = Buffer()

    // Create a payload which will overflow the normal payload byte size.
    val payload = Buffer()
    while (payload.completeSegmentByteCount() <= PAYLOAD_BYTE_MAX) {
      payload.writeByte('0'.code)
    }
    serverWriter.writeMessageFrame(OPCODE_BINARY, payload.snapshot())

    // Write directly to the unbuffered sink. This ensures it will become single frame.
    assertData("827e") // 'e' == 4-byte follow-up length.